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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 991,234 | $ 1,004,563
Gross Unrealized Gain | 2,127 | 901
Gross Unrealized Loss | (86,350) | (99,666)
Estimated Fair Value | 907,011 | 905,798
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 89,726 | 89,208
Gross Unrealized Gain | 281 | 242
Gross Unrealized Loss | (376) | (521)
Estimated Fair Value | 89,631 | 88,929
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 439,368 | 453,993
Gross Unrealized Gain | 471 | 222
Gross Unrealized Loss | (52,001) | (61,643)
Estimated Fair Value | 387,838 | 392,572
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 74,491 | 75,947
Gross Unrealized Gain | 92 | 24
Gross Unrealized Loss | (12,031) | (13,055)
Estimated Fair Value | 62,552 | 62,916
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 195,041 | 182,553
Gross Unrealized Gain | 1,271 | 404
Gross Unrealized Loss | (7,783) | (9,401)
Estimated Fair Value | 188,529 | 173,556
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 116,783 | 126,776
Gross Unrealized Gain | 12 | 9
Gross Unrealized Loss | (2,891) | (3,969)
Estimated Fair Value | 113,904 | 122,816
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 825,683 | 839,269
Gross Unrealized Gain | 1,846 | 659
Gross Unrealized Loss | (74,706) | (88,068)
Estimated Fair Value | 752,823 | 751,860
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 75,825 | 76,086
Gross Unrealized Loss | (11,268) | (11,077)
Estimated Fair Value | $ 64,557 | $ 65,009

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