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Fair Values of Assets and Liabilities (Summary of Balances of Assets and Liabilities Measured at Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 2,998,898 | $ 2,327,793 | $ 2,430,749 |
Equity securities with readily determinable fair value | 92,689 | 90,511 | 90,338 |
Loans held-for-investment | 57,984 |  | 51,916 |
MSRs | 199,146 | 147,571 | 124,316 | $ 92,081
U.S. Treasury |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 | 65,001 |
U.S. Government agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 49,637 | 52,507 | 81,526 |
Municipal Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 155,489 | 165,594 | 148,300 |
Measured at fair value on a recurring basis: |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities | 852 | 1,061 | 951 |
Equity securities with readily determinable fair value | 92,689 | 90,511 | 90,338 |
Mortgage loans held-for-sale | 606,545 | 817,912 | 1,260,193 |
Loans held-for-investment | 57,984 | 38,598 | 51,916 |
MSRs | 199,146 | 147,571 | 124,316 |
Nonqualified deferred compensation assets | 15,447 | 16,240 | 15,891 |
Derivative assets | 153,534 | 165,008 | 253,509 |
Total | 4,125,095 | 3,604,694 | 4,227,863 |
Derivative liabilities | 122,107 | 123,000 | 200,758 |
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 | 0 | 0 |
Equity securities with readily determinable fair value | 84,623 | 82,445 | 82,272 |
Mortgage loans held-for-sale | 0 | 0 | 0 |
Loans held-for-investment | 0 | 0 | 0 |
MSRs | 0 | 0 | 0 |
Nonqualified deferred compensation assets | 0 | 0 | 0 |
Derivative assets | 0 | 0 | 0 |
Total | 84,623 | 82,445 | 147,273 |
Derivative liabilities | 0 | 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 | 852 | 1,061 | 951 |
Equity securities with readily determinable fair value | 8,066 | 8,066 | 8,066 |
Mortgage loans held-for-sale | 606,545 | 817,912 | 1,260,193 |
Loans held-for-investment | 13,520 | 22,707 | 45,508 |
MSRs | 0 | 0 | 0 |
Nonqualified deferred compensation assets | 15,447 | 16,240 | 15,891 |
Derivative assets | 150,087 | 154,448 | 227,875 |
Total | 3,693,014 | 3,242,540 | 3,820,700 |
Derivative liabilities | 122,107 | 123,000 | 200,758 |
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 | 0 |
Equity securities with readily determinable fair value | 0 | 0 | 0 |
Mortgage loans held-for-sale | 0 | 0 | 0 |
Loans held-for-investment | 44,464 | 15,891 | 6,408 |
MSRs | 199,146 | 147,571 | 124,316 |
Nonqualified deferred compensation assets | 0 | 0 | 0 |
Derivative assets | 3,447 | 10,560 | 25,634 |
Total | 347,458 | 279,709 | 259,890 |
Derivative liabilities | 0 | 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 | 0 | 0 | 65,001 |
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 | 0 | 0 | 65,001 |
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 | 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 | 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 | 49,637 | 52,507 | 81,526 |
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 | 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 | 49,637 | 52,507 | 79,742 |
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 | 1,784 |
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 | 155,489 | 165,594 | 148,300 |
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 | 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 | 55,088 | 59,907 | 46,552 |
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 | 100,401 | 105,687 | 101,748 |
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 | 82,939 | 95,704 | 92,349 |
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 | 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 | 82,939 | 95,704 | 92,349 |
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 | 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 | 2,710,833 | 2,013,988 | 2,043,573 |
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 | 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 | 2,710,833 | 2,013,988 | 2,043,573 |
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 | $ 0 |

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