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Loans and Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of loan portfolio as commercial loan 82.50%   82.50%    
Risk rated loans $ 1,000   $ 1,000    
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 $ 11,100   $ 11,100   $ 10,600
Amount drawn from loans and other extensions of credit granted 7,100   7,100   6,800
Commercial loans held-for-sale 16,201   16,201   17,585
Mortgage loans held-for-sale 53,700   53,700   $ 61,600
Loans sold     837,400 $ 485,600  
Gain (Loss) on Sale of Mortgage Loans $ 19,600 $ 6,000 $ 28,202 $ 10,889  
Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of credit exposure to risk based capital 83.60%   83.60%   83.60%
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 275.00%   275.00%   268.30%