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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 7,903 $ 9,832
Recorded Investment with no Allowance 5,257 5,565
Recorded Investment with Allowance 682 2,317
Total Recorded Investment 5,939 7,882
Related Allowance 66 244
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,722 3,352
Recorded Investment with no Allowance 1,093 1,329
Recorded Investment with Allowance 4 399
Total Recorded Investment 1,097 1,728
Related Allowance 4 74
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,656 4,826
Recorded Investment with no Allowance 3,145 3,117
Recorded Investment with Allowance 319 1,566
Total Recorded Investment 3,464 4,683
Related Allowance 46 151
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,525 1,654
Recorded Investment with no Allowance 1,019 1,119
Recorded Investment with Allowance 359 352
Total Recorded Investment 1,378 1,471
Related Allowance $ 16 $ 19