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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
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 3,625 $ 5,067
Collectively evaluated for impairment 82,634 50,458
Total 86,259 55,525
Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 1,559 1,580
Collectively evaluated for impairment 53,312 23,931
Total 54,871  
Commercial Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 2,024 3,462
Collectively evaluated for impairment 23,260 24,801
Total 25,284  
Consumer Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 42 25
Collectively evaluated for impairment 6,062 $ 1,726
Total $ 6,104