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Loans - Summary of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 2,816,464 $ 2,674,943    
Deferred loan fees, net 4,020 2,544    
Total loans 2,812,444 2,672,399    
Allowance for loan losses 45,436 23,451 $ 21,247 $ 16,553
Net loans 2,767,008 2,648,948    
Construction and Land Development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 591,541 584,440    
Allowance for loan losses 4,847 4,743 3,802 3,776
Commercial Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 993,912 805,260    
Allowance for loan losses 8,113 6,725 5,981 4,266
Commercial Real Estate | Nonfarm, nonresidential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 944,021 754,243    
Commercial Real Estate | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 49,891 51,017    
Residential Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 643,601 682,882    
Allowance for loan losses 4,462 4,743 3,834 2,398
Residential Real Estate | Closed-end 1-4 family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 455,920 493,065    
Residential Real Estate | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 187,681 189,817    
Commercial and Industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 582,641 596,793    
Allowance for loan losses 27,957 7,166 7,587 6,068
Consumer and Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 4,769 5,568    
Allowance for loan losses $ 57 $ 74 $ 43 $ 45