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Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Jul. 01, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total ending allowance balance $ 16,168 $ 16,421 $ 16,501 $ 16,160 $ 15,660 $ 15,992
Total ending loans balance 10,848     8,497    
Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Individually evaluated for impairment 1,599     1,589    
Allowance For Loan Losses, Collectively evaluated for impairment 14,315     14,418    
Total ending allowance balance 16,168     16,501    
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     494    
Commercial [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Individually evaluated for impairment 1,599     1,589    
Allowance For Loan Losses, Collectively evaluated for impairment 6,989     5,827    
Total ending allowance balance 8,842     7,910    
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     494    
Real Estate [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Collectively evaluated for impairment 2,297     2,508    
Total ending allowance balance 2,297     2,508    
Consumer [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Collectively evaluated for impairment 4,014     4,951    
Total ending allowance balance 4,014     4,951    
Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Individually evaluated for impairment 10,848     11,055    
Loans: Collectively evaluated for impairment 1,721,370     1,370,740    
Total ending loans balance 1,733,947     1,382,386    
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     591    
Loans [Member] | Commercial [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Individually evaluated for impairment 10,848     11,055    
Loans: Collectively evaluated for impairment 787,245     664,251    
Total ending loans balance 799,822     675,897    
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     591    
Loans [Member] | Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Collectively evaluated for impairment 432,283     255,383    
Total ending loans balance 432,283     255,383    
Loans [Member] | Consumer [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Collectively evaluated for impairment 362,388     321,470    
Total ending loans balance 362,388     321,470    
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Collectively evaluated for impairment 1,015     1,132    
Total ending allowance balance 1,015     1,132    
Mortgage Warehousing [Member] | Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Collectively evaluated for impairment 139,454     129,636    
Total ending loans balance $ 139,454     $ 129,636