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Loans Receivable and Allowance for Credit Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 3,300 $ 5,067
Collectively evaluated for impairment 103,014 50,458
Total 106,314 55,525
Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 1,391 1,580
Collectively evaluated for impairment 68,399 23,931
Total 69,790  
Commercial Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 1,876 3,462
Collectively evaluated for impairment 27,709 24,801
Total 29,585  
Consumer Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 33 25
Collectively evaluated for impairment 6,906 $ 1,726
Total $ 6,939