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Leases - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Operating Lease, Right-of-Use Asset   $ 3,500,000
Operating Lease, Liability $ 3,250,000 $ 3,400,000
Operating Lease, Expense $ 148,000  
Operating leases terms 7 years  
Weighted average discount rate, percentage 2.57%  
Other Assets [Member]    
Operating Lease, Right-of-Use Asset $ 3,300,000  
Other Liabilities [Member]    
Operating Lease, Liability $ 3,400,000