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, 2015
Dec. 31, 2014
Assets measured at fair value on a recurring basis    
Trading account securities $ 38,609 $ 42,191
Available-for-sale and other securities 11,094,868 9,384,670
Derivatives (77,557) (101,197)
Liabilities measured at fair value on a recurring basis    
Derivatives (27,330) (51,973)
Recurring Basis    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 393,473 354,888
Mortgages Held-to-maturity, Fair Value Disclosure 34,019 40,027
Trading account securities 38,609 42,191
Available-for-sale and other securities 10,762,450 9,053,111
Automobile loans 2,563 10,590
MSR's 18,065 22,786
Derivatives 451,584 352,642
Liabilities measured at fair value on a recurring basis    
Derivatives 289,677 284,255
Short-term borrowings 511 2,295
Recurring Basis | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 14,095 5,452
Recurring Basis | Federal agencies - mortgage backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,764,213 5,322,701
Recurring Basis | Other Federal Agencies    
Assets measured at fair value on a recurring basis    
Trading account securities 0 2,857
Available-for-sale and other securities 376,538 351,543
Recurring Basis | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 5,932 5,098
Available-for-sale and other securities 2,328,091 1,868,569
Recurring Basis | Mortgage-backed Securities, Issued by Private Enterprises    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 41,926
Recurring Basis | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 814,009 955,998
Recurring Basis | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 449,089 486,176
Recurring Basis | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 32,677 34,236
Available-for-sale and other securities 16,415 20,746
Recurring Basis | Level 1    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 0 0
Mortgages Held-to-maturity, Fair Value Disclosure 0 0
Trading account securities 32,500 33,121
Available-for-sale and other securities 26,596 22,882
Automobile loans 0 0
MSR's 0 0
Derivatives 0 0
Liabilities measured at fair value on a recurring basis    
Derivatives 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 14,095 5,452
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 | Other Federal Agencies    
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 | 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 | Mortgage-backed Securities, Issued by Private Enterprises    
Assets measured at fair value on a recurring basis    
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 securities    
Assets measured at fair value on a recurring basis    
Trading account securities 32,500 33,121
Available-for-sale and other securities 12,501 17,430
Recurring Basis | Level 2    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 393,473 354,888
Mortgages Held-to-maturity, Fair Value Disclosure 34,019 40,027
Trading account securities 6,109 9,070
Available-for-sale and other securities 8,684,126 7,499,434
Automobile loans 0 0
MSR's 0 0
Derivatives 520,802 449,775
Liabilities measured at fair value on a recurring basis    
Derivatives 316,452 335,524
Short-term borrowings 511 2,295
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 6,764,213 5,322,701
Recurring Basis | Level 2 | Other Federal Agencies    
Assets measured at fair value on a recurring basis    
Trading account securities 0 2,857
Available-for-sale and other securities 376,538 351,543
Recurring Basis | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 5,932 5,098
Available-for-sale and other securities 377,535 450,976
Recurring Basis | Level 2 | Mortgage-backed Securities, Issued by Private Enterprises    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 11,462
Recurring Basis | Level 2 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 712,837 873,260
Recurring Basis | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 449,089 486,176
Recurring Basis | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 177 1,115
Available-for-sale and other securities 3,914 3,316
Recurring Basis | Level 3    
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 0 0
Mortgages Held-to-maturity, Fair Value Disclosure 0 0
Trading account securities 0 0
Available-for-sale and other securities 2,051,728 1,530,795
Automobile loans 2,563 10,590
MSR's 18,065 22,786
Derivatives 8,339 4,064
Liabilities measured at fair value on a recurring basis    
Derivatives 555 704
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 | Other Federal Agencies    
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 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 1,950,556 1,417,593
Recurring Basis | Level 3 | Mortgage-backed Securities, Issued by Private Enterprises    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 30,464
Recurring Basis | Level 3 | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 101,172 82,738
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 securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities $ 0 $ 0