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
Jun. 30, 2017
Dec. 31, 2016
Assets measured at fair value on a recurring basis    
Loans held for investment $ 103,741 $ 82,319
Consumer loans 103,741 82,319
Trading account securities 94,767 133,295
Available-for-sale and other securities 15,388,306 15,562,837
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,644 5,497
Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,624,055 10,673,342
Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 100,291 73,542
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 3,312,500 3,250,057
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 144,035 198,683
Recurring Basis    
Assets measured at fair value on a recurring basis    
Loans held for sale 654,087 438,224
Trading account securities 94,767 133,295
Available-for-sale and other securities 14,802,835 15,015,133
MSRs 12,528 13,747
Derivative assets netting (144,951) (181,940)
Net amounts of assets presented in the condensed consolidated balance sheets 190,012 238,219
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (212,487) (272,361)
Derivative liabilities 78,358 98,286
Short-term borrowings 4,580 474
Recurring Basis | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,644 5,497
Recurring Basis | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,624,055 10,673,342
Recurring Basis | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities 6,868  
Available-for-sale and other securities 100,291 73,542
Recurring Basis | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 323 1,148
Available-for-sale and other securities 3,312,500 3,250,057
Recurring Basis | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 594,799 793,481
Recurring Basis | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 144,035 198,683
Recurring Basis | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 87,576 132,147
Available-for-sale and other securities 16,511 20,531
Recurring Basis | Level 1    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Loans held for investment 0 0
Trading account securities 86,560 132,147
Available-for-sale and other securities 23,129 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 4,580 474
Recurring Basis | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,644 5,497
Recurring Basis | Level 1 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis | Level 1 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale and other securities 0 0
Recurring Basis | 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
Recurring Basis | Level 1 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis | Level 1 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 86,560 132,147
Available-for-sale and other securities 12,485 16,588
Recurring Basis | Level 2    
Assets measured at fair value on a recurring basis    
Loans held for sale 654,087 438,224
Loans held for investment 59,886 34,439
Trading account securities 8,207 1,148
Available-for-sale and other securities 11,865,124 12,119,001
MSRs 0 0
Gross amounts of recognized assets 325,736 414,412
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 284,796 362,777
Short-term borrowings 0 0
Recurring Basis | Level 2 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis | Level 2 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 10,624,055 10,673,342
Recurring Basis | Level 2 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities 6,868  
Available-for-sale and other securities 100,291 73,542
Recurring Basis | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 323 1,148
Available-for-sale and other securities 440,493 452,013
Recurring Basis | Level 2 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 552,224 717,478
Recurring Basis | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 144,035 198,683
Recurring Basis | Level 2 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 1,016 0
Available-for-sale and other securities 4,026 3,943
Recurring Basis | Level 3    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Consumer loans 43,855 47,880
Trading account securities 0 0
Available-for-sale and other securities 2,914,582 2,874,047
MSRs 12,528 13,747
Gross amounts of recognized assets 9,227 5,747
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 6,049 7,870
Short-term borrowings 0 0
Recurring Basis | Level 3 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis | Level 3 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis | Level 3 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale and other securities 0 0
Recurring Basis | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 2,872,007 2,798,044
Recurring Basis | Level 3 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 42,575 76,003
Recurring Basis | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis | 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