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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]    
Amortized Cost, Due in one year or less $ 11,749,000  
Amortized Cost, Due from one to five years 13,675,000  
Amortized Cost, Due from five to ten years 28,114,000  
Amortized Cost, Due after ten years 175,954,000  
Amortized Cost, Mortgage-backed securities in government sponsored entities 106,824,000  
Amortized Cost, Total securities available for sale 336,316,000 $ 342,192,000
Fair Value, Due in one year or less 11,898,000  
Fair Value, Due from one to five years 14,118,000  
Fair Value, Due from five to ten years 30,236,000  
Fair Value, Due after ten years 194,453,000  
Fair Value, Mortgage-backed securities in government sponsored entities 112,759,000  
Fair Value, Total securities available for sale $ 363,464,000 $ 358,499,000