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Investments - Summary of Unrealized Losses (Detail) $ in Thousands | Sep. 30, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 221 | 125
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 128,201 | $ 285,666
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (16,182) | (6,714)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 208,282 | 1,539
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (47,091) | (8)
Fair Value, Total | 336,483 | 287,205
Unrealized Losses, Total | $ (63,273) | $ (6,722)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 85 | 38
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 31,675 | $ 27,905
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (5,226) | (530)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 18,772 |
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (4,372) |
Fair Value, Total | 50,447 | 27,905
Unrealized Losses, Total | $ (9,598) | $ (530)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 23 | 22
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 17,366 | $ 64,067
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (3,018) | (1,614)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 42,713 |
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (8,938) |
Fair Value, Total | 60,079 | 64,067
Unrealized Losses, Total | $ (11,956) | $ (1,614)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 85 | 54
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 56,101 | $ 186,924
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (5,940) | (4,257)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 142,728 | 543
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (33,275) | (4)
Fair Value, Total | 198,829 | 187,467
Unrealized Losses, Total | $ (39,215) | $ (4,261)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 28 | 11
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 23,059 | $ 6,770
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (1,998) | (313)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 4,069 | 996
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (506) | (4)
Fair Value, Total | 27,128 | 7,766
Unrealized Losses, Total | $ (2,504) | $ (317)

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