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Investment Securities and Other Investments - Summary of Fair Value and Gross Unrealized Losses of Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Fair Value, Less Than 12 Months, Total $ 29,308 $ 28,234
Unrealized Losses, Less than 12 Months, Total (231) (84)
Fair Value, 12 Months or Greater, Total 10,547 8,193
Unrealized Losses, 12 Months or Greater, Total (378) (125)
Fair Value, Total 39,855 36,427
Unrealized Losses, Total (609) (209)
State and Municipal [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Held to maturity, Fair Value, Less Than 12 Months 3,111 333
Held to maturity, Unrealized Losses, Less Than 12 Months (68) (2)
Fair Value, Total 3,111 333
Unrealized Losses, Total (68) (2)
U.S. Treasury and Agencies [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months 2,410  
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (91)  
Available-for-sale Securities, Fair Value, 12 Months or Greater   1,949
Available-for-sale Securities, Unrealized Losses, 12 months or Greater   (51)
Fair Value, Total 2,410 1,949
Unrealized Losses, Total (91) (51)
Mortgage Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months 20,545 27,901
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (65) (82)
Available-for-sale Securities, Fair Value, 12 Months or Greater 8,592 5,348
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (333) (70)
Fair Value, Total 29,137 33,249
Unrealized Losses, Total (398) (152)
Corporate Bonds [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months 3,242  
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (7)  
Available-for-sale Securities, Fair Value, 12 Months or Greater 1,955 896
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (45) (4)
Fair Value, Total 5,197 896
Unrealized Losses, Total $ (52) $ (4)