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Investment Securities and Other Investments - Summary of Unrealized Losses (Detail) $ in Thousands | Sep. 30, 2023 USD ($) Security | Dec. 31, 2022 USD ($) Security
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 212 | 221
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 13,087 | $ 93,180
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (1,089) | (8,561)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 289,677 | 242,340
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (68,712) | (50,288)
Fair Value, Total | 302,764 | 335,520
Unrealized Losses, Total | $ (69,801) | $ (58,849)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 71 | 82
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 2,026 | $ 18,252
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (54) | (2,178)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 39,251 | 31,530
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (9,791) | (6,847)
Fair Value, Total | 41,277 | 49,782
Unrealized Losses, Total | $ (9,845) | $ (9,025)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 25 | 28
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 479 | $ 9,904
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months |  | (1,039)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 59,410 | 56,686
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (12,651) | (11,872)
Fair Value, Total | 59,889 | 66,590
Unrealized Losses, Total | $ (12,651) | $ (12,911)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 83 | 78
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 1,013 | $ 39,006
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (104) | (3,061)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 171,876 | 148,449
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (42,801) | (30,669)
Fair Value, Total | 172,889 | 187,455
Unrealized Losses, Total | $ (42,905) | $ (33,730)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 33 | 33
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 9,569 | $ 26,018
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (931) | (2,283)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 19,140 | 5,675
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (3,469) | (900)
Fair Value, Total | 28,709 | 31,693
Unrealized Losses, Total | $ (4,400) | $ (3,183)

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