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Securities - Summary of Debt Securities Available for Sale in an Unrealized Loss Position for Which an Allowance for Credit Losses Has Not Been Recorded (Detail) $ in Thousands | Mar. 31, 2025 USD ($) Security | Dec. 31, 2024 USD ($) Security
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Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (399) | $ (1,447)
Available-for-Sale Within One Year, Estimated Fair Value | $ 52,090 | $ 144,646
Available-for-Sale Within One Year, Number of Securities | Security | 17 | 42
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (85,951) | $ (98,219)
Available-for-Sale More than One Year, Estimated Fair Value | $ 615,067 | $ 630,005
Available-for-Sale More than One Year, Number of Securities | Security | 192 | 195
Available-for-Sale, Gross Unrealized Loss | $ (86,350) | $ (99,666)
Available-for-Sale, Estimated Fair Value | $ 667,157 | $ 774,651
Available-for-Sale, Number of Securities | Security | 209 | 237
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (17) | $ (61)
Available-for-Sale Within One Year, Estimated Fair Value | $ 8,063 | $ 13,603
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 6
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (359) | $ (460)
Available-for-Sale More than One Year, Estimated Fair Value | $ 9,876 | $ 9,771
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 3
Available-for-Sale, Gross Unrealized Loss | $ (376) | $ (521)
Available-for-Sale, Estimated Fair Value | $ 17,939 | $ 23,374
Available-for-Sale, Number of Securities | Security | 6 | 9
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (102) | $ (271)
Available-for-Sale Within One Year, Estimated Fair Value | $ 8,788 | $ 23,276
Available-for-Sale Within One Year, Number of Securities | Security | 5 | 10
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (51,899) | $ (61,372)
Available-for-Sale More than One Year, Estimated Fair Value | $ 348,252 | $ 351,793
Available-for-Sale More than One Year, Number of Securities | Security | 114 | 114
Available-for-Sale, Gross Unrealized Loss | $ (52,001) | $ (61,643)
Available-for-Sale, Estimated Fair Value | $ 357,040 | $ 375,069
Available-for-Sale, Number of Securities | Security | 119 | 124
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (246) | $ (447)
Available-for-Sale Within One Year, Estimated Fair Value | 14,745 | $ 19,092
Available-for-Sale Within One Year, Number of Securities | Security |  | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | (11,785) | $ (12,608)
Available-for-Sale More than One Year, Estimated Fair Value | $ 41,463 | $ 41,817
Available-for-Sale More than One Year, Number of Securities | Security | 14 | 14
Available-for-Sale, Gross Unrealized Loss | $ (12,031) | $ (13,055)
Available-for-Sale, Estimated Fair Value | $ 56,208 | $ 60,909
Available-for-Sale, Number of Securities | Security | 18 | 19
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (34) | $ (645)
Available-for-Sale Within One Year, Estimated Fair Value | $ 20,494 | $ 76,963
Available-for-Sale Within One Year, Number of Securities | Security | 5 | 18
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (7,749) | $ (8,756)
Available-for-Sale More than One Year, Estimated Fair Value | $ 52,260 | $ 54,020
Available-for-Sale More than One Year, Number of Securities | Security | 23 | 24
Available-for-Sale, Gross Unrealized Loss | $ (7,783) | $ (9,401)
Available-for-Sale, Estimated Fair Value | $ 72,754 | $ 130,983
Available-for-Sale, Number of Securities | Security | 28 | 42
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (23)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 11,712
Available-for-Sale Within One Year, Number of Securities | Security |  | 3
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (2,891) | $ (3,946)
Available-for-Sale More than One Year, Estimated Fair Value | $ 98,658 | $ 107,595
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 21
Available-for-Sale, Gross Unrealized Loss | $ (2,891) | $ (3,969)
Available-for-Sale, Estimated Fair Value | $ 98,658 | $ 119,307
Available-for-Sale, Number of Securities | Security | 19 | 24
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (382) | $ (1,386)
Available-for-Sale Within One Year, Estimated Fair Value | $ 44,027 | $ 131,043
Available-for-Sale Within One Year, Number of Securities | Security | 14 | 36
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (74,324) | $ (86,682)
Available-for-Sale More than One Year, Estimated Fair Value | $ 540,633 | $ 555,225
Available-for-Sale More than One Year, Number of Securities | Security | 170 | 173
Available-for-Sale, Gross Unrealized Loss | $ (74,706) | $ (88,068)
Available-for-Sale, Estimated Fair Value | $ 584,660 | $ 686,268
Available-for-Sale, Number of Securities | Security | 184 | 209
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,268) | $ (11,077)
Available-for-Sale More than One Year, Estimated Fair Value | $ 64,558 | $ 65,009
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (11,268) | $ (11,077)
Available-for-Sale, Estimated Fair Value | $ 64,558 | $ 65,009
Available-for-Sale, Number of Securities | Security | 19 | 19

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