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Off-Balance Sheet Activities - Schedule of Off-Balance Sheet Risks (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Commitments to make loans | Fixed Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability $ 21,375 $ 46,265
Commitments to make loans | Variable Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability 184,106 191,803
Unused lines of credit | Fixed Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability 14,637 14,390
Unused lines of credit | Variable Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability 446,407 429,456
Standby letters of credit | Fixed Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability 14,503 14,831
Standby letters of credit | Variable Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability $ 824 $ 1,479