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Investment Securities - Summary of Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Fair Value, Less Than 12 Months, Total $ 33,099 $ 28,234
Unrealized Losses, Less than 12 Months, Total (1,565) (84)
Fair Value, 12 Months or Greater, Total 1,334 8,193
Unrealized Losses, 12 Months or Greater, Total (19) (125)
Fair Value, Total 34,433 36,427
Unrealized Losses, Total (1,584) (209)
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 27,815 27,901
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (1,349) (82)
Available-for-sale Securities, Fair Value, 12 Months or Greater 936 5,348
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (17) (70)
Fair Value, Total 28,751 33,249
Unrealized Losses, Total (1,366) (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 5,284  
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (216)  
Available-for-sale Securities, Fair Value, 12 Months or Greater 398 896
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (2) (4)
Fair Value, Total 5,682 896
Unrealized Losses, Total $ (218) (4)
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   333
Held to maturity, Unrealized Losses, Less Than 12 Months   (2)
Fair Value, Total   333
Unrealized Losses, Total   (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, 12 Months or Greater   1,949
Available-for-sale Securities, Unrealized Losses, 12 months or Greater   (51)
Fair Value, Total   1,949
Unrealized Losses, Total   $ (51)