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Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total ending allowance balance $ 14,837 $ 14,534 $ 16,501 $ 15,992
Total ending loans balance 2,250 7,019 $ 11,055  
Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Individually evaluated for impairment 4 202    
Allowance For Loan Losses, Collectively evaluated for impairment 14,833 14,078    
Total ending allowance balance 14,837 14,534    
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   254    
Commercial [Member] | Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Individually evaluated for impairment 4 202    
Allowance For Loan Losses, Collectively evaluated for impairment 6,575 6,739    
Total ending allowance balance 6,579 7,195    
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   254    
Real Estate [Member] | Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Collectively evaluated for impairment 2,090 2,476    
Total ending allowance balance 2,090 2,476    
Consumer [Member] | Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Collectively evaluated for impairment 4,914 3,856    
Total ending allowance balance 4,914 3,856    
Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans: Individually evaluated for impairment 2,250 7,019    
Loans: Collectively evaluated for impairment 2,140,481 1,745,499    
Total ending loans balance 2,142,731 1,754,247    
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   1,729    
Loans [Member] | Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans: Individually evaluated for impairment 2,250 7,019    
Loans: Collectively evaluated for impairment 1,071,199 798,454    
Total ending loans balance 1,073,449 807,202    
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   1,729    
Loans [Member] | Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans: Collectively evaluated for impairment 533,399 438,454    
Total ending loans balance 533,399 438,454    
Loans [Member] | Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans: Collectively evaluated for impairment 399,676 363,419    
Total ending loans balance 399,676 363,419    
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Collectively evaluated for impairment 1,254 1,007    
Total ending allowance balance 1,254 1,007    
Mortgage Warehousing [Member] | Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans: Collectively evaluated for impairment 136,207 145,172    
Total ending loans balance $ 136,207 $ 145,172