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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, 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 | $ (1,447) | $ (106)
Available-for-Sale Within One Year, Estimated Fair Value | $ 144,646 | $ 30,422
Available-for-Sale Within One Year, Number of Securities | Security | 42 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (98,219) | $ (102,077)
Available-for-Sale More than One Year, Estimated Fair Value | $ 630,005 | $ 747,988
Available-for-Sale More than One Year, Number of Securities | Security | 195 | 213
Available-for-Sale, Gross Unrealized Loss | $ (99,666) | $ (102,183)
Available-for-Sale, Estimated Fair Value | $ 774,651 | $ 778,410
Available-for-Sale, Number of Securities | Security | 237 | 227
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (61) | $ (57)
Available-for-Sale Within One Year, Estimated Fair Value | $ 13,603 | $ 21,024
Available-for-Sale Within One Year, Number of Securities | Security | 6 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (460) | $ (983)
Available-for-Sale More than One Year, Estimated Fair Value | $ 9,771 | $ 32,449
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 11
Available-for-Sale, Gross Unrealized Loss | $ (521) | $ (1,040)
Available-for-Sale, Estimated Fair Value | $ 23,374 | $ 53,473
Available-for-Sale, Number of Securities | Security | 9 | 18
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (271) | $ (11)
Available-for-Sale Within One Year, Estimated Fair Value | $ 23,276 | $ 2,324
Available-for-Sale Within One Year, Number of Securities | Security | 10 | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (61,372) | $ (62,686)
Available-for-Sale More than One Year, Estimated Fair Value | $ 351,793 | $ 411,417
Available-for-Sale More than One Year, Number of Securities | Security | 114 | 118
Available-for-Sale, Gross Unrealized Loss | $ (61,643) | $ (62,697)
Available-for-Sale, Estimated Fair Value | $ 375,069 | $ 413,741
Available-for-Sale, Number of Securities | Security | 124 | 123
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 | $ (12,608) | $ (11,982)
Available-for-Sale More than One Year, Estimated Fair Value | $ 41,817 | $ 47,991
Available-for-Sale More than One Year, Number of Securities | Security | 14 | 15
Available-for-Sale, Gross Unrealized Loss | $ (13,055) | $ (11,982)
Available-for-Sale, Estimated Fair Value | $ 60,909 | $ 47,991
Available-for-Sale, Number of Securities | Security | 19 | 15
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (645) | $ (38)
Available-for-Sale Within One Year, Estimated Fair Value | $ 76,963 | $ 7,074
Available-for-Sale Within One Year, Number of Securities | Security | 18 | 2
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (8,756) | $ (9,611)
Available-for-Sale More than One Year, Estimated Fair Value | $ 54,020 | $ 63,610
Available-for-Sale More than One Year, Number of Securities | Security | 24 | 24
Available-for-Sale, Gross Unrealized Loss | $ (9,401) | $ (9,649)
Available-for-Sale, Estimated Fair Value | $ 130,983 | $ 70,684
Available-for-Sale, Number of Securities | Security | 42 | 26
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 | $ (3,946) | $ (7,590)
Available-for-Sale More than One Year, Estimated Fair Value | $ 107,595 | $ 124,625
Available-for-Sale More than One Year, Number of Securities | Security | 21 | 26
Available-for-Sale, Gross Unrealized Loss | $ (3,969) | $ (7,590)
Available-for-Sale, Estimated Fair Value | $ 119,307 | $ 124,625
Available-for-Sale, Number of Securities | Security | 24 | 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 | $ (1,386) | $ (49)
Available-for-Sale Within One Year, Estimated Fair Value | $ 131,043 | $ 9,398
Available-for-Sale Within One Year, Number of Securities | Security | 36 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (86,682) | $ (91,869)
Available-for-Sale More than One Year, Estimated Fair Value | $ 555,225 | $ 647,643
Available-for-Sale More than One Year, Number of Securities | Security | 173 | 183
Available-for-Sale, Gross Unrealized Loss | $ (88,068) | $ (91,918)
Available-for-Sale, Estimated Fair Value | $ 686,268 | $ 657,041
Available-for-Sale, Number of Securities | Security | 209 | 190
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,077) | $ (9,225)
Available-for-Sale More than One Year, Estimated Fair Value | $ 65,009 | $ 67,896
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (11,077) | $ (9,225)
Available-for-Sale, Estimated Fair Value | $ 65,009 | $ 67,896
Available-for-Sale, Number of Securities | Security | 19 | 19

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