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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total ending allowance balance $ 17,820 $ 16,394 $ 14,837 $ 14,534
Total ending loans balance 6,708 7,187 $ 2,250  
Loans Purchased With Evidence of Credit Deterioration [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total ending allowance balance 60      
Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Individually evaluated for impairment 1,035 184    
Allowance For Loan Losses, Collectively evaluated for impairment 16,785 16,210    
Total ending allowance balance 17,820 16,394    
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    
Commercial [Member] | Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Individually evaluated for impairment 1,035 184    
Allowance For Loan Losses, Collectively evaluated for impairment 9,460 8,909    
Total ending allowance balance 10,495 9,093    
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    
Real Estate [Member] | Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Collectively evaluated for impairment 1,676 2,188    
Total ending allowance balance 1,676 2,188    
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    
Consumer [Member] | Allowance for Loan Losses [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance For Loan Losses, Collectively evaluated for impairment 4,643 4,083    
Total ending allowance balance 4,643 4,083    
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    
Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans: Individually evaluated for impairment 6,708 7,187    
Loans: Collectively evaluated for impairment 3,010,063 2,834,286    
Total ending loans balance 3,016,771 2,841,473    
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 6,708 7,187    
Loans: Collectively evaluated for impairment 1,718,661 1,668,408    
Total ending loans balance 1,725,369 1,675,595    
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 670,166 612,114    
Total ending loans balance 670,166 612,114    
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 547,116 459,256    
Total ending loans balance 547,116 459,256    
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 1,006 1,030    
Total ending allowance balance 1,006 1,030    
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    
Mortgage Warehousing [Member] | Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans: Collectively evaluated for impairment 74,120 94,508    
Total ending loans balance 74,120 94,508    
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