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Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total ending allowance balance $ 15,054 $ 14,837 $ 14,236 $ 14,534
Total ending loans balance 1,379   $ 5,788  
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 15,054 14,833    
Total ending allowance balance 15,054 14,837    
Allowance for Loan Losses [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 7,600 6,575    
Total ending allowance balance 7,600 6,579    
Commercial [Member] | Allowance for Loan Losses [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 1,697 2,090    
Total ending allowance balance 1,697 2,090    
Real Estate [Member] | Allowance for Loan Losses [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 4,715 4,914    
Total ending allowance balance 4,715 4,914    
Consumer [Member] | Allowance for Loan Losses [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 1,379 2,250    
Loans: Collectively evaluated for impairment 2,152,019 2,140,481    
Total ending loans balance 2,153,398 2,142,731    
Loans [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 1,379 2,250    
Loans: Collectively evaluated for impairment 1,108,306 1,071,199    
Total ending loans balance 1,109,685 1,073,449    
Loans [Member] | Commercial [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 535,150 533,399    
Total ending loans balance 535,150 533,399    
Loans [Member] | Real Estate [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 418,723 399,676    
Total ending loans balance 418,723 399,676    
Loans [Member] | Consumer [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 1,042 1,254    
Total ending allowance balance 1,042 1,254    
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [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 89,840 136,207    
Total ending loans balance 89,840 136,207    
Mortgage Warehousing [Member] | Loans [Member] | Loans and Allowance Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans acquired with deteriorated credit quality $ 0 $ 0