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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 8,436 $ 7,953
Recorded Investment with no Allowance 5,986 3,326
Recorded Investment with Allowance 448 3,847
Total Recorded Investment 6,434 7,173
Related Allowance 49 729
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,868 5,476
Recorded Investment with no Allowance 1,238 1,690
Recorded Investment with Allowance 5 3,354
Total Recorded Investment 1,243 5,044
Related Allowance 5 705
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,901 796
Recorded Investment with no Allowance 3,653 600
Recorded Investment with Allowance 51 21
Total Recorded Investment 3,704 621
Related Allowance 20  
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,667 1,681
Recorded Investment with no Allowance 1,095 1,036
Recorded Investment with Allowance 392 472
Total Recorded Investment 1,487 1,508
Related Allowance $ 24 $ 24