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Allowance for Loan Losses - 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
Dec. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]              
Total ending allowance balance $ 15,027 $ 15,054 $ 14,837 $ 14,837 $ 14,226 $ 14,236 $ 14,534
Total ending loans balance 3,640       $ 4,344    
Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Total ending allowance balance 71   0        
Allowance for Loan Losses [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Individually evaluated for impairment     4        
Allowance For Loan Losses, Collectively evaluated for impairment 15,027   14,833        
Total ending allowance balance 15,027   14,837        
Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Loans acquired with deteriorated credit quality 0   0        
Commercial [Member] | Allowance for Loan Losses [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Individually evaluated for impairment     4        
Allowance For Loan Losses, Collectively evaluated for impairment 7,617   6,575        
Total ending allowance balance 7,617   6,579        
Commercial [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Loans acquired with deteriorated credit quality 0   0        
Real Estate [Member] | Allowance for Loan Losses [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Collectively evaluated for impairment 1,750   2,090        
Total ending allowance balance 1,750   2,090        
Real Estate [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Loans acquired with deteriorated credit quality 0   0        
Consumer [Member] | Allowance for Loan Losses [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Collectively evaluated for impairment 4,570   4,914        
Total ending allowance balance 4,570   4,914        
Consumer [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Loans acquired with deteriorated credit quality 0   0        
Loans [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans: Individually evaluated for impairment 3,640   2,250        
Loans: Collectively evaluated for impairment 2,270,971   2,140,481        
Total ending loans balance 2,274,611   2,142,731        
Loans [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans acquired with deteriorated credit quality 0   0        
Loans [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans: Individually evaluated for impairment 3,640   2,250        
Loans: Collectively evaluated for impairment 1,143,660   1,071,199        
Total ending loans balance 1,147,300   1,073,449        
Loans [Member] | Commercial [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans acquired with deteriorated credit quality 0   0        
Loans [Member] | Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans: Collectively evaluated for impairment 551,574   533,399        
Total ending loans balance 551,574   533,399        
Loans [Member] | Real Estate [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans acquired with deteriorated credit quality 0   0        
Loans [Member] | Consumer [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans: Collectively evaluated for impairment 451,500   399,676        
Total ending loans balance 451,500   399,676        
Loans [Member] | Consumer [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans acquired with deteriorated credit quality 0   0        
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Collectively evaluated for impairment 1,090   1,254        
Total ending allowance balance 1,090   1,254        
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Allowance For Loan Losses, Loans acquired with deteriorated credit quality 0   0        
Mortgage Warehousing [Member] | Loans [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans: Collectively evaluated for impairment 124,237   136,207        
Total ending loans balance 124,237   136,207        
Mortgage Warehousing [Member] | Loans [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans acquired with deteriorated credit quality $ 0   $ 0