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Investment Securities - Amortized Cost and Estimated Fair Value by Maturity of Company's Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Securities available for sale, One Year or Less, Fair Value $ 2,963  
Securities available for sale, One Year to Five Years, Fair Value 28,871  
Securities available for sale, Five to Ten Years, Fair Value 94,564  
Securities available for sale, Over Ten Years, Fair Value 130,923  
Total available for sale, Fair Value 257,321 $ 260,131
Securities held to maturity, One Year or Less, Fair Value 0  
Securities held to maturity, One Year to Five Years, Fair Value 2,970  
Securities held to maturity, Five to Ten Years, Fair Value 4,224  
Securities held to maturity, Over Ten Years, Fair Value 0  
Total held to maturity, Fair Value 7,194 10,841
Securities available for sale, Amortized Cost, One Year or Less 2,959  
Securities available for sale, Amortized Cost, One Year to Five Years 28,751  
Securities available for sale, Amortized Cost, Five to Ten Years 94,065  
Securities available for sale, Amortized Cost, Over Ten Years 130,670  
Securities available for sale, Amortized Cost 256,445 262,923
Securities held to maturity, Amortized Cost, One Year or Less 0  
Securities held to maturity, Amortized Cost, One Year to Five Years 2,961  
Securities held to maturity, Amortized Cost, Five to Ten Years 4,188  
Securities held to maturity, Amortized Cost, Over Ten Years 0  
Securities held to maturity, Amortized Cost 7,149 10,872
U.S. agency mortgage-backed    
Debt and Equity Securities, FV-NI [Line Items]    
Securities available for sale, One Year or Less, Fair Value 66  
Securities available for sale, One Year to Five Years, Fair Value 16,306  
Securities available for sale, Five to Ten Years, Fair Value 50,888  
Securities available for sale, Over Ten Years, Fair Value 27,912  
Total available for sale, Fair Value 95,172 85,909
Securities available for sale, Amortized Cost, One Year or Less 64  
Securities available for sale, Amortized Cost, One Year to Five Years 16,222  
Securities available for sale, Amortized Cost, Five to Ten Years 50,789  
Securities available for sale, Amortized Cost, Over Ten Years 27,371  
Securities available for sale, Amortized Cost 94,446 86,487
Collateralized mortgage obligations    
Debt and Equity Securities, FV-NI [Line Items]    
Securities available for sale, One Year or Less, Fair Value 1,689  
Securities available for sale, One Year to Five Years, Fair Value 5,356  
Securities available for sale, Five to Ten Years, Fair Value 34,269  
Securities available for sale, Over Ten Years, Fair Value 101,137  
Total available for sale, Fair Value 142,451 143,591
Securities available for sale, Amortized Cost, One Year or Less 1,688  
Securities available for sale, Amortized Cost, One Year to Five Years 5,356  
Securities available for sale, Amortized Cost, Five to Ten Years 33,894  
Securities available for sale, Amortized Cost, Over Ten Years 101,470  
Securities available for sale, Amortized Cost 142,408 145,814
Municipal bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Securities available for sale, One Year or Less, Fair Value 1,208  
Securities available for sale, One Year to Five Years, Fair Value 7,209  
Securities available for sale, Five to Ten Years, Fair Value 6,180  
Securities available for sale, Over Ten Years, Fair Value 1,408  
Total available for sale, Fair Value 16,005 21,477
Securities held to maturity, One Year or Less, Fair Value 0  
Securities held to maturity, One Year to Five Years, Fair Value 2,970  
Securities held to maturity, Five to Ten Years, Fair Value 4,224  
Securities held to maturity, Over Ten Years, Fair Value 0  
Total held to maturity, Fair Value 7,194 10,841
Securities available for sale, Amortized Cost, One Year or Less 1,207  
Securities available for sale, Amortized Cost, One Year to Five Years 7,173  
Securities available for sale, Amortized Cost, Five to Ten Years 6,162  
Securities available for sale, Amortized Cost, Over Ten Years 1,353  
Securities available for sale, Amortized Cost 15,895 21,453
Securities held to maturity, Amortized Cost, One Year or Less 0  
Securities held to maturity, Amortized Cost, One Year to Five Years 2,961  
Securities held to maturity, Amortized Cost, Five to Ten Years 4,188  
Securities held to maturity, Amortized Cost, Over Ten Years 0  
Securities held to maturity, Amortized Cost 7,149 10,872
U.S. government agency    
Debt and Equity Securities, FV-NI [Line Items]    
Securities available for sale, One Year or Less, Fair Value 0  
Securities available for sale, One Year to Five Years, Fair Value 0  
Securities available for sale, Five to Ten Years, Fair Value 3,227  
Securities available for sale, Over Ten Years, Fair Value 466  
Total available for sale, Fair Value 3,693 9,154
Securities available for sale, Amortized Cost, One Year or Less 0  
Securities available for sale, Amortized Cost, One Year to Five Years 0  
Securities available for sale, Amortized Cost, Five to Ten Years 3,220  
Securities available for sale, Amortized Cost, Over Ten Years 476  
Securities available for sale, Amortized Cost $ 3,696 $ 9,169