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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment $ 2,151   $ 1,184      
Allowance for loan losses, Collectively evaluated for impairment 13,369   12,807      
Allowance for loan losses, Modified in a troubled debt restructuring 1,749   2,339      
Acquired with deteriorated credit quality 17,269 $ 16,546 16,330 $ 15,988 $ 16,738 $ 16,737
Loans:            
Loans individually evaluated for impairment 6,724   6,951      
Loans collectively evaluated for impairment 2,004,895   1,856,452      
Acquired with deteriorated credit quality 1,255,098   1,142,626      
Loans modified in a troubled debt restructuring 11,187   11,831      
Total ending loans balance 2,024,307   1,876,966      
Receivables Acquired with Deteriorated Credit Quality [Member]            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 1,501   1,732      
Commercial, Industrial, and Agricultural [Member]            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   188      
Allowance for loan losses, Collectively evaluated for impairment 5,442   5,115      
Allowance for loan losses, Modified in a troubled debt restructuring 121   125      
Acquired with deteriorated credit quality 5,563 4,785 5,428 5,218 5,627 6,035
Loans:            
Loans individually evaluated for impairment 630   775      
Loans collectively evaluated for impairment 633,655   564,180      
Acquired with deteriorated credit quality 636,836   567,800      
Loans modified in a troubled debt restructuring 2,551   2,640      
Total ending loans balance 636,836   567,800      
Commercial, Industrial, and Agricultural [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 0   205      
Commercial Mortgages [Member]            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 2,151   996      
Allowance for loan losses, Collectively evaluated for impairment 3,862   3,543      
Allowance for loan losses, Modified in a troubled debt restructuring 1,628   2,214      
Acquired with deteriorated credit quality 7,641 7,357 6,753 6,207 6,044 5,605
Loans:            
Loans individually evaluated for impairment 6,094   6,176      
Loans collectively evaluated for impairment 602,031   557,932      
Acquired with deteriorated credit quality 618,262   574,826      
Loans modified in a troubled debt restructuring 8,636   9,191      
Total ending loans balance 618,262   574,826      
Commercial Mortgages [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 1,501   1,527      
Residential Real Estate [Member]            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 1,670   1,653      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Acquired with deteriorated credit quality 1,670 2,022 1,653 2,299 2,574 2,475
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 684,294   652,883      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance 684,294   652,883      
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 0   0      
Consumer [Member]            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 2,068   2,215      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Acquired with deteriorated credit quality 2,068 2,089 2,215 2,066 2,274 2,371
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 76,476   74,816      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance 74,476   74,816      
Consumer [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 0   0      
Credit Cards [Member]            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 142   93      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Acquired with deteriorated credit quality 142 105 93 50 81 90
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 6,080   6,046      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance 6,080   6,046      
Credit Cards [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality 0   0      
Overdrafts [Member]            
Ending allowance balance attributable to loans:            
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 185   188      
Allowance for loan losses, Modified in a troubled debt restructuring 0   0      
Acquired with deteriorated credit quality 185 $ 188 188 $ 148 $ 138 $ 161
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 2,359   595      
Loans modified in a troubled debt restructuring 0   0      
Total ending loans balance 2,359   595      
Overdrafts [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]            
Ending allowance balance attributable to loans:            
Acquired with deteriorated credit quality 0   0      
Loans:            
Acquired with deteriorated credit quality $ 0   $ 0