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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 955,860 | $ 978,796
Gross Unrealized Gain | 10 | 63
Gross Unrealized Loss | (119,220) | (125,021)
Estimated Fair Value | 836,650 | 853,838
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 58,179 | 49,690
Gross Unrealized Loss | (1,695) | (1,664)
Estimated Fair Value | 56,484 | 48,026
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 515,747 | 540,590
Gross Unrealized Gain | 1 | 63
Gross Unrealized Loss | (71,880) | (75,501)
Estimated Fair Value | 443,868 | 465,152
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 60,792 | 61,799
Gross Unrealized Loss | (12,014) | (10,507)
Estimated Fair Value | 48,778 | 51,292
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 98,122 | 98,236
Gross Unrealized Gain | 9 |
Gross Unrealized Loss | (11,326) | (12,751)
Estimated Fair Value | 86,805 | 85,485
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 145,386 | 150,338
Gross Unrealized Loss | (11,010) | (11,839)
Estimated Fair Value | 134,376 | 138,499
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 820,047 | 850,963
Gross Unrealized Gain | 10 | 63
Gross Unrealized Loss | (106,230) | (110,598)
Estimated Fair Value | 713,827 | 740,428
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 77,634 | 78,143
Gross Unrealized Loss | (11,295) | (12,759)
Estimated Fair Value | $ 66,339 | $ 65,384

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