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Investment Securities - Maturity of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Investment Securities [Line Items] |  |  |
Due within 1 year, Amortized Cost |  | $ 5,001 |
Due after 1 but within 5 years, Amortized Cost |  | 8,881 |
Due after 5 but within 10 years, Amortized Cost |  | 28,610 |
Due after 10 years, Amortized Cost |  | 0 |
Debt securities gross, Amortized Cost |  | 42,492 |
Total debt securities, Amortized Cost |  | 898,702 | $ 1,045,579
Due within 1 year, Estimated Fair Value |  | 4,997 |
Due after 1 but within 5 years, Estimated Fair Value |  | 8,654 |
Due after 5 but within 10 years, Estimated Fair Value |  | 24,622 |
Due after 10 years, Estimated Fair Value |  | 0 |
Debt securities gross, Estimated Fair Value |  | 38,273 |
Debt Securities, Available-for-Sale |  | 762,661 | $ 1,041,380
Mortgage-Backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Total debt securities, Amortized Cost | [1] | 856,210 |
Debt Securities, Available-for-Sale | [1] | 724,388 |
US Government Agencies Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Total debt securities, Amortized Cost |  | 328,400 |
Debt Securities, Available-for-Sale |  | 275,400 |
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |  |
Investment Securities [Line Items] |  |  |
Total debt securities, Amortized Cost |  | 527,800 |
Debt Securities, Available-for-Sale |  | $ 449,000 |
[1] | Mortgage Backed Securities include an amortized cost of $328.4 million and a fair value of $275.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $527.8 million and a fair value of $449.0 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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