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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 | Sep. 30, 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 | $ (39) | $ (1,447)
Available-for-Sale Within One Year, Estimated Fair Value | $ 18,983 | $ 144,646
Available-for-Sale Within One Year, Number of Securities | Security | 6 | 42
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (70,566) | $ (98,219)
Available-for-Sale More than One Year, Estimated Fair Value | $ 584,173 | $ 630,005
Available-for-Sale More than One Year, Number of Securities | Security | 189 | 195
Available-for-Sale, Gross Unrealized Loss | $ (70,605) | $ (99,666)
Available-for-Sale, Estimated Fair Value | $ 603,156 | $ 774,651
Available-for-Sale, Number of Securities | Security | 195 | 237
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (8) | $ (61)
Available-for-Sale Within One Year, Estimated Fair Value | $ 10,024 | $ 13,603
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 6
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (226) | $ (460)
Available-for-Sale More than One Year, Estimated Fair Value | $ 10,285 | $ 9,771
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 3
Available-for-Sale, Gross Unrealized Loss | $ (234) | $ (521)
Available-for-Sale, Estimated Fair Value | $ 20,309 | $ 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 | $ (31) | $ (271)
Available-for-Sale Within One Year, Estimated Fair Value | $ 8,959 | $ 23,276
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 10
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (42,577) | $ (61,372)
Available-for-Sale More than One Year, Estimated Fair Value | $ 332,541 | $ 351,793
Available-for-Sale More than One Year, Number of Securities | Security | 114 | 114
Available-for-Sale, Gross Unrealized Loss | $ (42,608) | $ (61,643)
Available-for-Sale, Estimated Fair Value | $ 341,500 | $ 375,069
Available-for-Sale, Number of Securities | Security | 117 | 124
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (447)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 19,092
Available-for-Sale Within One Year, Number of Securities | Security |  | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,863) | $ (12,608)
Available-for-Sale More than One Year, Estimated Fair Value | $ 54,856 | $ 41,817
Available-for-Sale More than One Year, Number of Securities | Security | 16 | 14
Available-for-Sale, Gross Unrealized Loss | $ (11,863) | $ (13,055)
Available-for-Sale, Estimated Fair Value | $ 54,856 | $ 60,909
Available-for-Sale, Number of Securities | Security | 16 | 19
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (645)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 76,963
Available-for-Sale Within One Year, Number of Securities | Security |  | 18
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (6,446) | $ (8,756)
Available-for-Sale More than One Year, Estimated Fair Value | $ 53,588 | $ 54,020
Available-for-Sale More than One Year, Number of Securities | Security | 24 | 24
Available-for-Sale, Gross Unrealized Loss | $ (6,446) | $ (9,401)
Available-for-Sale, Estimated Fair Value | $ 53,588 | $ 130,983
Available-for-Sale, Number of Securities | Security | 24 | 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 | $ (1,558) | $ (3,946)
Available-for-Sale More than One Year, Estimated Fair Value | $ 65,498 | $ 107,595
Available-for-Sale More than One Year, Number of Securities | Security | 13 | 21
Available-for-Sale, Gross Unrealized Loss | $ (1,558) | $ (3,969)
Available-for-Sale, Estimated Fair Value | $ 65,498 | $ 119,307
Available-for-Sale, Number of Securities | Security | 13 | 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 | $ (31) | $ (1,386)
Available-for-Sale Within One Year, Estimated Fair Value | $ 8,959 | $ 131,043
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 36
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (62,444) | $ (86,682)
Available-for-Sale More than One Year, Estimated Fair Value | $ 506,483 | $ 555,225
Available-for-Sale More than One Year, Number of Securities | Security | 167 | 173
Available-for-Sale, Gross Unrealized Loss | $ (62,475) | $ (88,068)
Available-for-Sale, Estimated Fair Value | $ 515,442 | $ 686,268
Available-for-Sale, Number of Securities | Security | 170 | 209
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (7,896) | $ (11,077)
Available-for-Sale More than One Year, Estimated Fair Value | $ 67,405 | $ 65,009
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (7,896) | $ (11,077)
Available-for-Sale, Estimated Fair Value | $ 67,405 | $ 65,009
Available-for-Sale, Number of Securities | Security | 19 | 19

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