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Fair Value of Assets and Liabilities (Summary of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 3,243,017 | $ 2,327,793 |  |
Equity securities with readily determinable fair value | 110,365 | 90,511 |  |
Loans held-for-investment | 179,932 | 38,598 |  |
MSRs | 230,225 | 147,571 | $ 92,081 | $ 85,638
U.S. Treasury |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 14,948 | 0 |  |
U.S. government agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 74,222 | 52,507 |  |
Municipal securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 168,655 | 165,594 |  |
Measured at fair value on a recurring basis: |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities | 1,127 | 90,511 |  |
Equity securities with readily determinable fair value | 110,365 | 1,061 |  |
Mortgage loans held-for-sale | 299,935 | 817,912 |  |
Loans held-for-investment | 179,932 | 38,598 |  |
MSRs | 230,225 | 147,571 |  |
Nonqualified deferred compensations assets | 13,899 | 16,240 |  |
Derivative assets | 296,848 | 165,008 |  |
Total financial assets | 4,375,348 | 3,604,694 |  |
Derivative liabilities | 338,078 | 123,000 |  |
Measured at fair value on a recurring basis: | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities | 0 | 82,445 |  |
Equity securities with readily determinable fair value | 102,299 | 0 |  |
Mortgage loans held-for-sale | 0 | 0 |  |
Loans held-for-investment | 0 | 0 |  |
MSRs | 0 | 0 |  |
Nonqualified deferred compensations assets | 0 | 0 |  |
Derivative assets | 0 | 0 |  |
Total financial assets | 117,247 | 82,445 |  |
Derivative liabilities | 0 | 0 |  |
Measured at fair value on a recurring basis: | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities | 1,127 | 8,066 |  |
Equity securities with readily determinable fair value | 8,066 | 1,061 |  |
Mortgage loans held-for-sale | 251,280 | 817,912 |  |
Loans held-for-investment | 95,767 | 22,707 |  |
MSRs | 0 | 0 |  |
Nonqualified deferred compensations assets | 13,899 | 16,240 |  |
Derivative assets | 295,137 | 154,448 |  |
Total financial assets | 3,775,808 | 3,242,540 |  |
Derivative liabilities | 338,078 | 123,000 |  |
Measured at fair value on a recurring basis: | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities | 0 | 0 |  |
Equity securities with readily determinable fair value | 0 | 0 |  |
Mortgage loans held-for-sale | 48,655 | 0 |  |
Loans held-for-investment | 84,165 | 15,891 |  |
MSRs | 230,225 | 147,571 |  |
Nonqualified deferred compensations assets | 0 | 0 |  |
Derivative assets | 1,711 | 10,560 |  |
Total financial assets | 482,293 | 279,709 |  |
Derivative liabilities | 0 | 0 |  |
Measured at fair value on a recurring basis: | U.S. Treasury |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 14,948 | 0 |  |
Measured at fair value on a recurring basis: | U.S. Treasury | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 14,948 | 0 |  |
Measured at fair value on a recurring basis: | U.S. Treasury | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | U.S. Treasury | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | U.S. government agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 74,222 | 52,507 |  |
Measured at fair value on a recurring basis: | U.S. government agencies | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | U.S. government agencies | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 74,222 | 52,507 |  |
Measured at fair value on a recurring basis: | U.S. government agencies | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | Municipal securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 168,655 | 165,594 |  |
Measured at fair value on a recurring basis: | Municipal securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | Municipal securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 51,118 | 59,907 |  |
Measured at fair value on a recurring basis: | Municipal securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 117,537 | 105,687 |  |
Measured at fair value on a recurring basis: | Corporate notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 85,705 | 95,704 |  |
Measured at fair value on a recurring basis: | Corporate notes | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | Corporate notes | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 85,705 | 95,704 |  |
Measured at fair value on a recurring basis: | Corporate notes | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | Mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,899,487 | 2,013,988 |  |
Measured at fair value on a recurring basis: | Mortgage-backed | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Measured at fair value on a recurring basis: | Mortgage-backed | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,899,487 | 2,013,988 |  |
Measured at fair value on a recurring basis: | Mortgage-backed | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 0 | $ 0 |  |

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