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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale [1] $ 3,436,289 $ 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 3,436,289 3,945,943
Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure [Abstract]    
Trading assets 2,017 2,208
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 590 2,072
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | US Treasury Securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 0 999
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,652 1,568
Fair Value, Measurements, Recurring | 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 | Fair Value, Inputs, Level 2 | GNMA    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,080,584 2,128,531
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private-label    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 758 1,003
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FFELP asset backed securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 269,789 297,360
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt And Other Equity Securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 2,993 3,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities available for sale    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 3,436,289 3,945,943
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential loans held for sale    
Assets, Fair Value Disclosure [Abstract]    
Trading assets 137,655 64,321
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror, net    
Assets, Fair Value Disclosure [Abstract]    
Trading assets 100,376 52,796
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 17,586 52,653
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards    
Assets, Fair Value Disclosure [Abstract]    
Trading assets 3,153 721
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 2,823 675
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading assets 25,388 35,426
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 24,758 34,340
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit)    
Assets, Fair Value Disclosure [Abstract]    
Trading assets 13 109
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 13 109
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest rate lock commitments (mortgage)    
Assets, Fair Value Disclosure [Abstract]    
Trading assets 2,017 2,208
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)    
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 590 2,072
Designated as Hedging Instrument | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure [Abstract]    
Interest Rate Fair Value Hedge Asset at Fair Value 114 0
Liabilities, Fair Value Disclosure [Abstract]    
Interest Rate Fair Value Hedge Liability at Fair Value 0 40
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 143,009 295,252
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 21,791 0
GNMA | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 1,363,948 1,220,797
Obligations of state and political subdivisions (municipal securities)(a)    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale 553,418  
Obligations of state and political subdivisions (municipal securities)(a) | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure [Abstract]    
Investment securities available for sale $ 553,418 $ 0
[1]
(a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with a book value of $692 million from held to maturity to available for sale.