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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale $ 3,262,586 $ 3,946,941
Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 0 999
Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 3,262,586 3,945,943
Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets 2,527 2,208
Liabilities, Fair Value Disclosure [Abstract]    
Net Amounts Presented on the Consolidated Balance Sheets 710 2,072
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | U.S. Treasury securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 0 999
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,646 1,568
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 0 999
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Private-label    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 0 1,003
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FFELP asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 263,693 297,360
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 3,000 3,000
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 3,262,586 3,945,943
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Total investment securities available for sale    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets 136,280 64,321
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Interest rate-related instruments(a)    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets 77,024 52,796
Liabilities, Fair Value Disclosure [Abstract]    
Net Amounts Presented on the Consolidated Balance Sheets 13,073 52,653
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards(a)    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets 4,226 721
Liabilities, Fair Value Disclosure [Abstract]    
Net Amounts Presented on the Consolidated Balance Sheets 4,048 675
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commodity contracts(a)    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets 20,528 35,426
Liabilities, Fair Value Disclosure [Abstract]    
Net Amounts Presented on the Consolidated Balance Sheets 19,624 34,340
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Purchased options (time deposit)    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets 0 109
Liabilities, Fair Value Disclosure [Abstract]    
Net Amounts Presented on the Consolidated Balance Sheets 0 109
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]    
Derivative Assets 2,527 2,208
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Forward commitments to sell residential mortgage loans    
Liabilities, Fair Value Disclosure [Abstract]    
Net Amounts Presented on the Consolidated Balance Sheets 710 2,072
Designated as hedging instruments | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Interest Rate Fair Value Hedge Liability at Fair Value 0 40
FNMA / FHLMC | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FNMA / FHLMC    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 132,660 295,252
FNMA / FHLMC | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 21,728 0
GNMA | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 985,139 2,128,531
GNMA | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,310,207 1,220,797
Obligations of state and political subdivisions (municipal securities)(a)    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 546,160  
Obligations of state and political subdivisions (municipal securities)(a) | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale $ 546,160 $ 0