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Leases - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Jan. 01, 2019
Operating Lease, Right-of-Use Asset     $ 3,500,000
Operating Lease, Liability $ 3,014,000 $ 3,014,000  
Operating Lease, Expense $ 150,000 $ 446,000  
Operating leases terms 7 years 7 years  
Weighted average discount rate, percentage 2.57% 2.57%  
Other Assets [Member]      
Operating Lease, Right-of-Use Asset $ 3,000,000.0 $ 3,000,000.0  
Other Liabilities [Member]      
Operating Lease, Liability $ 3,200,000 $ 3,200,000