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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available For Sale Securities Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 9,390  
Amortized Cost, After one year through five years 49,534  
Amortized Cost, After five years through ten years 84,035  
Amortized Cost, After ten years 7,807  
Amortized Cost, Total 150,766  
Amortized Cost, Mortgage-backed securities 100,858  
Amortized Cost 251,624 $ 220,904
Fair Value, One year or less 9,410  
Fair Value, After one year through five years 50,784  
Fair Value, After five years through ten years 87,646  
Fair Value, After ten years 8,221  
Fair Value, Total 156,061  
Fair Value, Mortgage-backed securities 102,980  
Total, Fair Value $ 259,041 $ 222,293