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Goodwill and Intangible Assets - Schedule of Mortgage Servicing Rights (MSRs) and Related Valuation Allowance (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mortgage Servicing Rights:    
Beginning of year $ 1,562,000 $ 1,664,000
Additions 1,310,000 247,000
Amortized to expense 524,000 247,000
Change in valuation allowance 102,000 102,000
End of year 2,246,000 1,562,000
Valuation allowance:    
Beginning of year 102,000  
Additions expensed 162,000 102,000
Reductions credited to operations (60,000)  
End of year $ 204,000 $ 102,000