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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, 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 | $ (515) | $ (106)
Available-for-Sale Within One Year, Estimated Fair Value | $ 98,971 | $ 30,422
Available-for-Sale Within One Year, Number of Securities | Security | 31 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (106,229) | $ (102,077)
Available-for-Sale More than One Year, Estimated Fair Value | $ 729,401 | $ 747,988
Available-for-Sale More than One Year, Number of Securities | Security | 214 | 213
Available-for-Sale, Gross Unrealized Loss | $ (106,744) | $ (102,183)
Available-for-Sale, Estimated Fair Value | $ 828,372 | $ 778,410
Available-for-Sale, Number of Securities | Security | 245 | 227
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (159) | $ (57)
Available-for-Sale Within One Year, Estimated Fair Value | $ 43,837 | $ 21,024
Available-for-Sale Within One Year, Number of Securities | Security | 13 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (965) | $ (983)
Available-for-Sale More than One Year, Estimated Fair Value | $ 31,489 | $ 32,449
Available-for-Sale More than One Year, Number of Securities | Security | 11 | 11
Available-for-Sale, Gross Unrealized Loss | $ (1,124) | $ (1,040)
Available-for-Sale, Estimated Fair Value | $ 75,326 | $ 53,473
Available-for-Sale, Number of Securities | Security | 24 | 18
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (88) | $ (11)
Available-for-Sale Within One Year, Estimated Fair Value | $ 16,344 | $ 2,324
Available-for-Sale Within One Year, Number of Securities | Security | 8 | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (65,179) | $ (62,686)
Available-for-Sale More than One Year, Estimated Fair Value | $ 395,536 | $ 411,417
Available-for-Sale More than One Year, Number of Securities | Security | 118 | 118
Available-for-Sale, Gross Unrealized Loss | $ (65,267) | $ (62,697)
Available-for-Sale, Estimated Fair Value | $ 411,880 | $ 413,741
Available-for-Sale, Number of Securities | Security | 126 | 123
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (12,383) | $ (11,982)
Available-for-Sale More than One Year, Estimated Fair Value | $ 47,220 | $ 47,991
Available-for-Sale More than One Year, Number of Securities | Security | 15 | 15
Available-for-Sale, Gross Unrealized Loss | $ (12,383) | $ (11,982)
Available-for-Sale, Estimated Fair Value | $ 47,220 | $ 47,991
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 | $ (268) | $ (38)
Available-for-Sale Within One Year, Estimated Fair Value | $ 38,790 | $ 7,074
Available-for-Sale Within One Year, Number of Securities | Security | 10 | 2
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (9,860) | $ (9,611)
Available-for-Sale More than One Year, Estimated Fair Value | $ 63,898 | $ 63,610
Available-for-Sale More than One Year, Number of Securities | Security | 25 | 24
Available-for-Sale, Gross Unrealized Loss | $ (10,128) | $ (9,649)
Available-for-Sale, Estimated Fair Value | $ 102,688 | $ 70,684
Available-for-Sale, Number of Securities | Security | 35 | 26
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (7,420) | $ (7,590)
Available-for-Sale More than One Year, Estimated Fair Value | $ 124,816 | $ 124,625
Available-for-Sale More than One Year, Number of Securities | Security | 26 | 26
Available-for-Sale, Gross Unrealized Loss | $ (7,420) | $ (7,590)
Available-for-Sale, Estimated Fair Value | $ 124,816 | $ 124,625
Available-for-Sale, Number of Securities | Security | 26 | 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 | $ (356) | $ (49)
Available-for-Sale Within One Year, Estimated Fair Value | $ 55,134 | $ 9,398
Available-for-Sale Within One Year, Number of Securities | Security | 18 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (94,842) | $ (91,869)
Available-for-Sale More than One Year, Estimated Fair Value | $ 631,470 | $ 647,643
Available-for-Sale More than One Year, Number of Securities | Security | 184 | 183
Available-for-Sale, Gross Unrealized Loss | $ (95,198) | $ (91,918)
Available-for-Sale, Estimated Fair Value | $ 686,604 | $ 657,041
Available-for-Sale, Number of Securities | Security | 202 | 190
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (10,422) | $ (9,225)
Available-for-Sale More than One Year, Estimated Fair Value | $ 66,442 | $ 67,896
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (10,422) | $ (9,225)
Available-for-Sale, Estimated Fair Value | $ 66,442 | $ 67,896
Available-for-Sale, Number of Securities | Security | 19 | 19

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