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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of contracts     0 0  
Percentage of loan portfolio as commercial loan 80.50%   80.50%    
Risk rated loans $ 1,000,000   $ 1,000,000    
Average balance of impaired loans 86,160,000 $ 75,149,000 85,155,000 $ 69,759,000  
Cash payments received on nonaccrual loans 89,000 153,000 176,000 253,000  
Nonaccrual loans 1,400,000 1,200,000 2,600,000 2,200,000  
Loan losses, allowance 90,253,000   90,253,000   $ 83,575,000
Troubled debt restructurings performing as of restructure date $ 7,400,000   $ 7,400,000   5,900,000
Percentage of credit exposure to risk based capital 25.00%   25.00%    
Loans and other extensions of credit granted to directors, executive officers, and their related entities $ 38,400,000   $ 38,400,000   37,900,000
Amount drawn from loans and other extensions of credit granted 19,600,000   19,600,000   18,300,000
Commercial loans held-for-sale 21,295,000   21,295,000   15,954,000
Mortgage loans held-for-sale 55,700,000   55,700,000   $ 31,800,000
Loans sold     485,600,000 636,700,000  
Gain on mortgage loans sold, net $ 6,000,000 $ 3,800,000 $ 10,900,000 $ 7,500,000  
Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of credit exposure to risk based capital 82.60%   82.60%   85.20%
Non-owner occupied commercial real estate and multifamily loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of credit exposure to risk based capital 288.90%   288.90%   277.70%
Troubled Debt Restructurings          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan losses, allowance $ 900,000   $ 900,000   $ 0