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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
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment $ 2,872   $ 2,334      
Collectively evaluated for impairment 57,404   59,549      
Total 60,276 $ 62,862 61,883 $ 61,088 $ 60,933 $ 61,424
Mortgage Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 1,773   1,986      
Collectively evaluated for impairment 24,724   27,640      
Total 26,497 28,826 29,626 29,654 31,634 32,094
Consumer Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 71   80      
Collectively evaluated for impairment 2,257   3,034      
Total 2,328 2,951 3,114 3,195 3,000 3,501
Commercial Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 1,028   268      
Collectively evaluated for impairment 30,423   28,875      
Total 31,451 31,085 29,143 28,239 26,299 25,829
Total Portfolio Segments [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total 60,276 62,862 61,883 61,088 60,933 61,424
Unallocated [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total $ 0 $ 0 $ 0 $ 0 $ 0 $ 0