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Investment Securities - Summary of Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Fair Value, Less Than 12 Months, Total $ 35,590 $ 28,234
Unrealized Losses, Less than 12 Months, Total (753) (84)
Fair Value, 12 Months or Greater, Total 1,255 8,193
Unrealized Losses, 12 Months or Greater, Total (16) (125)
Fair Value, Total 36,845 36,427
Unrealized Losses, Total (769) (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 1,694 333
Held to maturity, Unrealized Losses, Less Than 12 Months (21) (2)
Fair Value, Total 1,694 333
Unrealized Losses, Total (21) (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 2,466  
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (34)  
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 2,466 1,949
Unrealized Losses, Total (34) (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 25,035 27,901
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (593) (82)
Available-for-sale Securities, Fair Value, 12 Months or Greater 856 5,348
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (15) (70)
Fair Value, Total 25,891 33,249
Unrealized Losses, Total (608) (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 6,395  
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (105)  
Available-for-sale Securities, Fair Value, 12 Months or Greater 399 896
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (1) (4)
Fair Value, Total 6,794 896
Unrealized Losses, Total $ (106) $ (4)