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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Operating Lease, Right-of-Use Asset $ 3,500 $ 3,400
Operating Lease, Liability 3,014  
Operating Lease, Expense $ 591,000  
Operating leases terms 6 years 4 months 24 days  
Weighted average discount rate, percentage 2.57%  
Bank Branch And Office Space [Member]    
Operating leases terms 7 years  
Other Assets [Member]    
Operating Lease, Right-of-Use Asset $ 2,700  
Other Liabilities [Member]    
Operating Lease, Liability $ 2,700