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Loans Receivable and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
SecurityLoan
Dec. 31, 2016
USD ($)
SecurityLoan
Financing Receivable, Recorded Investment [Line Items]    
Number of Loans | SecurityLoan 8 1
Pre-Modification Outstanding Recorded Investment $ 3,604 $ 1,300
Post-Modification Outstanding Recorded Investment $ 3,391 $ 1,300
Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Number of Loans | SecurityLoan 5  
Pre-Modification Outstanding Recorded Investment $ 2,468  
Post-Modification Outstanding Recorded Investment $ 2,260  
Mortgage Portfolio Segment [Member] | Residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Number of Loans | SecurityLoan 5  
Pre-Modification Outstanding Recorded Investment $ 2,468  
Post-Modification Outstanding Recorded Investment $ 2,260  
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Number of Loans | SecurityLoan 1 1
Pre-Modification Outstanding Recorded Investment $ 874 $ 1,300
Post-Modification Outstanding Recorded Investment $ 874 $ 1,300
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Number of Loans | SecurityLoan 2  
Pre-Modification Outstanding Recorded Investment $ 262  
Post-Modification Outstanding Recorded Investment $ 257