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Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Net Investment Income [Line Items] |  |
Due within one year, Amortized Cost | $ 4,998 |
Due within one year, Estimated Fair Value | 5,007 |
Due after one but within five years, Amortized Cost | 8,879 |
Due after one but within five years, Estimated Fair Value | 8,808 |
Due after five but within ten years, Amortized Cost | 28,669 |
Due after five but within ten years, Estimated Fair Value | 26,713 |
Due after ten years, Amortized Cost | 0 |
Due after ten years, Estimated Fair Value | 0 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 42,546 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 40,528 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 914,324 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 823,094 |
Amortized Cost | 956,870 | $ 1,045,579
Securities available for sale, at fair value | 863,622 | $ 1,041,380
Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 956,870 |
Securities available for sale, at fair value | 863,622 |
US Government Agencies Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 347,400 |
Securities available for sale, at fair value | 313,600 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 566,900 |
Securities available for sale, at fair value | $ 509,500 |

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