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Investments - Summary of Unrealized Losses (Detail) | Sep. 30, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 133 | 36
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 251,574,000 | $ 29,308,000
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (3,969,000) | (231,000)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 1,821,000 | 10,547,000
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (20,000) | (378,000)
Fair Value, Total | 253,395,000 | 39,855,000
Unrealized Losses, Total | $ (3,989,000) | $ (609,000)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 31 | 6
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 19,291,000 | $ 3,111,000
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (280,000) | (68,000)
Fair Value, Total | 19,291,000 | 3,111,000
Unrealized Losses, Total | $ (280,000) | $ (68,000)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 20 | 1
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 46,234,000 | $ 2,410,000
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (664,000) | (91,000)
Fair Value, Total | 46,234,000 | 2,410,000
Unrealized Losses, Total | $ (664,000) | $ (91,000)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 72 | 22
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 180,950,000 | $ 20,545,000
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (2,795,000) | (65,000)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 834,000 | 8,592,000
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (7,000) | (333,000)
Fair Value, Total | 181,784,000 | 29,137,000
Unrealized Losses, Total | $ (2,802,000) | $ (398,000)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 10 | 7
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 5,099,000 | $ 3,242,000
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (230,000) | (7,000)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 987 | 1,955,000
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (13) | (45,000)
Fair Value, Total | 6,086,000 | 5,197,000
Unrealized Losses, Total | $ (243,000) | $ (52,000)

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