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Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
Significant Accounting Policies [Line Items]  
Delinquent period of loans resulting in accrued interest being charged against income 90 days
Delinquent period of loans secured by real estate resulting in charge off 150 days
Maximum [Member]  
Significant Accounting Policies [Line Items]  
Loans secured by real estate delinquent period threshold for return to accrual status 90 days
Consumer loan delinquent period threshold for consideration for charge off 180 days
Estimated useful lives 10 years
Minimum [Member]  
Significant Accounting Policies [Line Items]  
Consumer loan delinquent period threshold for consideration for charge off 91 days
Estimated useful lives 5 years
Income tax benefit recognition criteria percentage threshold 50.00%