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Investment Securities and Other Investments - Summary of Unrealized Losses (Detail) $ in Thousands | Sep. 30, 2024 USD ($) Security | Dec. 31, 2023 USD ($) Security
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 212 | 219
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 2,539 | $ 15,785
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (41) | (885)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 309,246 | 300,674
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (44,652) | (57,700)
Fair Value, Total | 311,785 | 316,459
Unrealized Losses, Total | $ (44,693) | $ (58,585)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 64 | 65
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 330 | $ 536
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (1) | (9)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 41,953 | 41,118
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (5,766) | (7,348)
Fair Value, Total | 42,283 | 41,654
Unrealized Losses, Total | $ (5,767) | $ (7,357)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 29 | 29
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 0 | $ 283
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | 0 | (1)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 71,452 | 68,399
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (7,975) | (10,984)
Fair Value, Total | 71,452 | 68,682
Unrealized Losses, Total | $ (7,975) | $ (10,985)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 79 | 86
Available-for-sale Securities, Fair Value, Less Than 12 Months |  | $ 7,497
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months |  | (45)
Available-for-sale Securities, Fair Value, 12 Months or Greater | $ 165,434 | 169,474
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (27,434) | (35,199)
Fair Value, Total | 165,434 | 176,971
Unrealized Losses, Total | $ (27,434) | $ (35,244)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 40 | 39
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 2,209 | $ 7,469
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (40) | (830)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 30,407 | 21,683
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (3,477) | (4,169)
Fair Value, Total | 32,616 | 29,152
Unrealized Losses, Total | $ (3,517) | $ (4,999)

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