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Loans and Allowance for Loan Leases - Categories of Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 4,011,169 $ 3,861,707    
Less: Allowance for loan losses 51,458 56,896 $ 40,001 $ 37,826
Less: Net deferred loan fees and costs 8,718 9,463    
Net loans 3,950,993 3,795,348    
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,355,723 1,356,817    
Less: Allowance for loan losses 21,129 35,864 20,506 16,584
Energy        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 398,797 408,573    
Less: Allowance for loan losses 7,599 6,565 7,090 10,262
Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,084,684 1,024,041    
Less: Allowance for loan losses 12,623 8,085 7,471 6,755
Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 625,145 628,418    
Less: Allowance for loan losses 5,021 3,516 2,585 2,475
Residential real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 503,702 398,695    
Less: Allowance for loan losses 4,687 2,546 2,047 1,464
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 43,118 45,163    
Less: Allowance for loan losses $ 399 $ 320 $ 302 $ 286