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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of contracts     0 0  
Percentage of loan portfolio as commercial loan 79.50%   79.50%    
Risk rated loans $ 1,000,000.0   $ 1,000,000.0    
Average balance of impaired loans 73,649,000 $ 82,346,000 81,612,000 $ 73,284,000  
Cash payments received on nonaccrual loans 0 84,000 176,000 337,000  
Nonaccrual loans 1,300,000 1,100,000 3,500,000 2,800,000  
Loan losses, allowance 93,647,000   93,647,000   $ 83,575,000
Troubled debt restructurings performing as of restructure date $ 5,800,000   $ 5,800,000   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 $ 10,700,000   $ 10,700,000   37,900,000
Amount drawn from loans and other extensions of credit granted 6,600,000   6,600,000   18,300,000
Commercial loans held-for-sale 21,312,000   21,312,000   15,954,000
Mortgage loans held-for-sale 54,300,000   54,300,000   $ 31,800,000
Loans sold     788,100,000 917,900,000  
Gain on mortgage loans sold, net $ 7,400,000 $ 3,900,000 $ 18,300,000 $ 11,400,000  
Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of credit exposure to risk based capital 79.90%   79.90%   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 272.80%   272.80%   277.70%
Troubled Debt Restructurings          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan losses, allowance $ 0   $ 0   $ 0