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
Mar. 31, 2017
Dec. 31, 2016
Assets measured at fair value on a recurring basis    
Loans held for investment $ 98,342 $ 82,319
Consumer loans 98,342 82,319
Trading account securities 97,785 133,295
Available-for-sale and other securities 16,173,605 15,562,837
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,890 5,497
Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 11,221,867 10,673,342
Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 89,843 73,542
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 3,317,154 3,250,057
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 198,681 198,683
Recurring Basis    
Assets measured at fair value on a recurring basis    
Loans held for sale 423,324 438,224
Trading account securities 97,785 133,295
Available-for-sale and other securities 15,620,977 15,015,133
MSRs 13,307 13,747
Derivative assets netting (173,603) (181,940)
Net amounts of assets presented in the condensed consolidated balance sheets 178,420 238,219
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (246,192) (272,361)
Derivative liabilities 83,552 98,286
Short-term borrowings 1,420 474
Recurring Basis | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,890 5,497
Recurring Basis | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 11,221,867 10,673,342
Recurring Basis | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 89,843 73,542
Recurring Basis | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 3,434 1,148
Available-for-sale and other securities 3,317,154 3,250,057
Recurring Basis | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 766,937 793,481
Recurring Basis | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 198,681 198,683
Recurring Basis | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 94,351 132,147
Available-for-sale and other securities 19,605 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 94,201 132,147
Available-for-sale and other securities 22,522 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 1,420 474
Recurring Basis | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,890 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    
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 94,201 132,147
Available-for-sale and other securities 15,632 16,588
Recurring Basis | Level 2    
Assets measured at fair value on a recurring basis    
Loans held for sale 423,324 438,224
Loans held for investment 54,123 34,439
Trading account securities 3,584 1,148
Available-for-sale and other securities 12,671,311 12,119,001
MSRs 0 0
Gross amounts of recognized assets 342,584 414,412
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 322,999 362,777
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 11,221,867 10,673,342
Recurring Basis | Level 2 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 89,843 73,542
Recurring Basis | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 3,434 1,148
Available-for-sale and other securities 449,502 452,013
Recurring Basis | Level 2 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 707,445 717,478
Recurring Basis | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 198,681 198,683
Recurring Basis | Level 2 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 150 0
Available-for-sale and other securities 3,973 3,943
Recurring Basis | Level 3    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Consumer loans 44,219 47,880
Trading account securities 0 0
Available-for-sale and other securities 2,927,144 2,874,047
MSRs 13,307 13,747
Gross amounts of recognized assets 9,439 5,747
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 6,745 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    
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 2,867,652 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 59,492 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