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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,004,563 | $ 967,031
Gross Unrealized Gain | 901 | 891
Gross Unrealized Loss | (99,666) | (102,183)
Estimated Fair Value | 905,798 | 865,739
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 89,208 | 86,355
Gross Unrealized Gain | 242 | 173
Gross Unrealized Loss | (521) | (1,040)
Estimated Fair Value | 88,929 | 85,488
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 453,993 | 504,544
Gross Unrealized Gain | 222 | 481
Gross Unrealized Loss | (61,643) | (62,697)
Estimated Fair Value | 392,572 | 442,328
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 75,947 | 59,973
Gross Unrealized Gain | 24 |
Gross Unrealized Loss | (13,055) | (11,982)
Estimated Fair Value | 62,916 | 47,991
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 182,553 | 106,823
Gross Unrealized Gain | 404 | 237
Gross Unrealized Loss | (9,401) | (9,649)
Estimated Fair Value | 173,556 | 97,411
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 126,776 | 132,215
Gross Unrealized Gain | 9 |
Gross Unrealized Loss | (3,969) | (7,590)
Estimated Fair Value | 122,816 | 124,625
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 839,269 | 803,555
Gross Unrealized Gain | 659 | 718
Gross Unrealized Loss | (88,068) | (91,918)
Estimated Fair Value | 751,860 | 712,355
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 76,086 | 77,121
Gross Unrealized Loss | (11,077) | (9,225)
Estimated Fair Value | $ 65,009 | $ 67,896

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