Annual report pursuant to Section 13 and 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
Dec. 31, 2015
Dec. 31, 2014
Assets measured at fair value on a recurring basis    
Loans held for investment $ 32,889 $ 40,027
Trading account securities 36,997 42,191
Available-for-sale and other securities 8,775,441 9,384,670
Derivative assets netting (161,297) (101,197)
Liabilities measured at fair value on a recurring basis    
Derivative liabilities netting (144,309) (51,973)
U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 5,472 5,452
Federal agencies: Mortgage-backed    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 4,521,688 5,322,701
Federal agencies: Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 115,913 351,543
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 2,456,396 1,868,569
Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities   41,926
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 466,477 486,176
Recurring    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 337,577 354,888
Trading account securities 36,997 42,191
Available-for-sale and other securities 8,442,655 9,053,111
Automobile loans 1,748 10,590
MSRs 17,585 22,786
Derivative assets 274,872 352,642
Liabilities measured at fair value on a recurring basis    
Derivative liabilities 144,350 284,255
Short-term borrowings 1,770 2,295
Recurring | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 5,472 5,452
Recurring | Federal agencies: Mortgage-backed    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 4,521,688 5,322,701
Recurring | Federal agencies: Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities   2,857
Available-for-sale and other securities 115,913 351,543
Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 4,159 5,098
Available-for-sale and other securities 2,456,396 1,868,569
Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities   41,926
Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 861,413 955,998
Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 466,477 486,176
Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 32,838 34,236
Available-for-sale and other securities 15,296 20,746
Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 0 0
Loans held for investment 0 0
Trading account securities 32,475 33,121
Available-for-sale and other securities 16,869 22,882
Automobile loans 0 0
MSRs 0 0
Derivative assets gross 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 0 0
Short-term borrowings 0 0
Recurring | Level 1 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 5,472 5,452
Recurring | Level 1 | Federal agencies: Mortgage-backed    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | 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 | 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 | Level 1 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities   0
Recurring | Level 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 1 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 32,475 33,121
Available-for-sale and other securities 11,397 17,430
Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 337,577 354,888
Loans held for investment 32,889 40,027
Trading account securities 4,522 9,070
Available-for-sale and other securities 6,229,898 7,499,434
Automobile loans 0 0
MSRs 0 0
Derivative assets gross 429,448 449,775
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 287,994 335,524
Short-term borrowings 1,770 2,295
Recurring | Level 2 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 2 | Federal agencies: Mortgage-backed    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 4,521,688 5,322,701
Recurring | Level 2 | Federal agencies: Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities   2,857
Available-for-sale and other securities 115,913 351,543
Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 4,159 5,098
Available-for-sale and other securities 360,845 450,976
Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities   11,462
Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 761,076 873,260
Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 466,477 486,176
Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 363 1,115
Available-for-sale and other securities 3,899 3,316
Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 0 0
Loans held for investment 0 0
Trading account securities 0 0
Available-for-sale and other securities 2,195,888 1,530,795
Automobile loans 1,748 10,590
MSRs 17,585 22,786
Derivative assets gross 6,721 4,064
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 665 704
Short-term borrowings 0 0
Recurring | Level 3 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 3 | Federal agencies: Mortgage-backed    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | 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 | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 2,095,551 1,417,593
Recurring | Level 3 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities   30,464
Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 100,337 82,738
Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 3 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities $ 0 $ 0