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Loans Receivable and Allowance for Loan Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment $ 3,032 $ 2,334    
Collectively evaluated for impairment 59,123 59,549    
Total 62,155 61,883 $ 62,191 $ 61,424
Mortgage Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 1,880 1,986    
Collectively evaluated for impairment 27,438 27,640    
Total 29,318 29,626 30,849 32,094
Commercial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 1,050 268    
Collectively evaluated for impairment 28,736 28,875    
Total 29,786 29,143 28,255 25,829
Consumer Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Individually evaluated for impairment 102 80    
Collectively evaluated for impairment 2,949 3,034    
Total $ 3,051 $ 3,114 $ 3,087 $ 3,501