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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available For Sale Securities Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 22,150  
Amortized Cost, After one year through five years 42,705  
Amortized Cost, After five years through ten years 57,231  
Amortized Cost, After ten years 3,820  
Amortized Cost, Total 125,906  
Amortized Cost, Mortgage-backed securities 94,998  
Amortized Cost 220,904 $ 172,263
Fair Value, One year or less 22,158  
Fair Value, After one year through five years 42,983  
Fair Value, After five years through ten years 58,149  
Fair Value, After ten years 3,806  
Fair Value, Total 127,096  
Fair Value, Mortgage-backed securities 95,197  
Total, Fair Value $ 222,293 $ 168,447