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Loans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Loans [Line Items]    
Reverse mortgage, fair value $ 16,500 $ 19,800
Nonaccruing loans 30,100 36,400
Potential increase in net interest income 2,000 1,800
Accrued interest receivable 22,001 19,405
Loans Receivable    
Loans [Line Items]    
Accrued interest receivable 17,000 15,400
First Mortgage    
Loans [Line Items]    
Amounts of loans serviced 98,600 102,500
Fees from servicing of loans 500 400
Value of servicing rights 300 400
First Mortgage | Maximum | Servicing Rights    
Loans [Line Items]    
Net losses 200 100
SBA Loans    
Loans [Line Items]    
Value of servicing rights $ 1,100 $ 500