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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 | Dec. 31, 2023 USD ($) Security | Dec. 31, 2022 USD ($) Security
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Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (106) | $ (4,324)
Available-for-Sale Within One Year, Estimated Fair Value | $ 30,422 | $ 129,210
Available-for-Sale Within One Year, Number of Securities | Security | 14 | 49
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (102,077) | $ (120,697)
Available-for-Sale More than One Year, Estimated Fair Value | $ 747,988 | $ 719,787
Available-for-Sale More than One Year, Number of Securities | Security | 213 | 184
Available-for-Sale, Gross Unrealized Loss | $ (102,183) | $ (125,021)
Available-for-Sale, Estimated Fair Value | $ 778,410 | $ 848,997
Available-for-Sale, Number of Securities | Security | 227 | 233
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (57) | $ (414)
Available-for-Sale Within One Year, Estimated Fair Value | $ 21,024 | $ 33,812
Available-for-Sale Within One Year, Number of Securities | Security | 7 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (983) | $ (1,250)
Available-for-Sale More than One Year, Estimated Fair Value | $ 32,449 | $ 14,215
Available-for-Sale More than One Year, Number of Securities | Security | 11 | 4
Available-for-Sale, Gross Unrealized Loss | $ (1,040) | $ (1,664)
Available-for-Sale, Estimated Fair Value | $ 53,473 | $ 48,027
Available-for-Sale, Number of Securities | Security | 18 | 18
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (11) | $ (1,712)
Available-for-Sale Within One Year, Estimated Fair Value | $ 2,324 | $ 36,009
Available-for-Sale Within One Year, Number of Securities | Security | 5 | 18
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (62,686) | $ (73,789)
Available-for-Sale More than One Year, Estimated Fair Value | $ 411,417 | $ 424,302
Available-for-Sale More than One Year, Number of Securities | Security | 118 | 105
Available-for-Sale, Gross Unrealized Loss | $ (62,697) | $ (75,501)
Available-for-Sale, Estimated Fair Value | $ 413,741 | $ 460,311
Available-for-Sale, Number of Securities | Security | 123 | 123
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (84)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 4,069
Available-for-Sale Within One Year, Number of Securities | Security |  | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,982) | $ (10,423)
Available-for-Sale More than One Year, Estimated Fair Value | $ 47,991 | $ 47,221
Available-for-Sale More than One Year, Number of Securities | Security | 15 | 14
Available-for-Sale, Gross Unrealized Loss | $ (11,982) | $ (10,507)
Available-for-Sale, Estimated Fair Value | $ 47,991 | $ 51,290
Available-for-Sale, Number of Securities | Security | 15 | 15
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (38) | $ (1,011)
Available-for-Sale Within One Year, Estimated Fair Value | $ 7,074 | $ 23,606
Available-for-Sale Within One Year, Number of Securities | Security | 2 | 8
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (9,611) | $ (11,740)
Available-for-Sale More than One Year, Estimated Fair Value | $ 63,610 | $ 61,879
Available-for-Sale More than One Year, Number of Securities | Security | 24 | 20
Available-for-Sale, Gross Unrealized Loss | $ (9,649) | $ (12,751)
Available-for-Sale, Estimated Fair Value | $ 70,684 | $ 85,485
Available-for-Sale, Number of Securities | Security | 26 | 28
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (1,103)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 31,714
Available-for-Sale Within One Year, Number of Securities | Security |  | 8
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (7,590) | $ (10,736)
Available-for-Sale More than One Year, Estimated Fair Value | $ 124,625 | $ 106,785
Available-for-Sale More than One Year, Number of Securities | Security | 26 | 22
Available-for-Sale, Gross Unrealized Loss | $ (7,590) | $ (11,839)
Available-for-Sale, Estimated Fair Value | $ 124,625 | $ 138,499
Available-for-Sale, Number of Securities | Security | 26 | 30
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (49) | $ (3,910)
Available-for-Sale Within One Year, Estimated Fair Value | $ 9,398 | $ 95,398
Available-for-Sale Within One Year, Number of Securities | Security | 7 | 35
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (91,869) | $ (106,688)
Available-for-Sale More than One Year, Estimated Fair Value | $ 647,643 | $ 640,187
Available-for-Sale More than One Year, Number of Securities | Security | 183 | 161
Available-for-Sale, Gross Unrealized Loss | $ (91,918) | $ (110,598)
Available-for-Sale, Estimated Fair Value | $ 657,041 | $ 735,585
Available-for-Sale, Number of Securities | Security | 190 | 196
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (9,225) | $ (12,759)
Available-for-Sale More than One Year, Estimated Fair Value | $ 67,896 | $ 65,385
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (9,225) | $ (12,759)
Available-for-Sale, Estimated Fair Value | $ 67,896 | $ 65,385
Available-for-Sale, Number of Securities | Security | 19 | 19

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