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, 2016
Aug. 16, 2016
Dec. 31, 2015
Assets measured at fair value on a recurring basis      
Loans held for investment $ 89,190 $ 56,000 $ 34,637
Consumer loans 89,190   0
Trading account securities 36,071   36,997
Available-for-sale and other securities 16,470,374   8,775,441
U.S. Treasury      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 6,509   5,472
Federal agencies: Mortgage-backed securities      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 10,880,880   4,521,688
Federal agencies, Other agencies      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 125,771   115,913
Municipal securities      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 3,311,161   2,456,396
Corporate debt      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 552,491   466,477
Recurring Basis      
Assets measured at fair value on a recurring basis      
Loans held for sale 517,591   337,577
Trading account securities 36,071   36,997
Available-for-sale and other securities 15,978,294   8,442,655
MSRs 12,428   17,585
Derivative assets netting (172,666)   (161,297)
Net amounts of assets presented in the condensed consolidated balance sheets 428,133   274,872
Liabilities measured at fair value on a recurring basis      
Gross amounts offset in the condensed consolidated balance sheets (278,458)   (144,309)
Derivative liabilities 114,238   144,350
Short-term borrowings 822   1,770
Recurring Basis | U.S. Treasury      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 6,509   5,472
Recurring Basis | Federal agencies: Mortgage-backed securities      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 10,880,880   4,521,688
Recurring Basis | Federal agencies, Other agencies      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 125,771   115,913
Recurring Basis | Municipal securities      
Assets measured at fair value on a recurring basis      
Trading account securities 2,854   4,159
Available-for-sale and other securities 3,311,161   2,456,396
Recurring Basis | Asset-backed Securities      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 1,081,182   861,413
Recurring Basis | Corporate debt      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 552,491   466,477
Recurring Basis | Other Debt Obligations [Member]      
Assets measured at fair value on a recurring basis      
Trading account securities 33,217   32,838
Available-for-sale and other securities 20,300   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 32,074   32,475
Available-for-sale and other securities 22,862   16,869
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 822   0
Recurring Basis | Level 1 | U.S. Treasury      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 6,509   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 32,074   32,475
Available-for-sale and other securities 16,353   11,397
Recurring Basis | Level 2      
Assets measured at fair value on a recurring basis      
Loans held for sale 517,591   337,577
Loans held for investment 35,905   32,889
Trading account securities 3,997   4,522
Available-for-sale and other securities 12,976,340   6,229,898
MSRs 0   0
Gross amounts of recognized assets 585,316   429,448
Liabilities measured at fair value on a recurring basis      
Gross amounts of recognized liabilities 385,813   287,994
Short-term borrowings 0   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 10,880,880   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 125,771   115,913
Recurring Basis | Level 2 | Municipal securities      
Assets measured at fair value on a recurring basis      
Trading account securities 2,854   4,159
Available-for-sale and other securities 405,888   360,845
Recurring Basis | Level 2 | Asset-backed Securities      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 1,007,363   761,076
Recurring Basis | Level 2 | Corporate debt      
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 552,491   466,477
Recurring Basis | Level 2 | Other Debt Obligations [Member]      
Assets measured at fair value on a recurring basis      
Trading account securities 1,143   363
Available-for-sale and other securities 3,947   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 53,285    
Consumer loans 53,285   1,748
Trading account securities 0   0
Available-for-sale and other securities 2,979,092   2,195,888
MSRs 12,428   17,585
Gross amounts of recognized assets 15,483   6,721
Liabilities measured at fair value on a recurring basis      
Gross amounts of recognized liabilities 6,883   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 2,905,273   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 73,819   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