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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale: |  |
Investment securities available for sale | $ 4,261,651 | $ 4,043,446
Trading assets | 132,919 | 69,675
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 131,612 | 67,660
Fair Value, Inputs, Level 1 |  |
Investment securities available for sale: |  |
Investment securities available for sale | 2,609 | 2,628
Fair Value, Inputs, Level 2 |  |
Investment securities available for sale: |  |
Investment securities available for sale | 4,259,042 | 4,040,818
Trading assets | 136,342 | 70,850
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 132,639 | 68,835
Fair Value, Inputs, Level 3 |  |
Investment securities available for sale: |  |
Trading assets | 3,287 | 1,538
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 919 | 313
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | US Treasury Securities |  |
Investment securities available for sale: |  |
Investment securities available for sale | 996 | 996
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities |  |
Investment securities available for sale: |  |
Investment securities available for sale | 1,613 | 1,632
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Total investment securities available for sale |  |
Investment securities available for sale: |  |
Investment securities available for sale | 2,609 | 2,628
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC |  |
Investment securities available for sale: |  |
Investment securities available for sale | 396,709 | 464,768
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA |  |
Investment securities available for sale: |  |
Investment securities available for sale | 2,210,189 | 1,913,350
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private Label |  |
Investment securities available for sale: |  |
Investment securities available for sale | 1,031 | 1,059
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA Commercial Mortgage-Related Securities |  |
Investment securities available for sale: |  |
Investment securities available for sale | 1,348,282 | 1,513,277
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Investment securities available for sale: |  |
Investment securities available for sale | 299,831 | 145,176
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt And Other Equity Securities |  |
Investment securities available for sale: |  |
Investment securities available for sale | 3,000 | 3,188
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities available for sale |  |
Investment securities available for sale: |  |
Investment securities available for sale | 4,259,042 | 4,040,818
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Loans Held For Sale Member |  |
Investment securities available for sale: |  |
Trading assets | 143,022 | 85,544
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror |  |
Investment securities available for sale: |  |
Trading assets | 62,708 | 28,494
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 62,141 | 28,035
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards |  |
Investment securities available for sale: |  |
Trading assets | 3,317 | 2,495
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 3,091 | 2,339
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts |  |
Investment securities available for sale: |  |
Trading assets | 66,894 | 38,686
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 66,380 | 37,286
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit) |  |
Investment securities available for sale: |  |
Trading assets | 1,027 | 1,175
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 1,027 | 1,175
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest rate lock commitments (mortgage) |  |
Investment securities available for sale: |  |
Trading assets | 3,287 | 1,538
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage) |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 919 | 313
Designated as Hedging Instrument |  |
Investment securities available for sale: |  |
Trading assets | 500,000 |
Designated as Hedging Instrument | Fair Value, Inputs, Level 2 |  |
Investment securities available for sale: |  |
Interest Rate Fair Value Hedge Derivative at Fair Value, Net | $ 2,396 | $ 0

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