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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, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Individually evaluated for impairment          
Allowance For Loan Losses, Loans acquired with deteriorated credit quality          
Total ending allowance balance 18,305 $ 17,821 $ 17,820 $ 17,071 $ 16,474 $ 16,394
Loans: Individually evaluated for impairment          
Loans acquired with deteriorated credit quality          
Total ending loans balance 8,641     $ 8,999    
Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Individually evaluated for impairment 787   1,035      
Allowance For Loan Losses, Collectively evaluated for impairment 17,518   16,785      
Total ending allowance balance 18,305   17,820      
Commercial [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Individually evaluated for impairment 787   1,035      
Allowance For Loan Losses, Collectively evaluated for impairment 11,094   9,460      
Total ending allowance balance 11,881   10,495      
Real Estate [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Collectively evaluated for impairment 1,732   1,676      
Total ending allowance balance 1,732   1,676      
Consumer [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Collectively evaluated for impairment 3,652   4,643      
Total ending allowance balance 3,652   4,643      
Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Individually evaluated for impairment 8,641   6,708      
Loans: Collectively evaluated for impairment 3,665,173   3,010,063      
Total ending loans balance 3,673,814   3,016,771      
Loans [Member] | Commercial [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Individually evaluated for impairment 8,641   6,708      
Loans: Collectively evaluated for impairment 2,058,892   1,718,661      
Total ending loans balance 2,067,533   1,725,369      
Loans [Member] | Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Collectively evaluated for impairment 821,216   670,166      
Total ending loans balance 821,216   670,166      
Loans [Member] | Consumer [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Collectively evaluated for impairment 651,637   547,116      
Total ending loans balance 651,637   547,116      
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance For Loan Losses, Collectively evaluated for impairment 1,040   1,006      
Total ending allowance balance 1,040   1,006      
Mortgage Warehousing [Member] | Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans: Collectively evaluated for impairment 133,428   74,120      
Total ending loans balance $ 133,428   $ 74,120