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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale $ 3,948,510 $ 4,043,446
Trading Assets 88,943 69,675
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 87,668 67,660
Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 2,567 2,628
Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 3,945,943 4,040,818
Trading Assets 89,052 70,850
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 87,817 68,835
Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 2,208 1,538
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 2,072 313
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | U.S. Treasury securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 999 996
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | Other securities (debt and equity)    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,568 1,632
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | Total investment securities available for sale    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 2,567 2,628
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FNMA / FHLMC    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 295,252 464,768
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | GNMA    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 2,128,531 1,913,350
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Private-label    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,003 1,059
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | GNMA commercial mortgage-related securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,220,797 1,513,277
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Federal Family Education Loan Program (FFELP) Guaranteed Loans    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 297,360 145,176
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Other securities (debt and equity)    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 3,000 3,188
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Total investment securities available for sale    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 3,945,943 4,040,818
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Residential Loans Held For Sale Member [Member]    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 64,321 85,544
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commercial loans held for sale [Domain]    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 14,943 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Interest rate-related instruments    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 52,796 28,494
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 52,653 28,035
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 721 2,495
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 675 2,339
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 35,426 38,686
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 34,340 37,286
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Purchased options (time deposit)    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 109 1,175
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 109 1,175
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Interest rate lock commitments to originate residential mortgage loans held for sale    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 2,208 1,538
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Forward commitments to sell residential mortgage loans    
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 2,072 313
Designated as Hedging Instrument [Member]    
Assets, Fair Value Disclosure [Abstract]    
Trading Assets 500,000  
Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Interest Rate Fair Value Hedge Asset at Fair Value $ 40 $ 0