Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES INVESTMENT SECURITIES AND OTHER SECURITIES - Securities Lending (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES INVESTMENT SECURITIES AND OTHER SECURITIES - Securities Lending (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
Investment Securities [Line Items]  
Document Period End Date Sep. 30, 2019
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement $ 0
Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Maturity Less than 30 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Maturity Greater than 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Collateralized Mortgage Obligations [Member] | Available-for-sale Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Collateralized Mortgage Obligations [Member] | Available-for-sale Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Collateralized Mortgage Obligations [Member] | Available-for-sale Securities [Member] | Maturity Less than 30 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Collateralized Mortgage Obligations [Member] | Held-to-maturity Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Collateralized Mortgage Obligations [Member] | Held-to-maturity Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Collateralized Mortgage Obligations [Member] | Held-to-maturity Securities [Member] | Maturity Less than 30 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Collateralized Mortgage Obligations [Member] | Held-to-maturity Securities [Member] | Maturity Greater than 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Maturity Less than 30 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Maturity Greater than 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Held-to-maturity Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Held-to-maturity Securities [Member] | Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Residential Mortgage Backed Securities [Member] | Held-to-maturity Securities [Member] | Maturity Greater than 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Commercial Mortgage Backed Securities [Member] | Held-to-maturity Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Commercial Mortgage Backed Securities [Member] | Held-to-maturity Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Available-for-sale Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Available-for-sale Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Available-for-sale Securities [Member] | Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Available-for-sale Securities [Member] | Maturity Greater than 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Held-to-maturity Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Held-to-maturity Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Held-to-maturity Securities [Member] | Maturity Less than 30 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
Other Federal Agencies [Member] | Held-to-maturity Securities [Member] | Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Available-for-sale Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Available-for-sale Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Available-for-sale Securities [Member] | Maturity Less than 30 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Available-for-sale Securities [Member] | Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Available-for-sale Securities [Member] | Maturity Greater than 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Held-to-maturity Securities [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Held-to-maturity Securities [Member] | Maturity Overnight and on Demand [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Held-to-maturity Securities [Member] | Maturity Less than 30 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Held-to-maturity Securities [Member] | Maturity 30 to 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement 0
US Government-sponsored Enterprises Debt Securities [Member] | Held-to-maturity Securities [Member] | Maturity Greater than 90 Days [Member]  
Investment Securities [Line Items]  
Securities Loaned, Gross Including Not Subject to Master Netting Arrangement $ 0