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Investment Securities - Summary of Unrealized Losses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Fair Value, Less Than 12 Months, Total $ 14,125 $ 28,234
Unrealized Losses, Less than 12 Months, Total (2,366) (84)
Fair Value, 12 Months or Greater, Total 2,323 8,193
Unrealized Losses, 12 Months or Greater, Total (36) (125)
Fair Value, Total 16,448 36,427
Unrealized Losses, Total (2,402) (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 424 333
Held to maturity, Unrealized Losses, Less Than 12 Months (3) (2)
Fair Value, Total 424 333
Unrealized Losses, Total (3) (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 985 1,949
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (15) (51)
Fair Value, Total 985 1,949
Unrealized Losses, Total (15) (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 9,630 27,901
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (1,934) (82)
Available-for-sale Securities, Fair Value, 12 Months or Greater 942 5,348
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (17) (70)
Fair Value, Total 10,572 33,249
Unrealized Losses, Total (1,951) (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 4,071  
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (429)  
Available-for-sale Securities, Fair Value, 12 Months or Greater 396 896
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (4) (4)
Fair Value, Total 4,467 896
Unrealized Losses, Total $ (433) $ (4)