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, 2016
Dec. 31, 2015
Assets measured at fair value on a recurring basis    
Loans held for investment $ 38,113 $ 32,889
Trading account securities 45,924 36,997
Available-for-sale and other securities 9,319,381 8,775,441
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,307 5,472
Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 4,841,992 4,521,688
Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 114,496 115,913
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 2,633,756 2,456,396
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 536,661 466,477
Recurring Basis    
Assets measured at fair value on a recurring basis    
Loans held for sale 364,967 337,577
Trading account securities 45,924 36,997
Available-for-sale and other securities 8,985,921 8,442,655
Automobile loans 1,216 1,748
MSRs 14,819 17,585
Derivative assets netting (219,347) (161,297)
Derivatives assets 358,372 274,872
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (201,418) (144,309)
Derivative liabilities 137,481 144,350
Short-term borrowings 624 1,770
Recurring Basis | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,307 5,472
Recurring Basis | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 4,841,992 4,521,688
Recurring Basis | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 114,496 115,913
Recurring Basis | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 9,752 4,159
Available-for-sale and other securities 2,633,756 2,456,396
Recurring Basis | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 837,374 861,413
Recurring Basis | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 536,661 466,477
Recurring Basis | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 36,172 32,838
Available-for-sale and other securities 15,335 15,296
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 35,539 32,475
Available-for-sale and other securities 17,711 16,869
Automobile loans 0 0
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 0 0
Recurring Basis | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,307 5,472
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 35,539 32,475
Available-for-sale and other securities 11,404 11,397
Recurring Basis | Level 2    
Assets measured at fair value on a recurring basis    
Loans held for sale 364,967 337,577
Loans held for investment 38,113 32,889
Trading account securities 10,385 4,522
Available-for-sale and other securities 6,592,138 6,229,898
Automobile loans 0 0
MSRs 0 0
Gross amounts of recognized assets 566,637 429,448
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 338,164 287,994
Short-term borrowings 624 1,770
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 4,841,992 4,521,688
Recurring Basis | Level 2 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 114,496 115,913
Recurring Basis | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 9,752 4,159
Available-for-sale and other securities 352,013 360,845
Recurring Basis | Level 2 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 743,045 761,076
Recurring Basis | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 536,661 466,477
Recurring Basis | Level 2 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 633 363
Available-for-sale and other securities 3,931 3,899
Recurring Basis | Level 3    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Loans held for investment 0 0
Trading account securities 0 0
Available-for-sale and other securities 2,376,072 2,195,888
Automobile loans 1,216 1,748
MSRs 14,819 17,585
Gross amounts of recognized assets 11,082 6,721
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 735 665
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 2,281,743 2,095,551
Recurring Basis | Level 3 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 94,329 100,337
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