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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, 2024 USD ($) Security | Dec. 31, 2023 USD ($) Security
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Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (166) | $ (106)
Available-for-Sale Within One Year, Estimated Fair Value | $ 25,716 | $ 30,422
Available-for-Sale Within One Year, Number of Securities | Security | 7 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (81,001) | $ (102,077)
Available-for-Sale More than One Year, Estimated Fair Value | $ 681,443 | $ 747,988
Available-for-Sale More than One Year, Number of Securities | Security | 200 | 213
Available-for-Sale, Gross Unrealized Loss | $ (81,167) | $ (102,183)
Available-for-Sale, Estimated Fair Value | $ 707,159 | $ 778,410
Available-for-Sale, Number of Securities | Security | 207 | 227
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (4) | $ (57)
Available-for-Sale Within One Year, Estimated Fair Value | $ 2,036 | $ 21,024
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (472) | $ (983)
Available-for-Sale More than One Year, Estimated Fair Value | $ 20,756 | $ 32,449
Available-for-Sale More than One Year, Number of Securities | Security | 6 | 11
Available-for-Sale, Gross Unrealized Loss | $ (476) | $ (1,040)
Available-for-Sale, Estimated Fair Value | $ 22,792 | $ 53,473
Available-for-Sale, Number of Securities | Security | 7 | 18
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (11)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 2,324
Available-for-Sale Within One Year, Number of Securities | Security |  | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (48,928) | $ (62,686)
Available-for-Sale More than One Year, Estimated Fair Value | $ 378,056 | $ 411,417
Available-for-Sale More than One Year, Number of Securities | Security | 114 | 118
Available-for-Sale, Gross Unrealized Loss | $ (48,928) | $ (62,697)
Available-for-Sale, Estimated Fair Value | $ 378,056 | $ 413,741
Available-for-Sale, Number of Securities | Security | 114 | 123
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (134) |
Available-for-Sale Within One Year, Estimated Fair Value | $ 11,330 |
Available-for-Sale Within One Year, Number of Securities | Security | 3 |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (10,870) | $ (11,982)
Available-for-Sale More than One Year, Estimated Fair Value | $ 45,238 | $ 47,991
Available-for-Sale More than One Year, Number of Securities | Security | 15 | 15
Available-for-Sale, Gross Unrealized Loss | $ (11,004) | $ (11,982)
Available-for-Sale, Estimated Fair Value | $ 56,568 | $ 47,991
Available-for-Sale, Number of Securities | Security | 18 | 15
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (28) | $ (38)
Available-for-Sale Within One Year, Estimated Fair Value | $ 12,350 | $ 7,074
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 2
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (7,484) | $ (9,611)
Available-for-Sale More than One Year, Estimated Fair Value | $ 57,768 | $ 63,610
Available-for-Sale More than One Year, Number of Securities | Security | 24 | 24
Available-for-Sale, Gross Unrealized Loss | $ (7,512) | $ (9,649)
Available-for-Sale, Estimated Fair Value | $ 70,118 | $ 70,684
Available-for-Sale, Number of Securities | Security | 27 | 26
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (4,135) | $ (7,590)
Available-for-Sale More than One Year, Estimated Fair Value | $ 112,391 | $ 124,625
Available-for-Sale More than One Year, Number of Securities | Security | 22 | 26
Available-for-Sale, Gross Unrealized Loss | $ (4,135) | $ (7,590)
Available-for-Sale, Estimated Fair Value | $ 112,391 | $ 124,625
Available-for-Sale, Number of Securities | Security | 22 | 26
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (162) | $ (49)
Available-for-Sale Within One Year, Estimated Fair Value | $ 23,680 | $ 9,398
Available-for-Sale Within One Year, Number of Securities | Security | 6 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (71,417) | $ (91,869)
Available-for-Sale More than One Year, Estimated Fair Value | $ 593,453 | $ 647,643
Available-for-Sale More than One Year, Number of Securities | Security | 175 | 183
Available-for-Sale, Gross Unrealized Loss | $ (71,579) | $ (91,918)
Available-for-Sale, Estimated Fair Value | $ 617,133 | $ 657,041
Available-for-Sale, Number of Securities | Security | 181 | 190
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (9,112) | $ (9,225)
Available-for-Sale More than One Year, Estimated Fair Value | $ 67,234 | $ 67,896
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (9,112) | $ (9,225)
Available-for-Sale, Estimated Fair Value | $ 67,234 | $ 67,896
Available-for-Sale, Number of Securities | Security | 19 | 19

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