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Investments - Summary of Unrealized Losses (Detail) $ in Thousands | Mar. 31, 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 | 184 | 125
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 269,668 | $ 285,666
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (22,079) | (6,714)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 59,225 | 1,539
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (6,298) | (8)
Fair Value, Total | 328,893 | 287,205
Unrealized Losses, Total | $ (28,377) | $ (6,722)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 75 | 38
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 44,827 | $ 27,905
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (3,611) | (530)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 4,986 |
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (430) |
Fair Value, Total | 49,813 | 27,905
Unrealized Losses, Total | $ (4,041) | $ (530)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 28 | 22
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 51,162 | $ 64,067
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (4,376) | (1,614)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 10,193 |
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (1,307) |
Fair Value, Total | 61,355 | 64,067
Unrealized Losses, Total | $ (5,683) | $ (1,614)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 65 | 54
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 158,560 | $ 186,924
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (13,607) | (4,257)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 42,108 | 543
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (4,499) | (4)
Fair Value, Total | 200,668 | 187,467
Unrealized Losses, Total | $ (18,106) | $ (4,261)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 16 | 11
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 15,119 | $ 6,770
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (485) | (313)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 1,938 | 996
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (62) | (4)
Fair Value, Total | 17,057 | 7,766
Unrealized Losses, Total | $ (547) | $ (317)

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