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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale |  | $ 4,332,015
Servicing Asset at Fair Value, Amount | $ 67,015 | 57,158
Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 116,132 | 122,957
Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 2,664,671 | 4,209,058
Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 4,796 | 30
Servicing Asset at Fair Value, Amount | 67,015 | 57,259
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 234 | 0
Fair Value, Inputs, Level 3 | Forward commitments (mortgage) |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 4,796 | 30
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 9 | 0
Derivatives (trading and other liabilities), fair value | 9 | 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Available-for-sale Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 116,132 | 122,957
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 5,025 | 4,810
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 168,978 | 177,325
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | US Government-sponsored Enterprises Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 5,845 | 6,580
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 2,973 | 2,994
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Available-for-sale Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 2,664,671 | 4,209,058
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential loans held for sale |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 91,582 | 136,638
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror, net |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 31,728 | 83,626
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 112,029 | 26,231
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 1,986 | 5,490
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 1,815 | 5,441
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 0 | 1,264
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 0 | 1,248
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Mortgage banking(a)(b) |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 0 | 2,617
Liabilities, Fair Value Disclosure [Abstract] |  |
Trading liabilities | 224 | 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments and Forward Commitments Total |  |
Assets, Fair Value Disclosure [Abstract] |  |
Trading assets | 4,796 | 2,647
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 19,786 | 350,623
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Related Securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 1,894,819 | 2,691,879
Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 126,760 | 166,799
Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Related Securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 58,909 | 67,780
US Treasury Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 116,132 | 122,957
US Treasury Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale |  | 122,957
Agency Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 14,200 | 14,897
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 372,401 | 400,457
US Government-sponsored Enterprises Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 5,845 |
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | 0 | 329,724
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt Securities, Available-for-sale | $ 0 | $ 329,724

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