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Securities - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from sales of securities | $ 0 | $ 55,884,000 | $ 495,566,000
Net gains (losses) in earnings resulting from sale of securities |  | (499,000) | 15,712,000
Net unrealized gains (losses) recorded in comprehensive income |  | (100,000) | $ 15,300,000
Securities available for sale | 853,838,000 | 910,790,000 |
Pledged to Secure Advances |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities available for sale | $ 23,400,000 | $ 34,700,000 |
Minimum | U.S. Government and its Agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Holdings of securities as percentage of share holders' equity | 10.00% |  |

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