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Loans and Allowance for Loan Losses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans $ 31,569,000 $ 73,836,000  
Financing Receivable, Nonaccrual, No Allowance 13,188,000 36,537,000  
Financing Receivable, 90 Days or More Past Due, Still Accruing $ 1,607,000 2,362,000  
Percentage of credit exposure to risk based capital 25.00%    
Loans and other extensions of credit granted to directors, executive officers, and their related entities $ 45,200,000 10,700,000  
Amount drawn from loans and other extensions of credit granted 14,500,000 6,800,000  
Commercial loans held-for-sale 17,685,000 31,200,000  
Mortgage loans held-for-sale 30,300,000 67,800,000  
Mortgage Loan Volumes Sold 1,600,000,000 1,800,000,000  
Gains on mortgage loans sold, net 32,424,000 60,042,000 $ 24,335,000
Loans 23,414,262,000 22,424,501,000  
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 0 176,000
Interest Lost on impaired loans 1,700,000 3,300,000 $ 3,000,000
Currently performing impaired loans 15,500,000 51,700,000  
Paycheck Protection Program      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 371,100,000 1,800,000,000  
Commercial Real Estate Owner Occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 2,694,000 10,231,000  
Financing Receivable, Nonaccrual, No Allowance 0 5,985,000  
Financing Receivable, 90 Days or More Past Due, Still Accruing 0 0  
Loans 3,048,822,000 2,802,227,000  
Commercial real estate non owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 1,404,000 5,219,000  
Financing Receivable, Nonaccrual, No Allowance 0 1,522,000  
Financing Receivable, 90 Days or More Past Due, Still Accruing $ 0 $ 0  
Percentage of credit exposure to risk based capital 234.10% 264.00%  
Loans $ 5,221,704,000 $ 5,203,384,000  
Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 10,264,000 22,191,000  
Financing Receivable, Nonaccrual, No Allowance 0 0  
Financing Receivable, 90 Days or More Past Due, Still Accruing 144,000 273,000  
Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 356,000 1,953,000  
Financing Receivable, Nonaccrual, No Allowance 0 0  
Financing Receivable, 90 Days or More Past Due, Still Accruing $ 0 $ 0  
Percentage of credit exposure to risk based capital 79.10% 89.00%  
Loans $ 2,903,017,000 $ 2,901,746,000  
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 16,849,000 34,238,000  
Financing Receivable, Nonaccrual, No Allowance 13,188,000 29,030,000  
Financing Receivable, 90 Days or More Past Due, Still Accruing 1,091,000 1,785,000  
Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 2,000 4,000  
Financing Receivable, Nonaccrual, No Allowance 0 0  
Financing Receivable, 90 Days or More Past Due, Still Accruing 372,000 304,000  
Loans $ 485,489,000 $ 379,515,000