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Investments - Summary of Unrealized Losses (Detail) $ in Thousands | Jun. 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 | 115 | 36
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 148,558 | $ 29,308
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (3,021) | (231)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 1,219 | 10,547
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (11) | (378)
Fair Value, Total | 149,777 | 39,855
Unrealized Losses, Total | $ (3,032) | $ (609)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 30 | 6
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 14,681 | $ 3,111
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (108) | (68)
Fair Value, Total | 14,681 | 3,111
Unrealized Losses, Total | $ (108) | $ (68)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 13 | 1
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 20,368 | $ 2,410
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (543) | (91)
Fair Value, Total | 20,368 | 2,410
Unrealized Losses, Total | $ (543) | $ (91)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 64 | 22
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 109,559 | $ 20,545
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (2,254) | (65)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 1,219 | 8,592
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (11) | (333)
Fair Value, Total | 110,778 | 29,137
Unrealized Losses, Total | $ (2,265) | $ (398)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of Securities | Security | 8 | 7
Available-for-sale Securities, Fair Value, Less Than 12 Months | $ 3,950 | $ 3,242
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (116) | (7)
Available-for-sale Securities, Fair Value, 12 Months or Greater |  | 1,955
Available-for-sale Securities, Unrealized Losses, 12 months or Greater |  | (45)
Fair Value, Total | 3,950 | 5,197
Unrealized Losses, Total | $ (116) | $ (52)

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