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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 8,708 $ 7,953
Recorded Investment with no Allowance 4,527 3,326
Recorded Investment with Allowance 3,806 3,847
Total Recorded Investment 8,333 7,173
Related Allowance 841 729
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,181 5,476
Recorded Investment with no Allowance 1,012 1,690
Recorded Investment with Allowance 2,160 3,354
Total Recorded Investment 3,172 5,044
Related Allowance 573 705
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,884 796
Recorded Investment with no Allowance 2,456 600
Recorded Investment with Allowance 1,237 21
Total Recorded Investment 3,693 621
Related Allowance 243  
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,643 1,681
Recorded Investment with no Allowance 1,059 1,036
Recorded Investment with Allowance 409 472
Total Recorded Investment 1,468 1,508
Related Allowance $ 25 $ 24