Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure $ 584,829 $ 438,224
Consumer loans 99,191 82,319
Trading account securities 88,488 133,295
Available-for-sale and other securities 15,453,061 15,562,837
Gross amounts of recognized assets 320,826 420,159
Derivative assets netting (154,562) (181,940)
Net amounts of assets presented in the condensed consolidated balance sheets 166,264 238,219
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 293,650 370,647
Gross amounts offset in the condensed consolidated balance sheets (234,526) (272,361)
Derivative liabilities 59,124 98,286
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 11,260 5,497
Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,639,750 10,673,342
Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 96,451 73,542
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 3,426,109 3,250,057
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 555,191 793,481
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 125,629 198,683
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 584,829 438,224
Trading account securities 88,488 133,295
Available-for-sale and other securities 14,870,042 15,015,133
MSRs 11,753 13,747
Derivative assets netting (154,562) (181,940)
Net amounts of assets presented in the condensed consolidated balance sheets 166,264 238,219
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (234,526) (272,361)
Derivative liabilities 59,124 98,286
Short-term borrowings 4 474
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 11,260 5,497
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,639,750 10,673,342
Fair Value, Measurements, Recurring | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 96,451 73,542
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 1,481 1,148
Available-for-sale and other securities 3,426,109 3,250,057
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 555,191 793,481
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 125,629 198,683
Fair Value, Measurements, Recurring | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 86,982 132,147
Available-for-sale and other securities 15,652 20,531
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 0 0
Trading account securities 87,007 132,147
Available-for-sale and other securities 22,977 22,085
MSRs 0 0
Gross amounts of recognized assets 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 0 0
Short-term borrowings 4 474
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Trading account securities 25  
Available-for-sale and other securities 11,260 5,497
Fair Value, Measurements, Recurring | Level 1 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 86,982 132,147
Available-for-sale and other securities 11,717 16,588
Fair Value, Measurements, Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 584,829 438,224
Consumer loans 58,708 34,439
Trading account securities 1,481 1,148
Available-for-sale and other securities 11,864,911 12,119,001
MSRs 0 0
Gross amounts of recognized assets 312,401 414,412
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 288,191 362,777
Short-term borrowings 0 0
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 2 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,639,750 10,673,342
Fair Value, Measurements, Recurring | Level 2 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 96,451 73,542
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 1,481 1,148
Available-for-sale and other securities 468,082 452,013
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 531,064 717,478
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 125,629 198,683
Fair Value, Measurements, Recurring | Level 2 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 3,935 3,943
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 40,483 47,880
Trading account securities 0 0
Available-for-sale and other securities 2,982,154 2,874,047
MSRs 11,753 13,747
Gross amounts of recognized assets 8,425 5,747
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 5,459 7,870
Short-term borrowings 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 2,958,027 2,798,044
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 24,127 76,003
Fair Value, Measurements, Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities $ 0 $ 0