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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 978,580 | $ 967,031
Gross Unrealized Gain | 354 | 891
Gross Unrealized Loss | (106,744) | (102,183)
Estimated Fair Value | 872,190 | 865,739
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 88,407 | 86,355
Gross Unrealized Gain | 21 | 173
Gross Unrealized Loss | (1,124) | (1,040)
Estimated Fair Value | 87,304 | 85,488
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 489,714 | 504,544
Gross Unrealized Gain | 226 | 481
Gross Unrealized Loss | (65,267) | (62,697)
Estimated Fair Value | 424,673 | 442,328
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 59,603 | 59,973
Gross Unrealized Loss | (12,383) | (11,982)
Estimated Fair Value | 47,220 | 47,991
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 131,756 | 106,823
Gross Unrealized Gain | 107 | 237
Gross Unrealized Loss | (10,128) | (9,649)
Estimated Fair Value | 121,735 | 97,411
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 132,236 | 132,215
Gross Unrealized Loss | (7,420) | (7,590)
Estimated Fair Value | 124,816 | 124,625
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 813,309 | 803,555
Gross Unrealized Gain | 333 | 718
Gross Unrealized Loss | (95,198) | (91,918)
Estimated Fair Value | 718,444 | 712,355
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 76,864 | 77,121
Gross Unrealized Loss | (10,422) | (9,225)
Estimated Fair Value | $ 66,442 | $ 67,896

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