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Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
SecurityLoan
Sep. 30, 2016
USD ($)
SecurityLoan
Sep. 30, 2017
USD ($)
SecurityLoan
Sep. 30, 2016
USD ($)
SecurityLoan
Financing Receivable, Recorded Investment [Line Items]        
Number of Loans | SecurityLoan 2 0 9 0
Pre-Modification Outstanding Recorded Investment $ 632 $ 0 $ 4,806 $ 0
Post-Modification Outstanding Recorded Investment $ 470 $ 0 $ 4,480 $ 0
Mortgage Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of Loans | SecurityLoan 2 0 7 0
Pre-Modification Outstanding Recorded Investment $ 632 $ 0 $ 3,436 $ 0
Post-Modification Outstanding Recorded Investment $ 470 $ 0 $ 3,202 $ 0
Mortgage Portfolio Segment [Member] | Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of Loans | SecurityLoan 2 0 7 0
Pre-Modification Outstanding Recorded Investment $ 632 $ 0 $ 3,436 $ 0
Post-Modification Outstanding Recorded Investment $ 470 $ 0 $ 3,202 $ 0
Commercial Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of Loans | SecurityLoan     1 0
Pre-Modification Outstanding Recorded Investment     $ 1,300 $ 0
Post-Modification Outstanding Recorded Investment     $ 1,210 $ 0
Consumer Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of Loans | SecurityLoan     1 0
Pre-Modification Outstanding Recorded Investment     $ 70 $ 0
Post-Modification Outstanding Recorded Investment     $ 68 $ 0