Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan Purchases and Sales (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan Purchases and Sales (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     $ 336,715 $ 345,039
Portfolio loans sold or transferred     1,242,039 368,101
C&I        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     316,252 326,557
Portfolio loans sold or transferred     380,713 352,062
CRE        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     0 8,447
Automobile        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     764,540 0
Portfolio loans transferred to held-for-sale   $ 1,000,000    
Portfolio loans transferred to loans and leases $ 262,000      
Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     96,786 0
Residential Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     20,463 18,482
Portfolio loans sold or transferred     0 0
Other Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     $ 0 $ 7,592