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Investments - Summary of Unrealized Losses (Detail)
Sep. 30, 2021
USD ($)
Security
Dec. 31, 2020
USD ($)
Security
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)