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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 | Jun. 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 | $ (690) | $ (106)
Available-for-Sale Within One Year, Estimated Fair Value | $ 121,242 | $ 30,422
Available-for-Sale Within One Year, Number of Securities | Security | 39 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (107,300) | $ (102,077)
Available-for-Sale More than One Year, Estimated Fair Value | $ 710,075 | $ 747,988
Available-for-Sale More than One Year, Number of Securities | Security | 213 | 213
Available-for-Sale, Gross Unrealized Loss | $ (107,990) | $ (102,183)
Available-for-Sale, Estimated Fair Value | $ 831,317 | $ 778,410
Available-for-Sale, Number of Securities | Security | 252 | 227
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (204) | $ (57)
Available-for-Sale Within One Year, Estimated Fair Value | $ 53,200 | $ 21,024
Available-for-Sale Within One Year, Number of Securities | Security | 17 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (827) | $ (983)
Available-for-Sale More than One Year, Estimated Fair Value | $ 33,383 | $ 32,449
Available-for-Sale More than One Year, Number of Securities | Security | 11 | 11
Available-for-Sale, Gross Unrealized Loss | $ (1,031) | $ (1,040)
Available-for-Sale, Estimated Fair Value | $ 86,583 | $ 53,473
Available-for-Sale, Number of Securities | Security | 28 | 18
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (223) | $ (11)
Available-for-Sale Within One Year, Estimated Fair Value | $ 26,217 | $ 2,324
Available-for-Sale Within One Year, Number of Securities | Security | 11 | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (65,952) | $ (62,686)
Available-for-Sale More than One Year, Estimated Fair Value | $ 379,731 | $ 411,417
Available-for-Sale More than One Year, Number of Securities | Security | 117 | 118
Available-for-Sale, Gross Unrealized Loss | $ (66,175) | $ (62,697)
Available-for-Sale, Estimated Fair Value | $ 405,948 | $ 413,741
Available-for-Sale, Number of Securities | Security | 128 | 123
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (4) |
Available-for-Sale Within One Year, Estimated Fair Value | $ 4,380 |
Available-for-Sale Within One Year, Number of Securities | Security | 1 |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (12,547) | $ (11,982)
Available-for-Sale More than One Year, Estimated Fair Value | $ 46,487 | $ 47,991
Available-for-Sale More than One Year, Number of Securities | Security | 15 | 15
Available-for-Sale, Gross Unrealized Loss | $ (12,551) | $ (11,982)
Available-for-Sale, Estimated Fair Value | $ 50,867 | $ 47,991
Available-for-Sale, Number of Securities | Security | 16 | 15
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (259) | $ (38)
Available-for-Sale Within One Year, Estimated Fair Value | $ 37,445 | $ 7,074
Available-for-Sale Within One Year, Number of Securities | Security | 10 | 2
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (9,800) | $ (9,611)
Available-for-Sale More than One Year, Estimated Fair Value | $ 64,784 | $ 63,610
Available-for-Sale More than One Year, Number of Securities | Security | 26 | 24
Available-for-Sale, Gross Unrealized Loss | $ (10,059) | $ (9,649)
Available-for-Sale, Estimated Fair Value | $ 102,229 | $ 70,684
Available-for-Sale, Number of Securities | Security | 36 | 26
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (6,656) | $ (7,590)
Available-for-Sale More than One Year, Estimated Fair Value | $ 120,602 | $ 124,625
Available-for-Sale More than One Year, Number of Securities | Security | 25 | 26
Available-for-Sale, Gross Unrealized Loss | $ (6,656) | $ (7,590)
Available-for-Sale, Estimated Fair Value | $ 120,602 | $ 124,625
Available-for-Sale, Number of Securities | Security | 25 | 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 | $ (486) | $ (49)
Available-for-Sale Within One Year, Estimated Fair Value | $ 68,042 | $ 9,398
Available-for-Sale Within One Year, Number of Securities | Security | 22 | 7
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (94,955) | $ (91,869)
Available-for-Sale More than One Year, Estimated Fair Value | $ 611,604 | $ 647,643
Available-for-Sale More than One Year, Number of Securities | Security | 183 | 183
Available-for-Sale, Gross Unrealized Loss | $ (95,441) | $ (91,918)
Available-for-Sale, Estimated Fair Value | $ 679,646 | $ 657,041
Available-for-Sale, Number of Securities | Security | 205 | 190
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,518) | $ (9,225)
Available-for-Sale More than One Year, Estimated Fair Value | $ 65,088 | $ 67,896
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (11,518) | $ (9,225)
Available-for-Sale, Estimated Fair Value | $ 65,088 | $ 67,896
Available-for-Sale, Number of Securities | Security | 19 | 19

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