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Loans and Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of loan portfolio as commercial loan 80.30%    
Risk rated loans $ 1,000    
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 $ 10,700   $ 10,600
Amount drawn from loans and other extensions of credit granted 6,700   6,800
Commercial loans held-for-sale 6,850   17,585
Mortgage loans held-for-sale 70,300   $ 61,600
Loans sold 286,700 $ 193,800  
Gain on mortgage loans sold, net $ 8,583 $ 4,878  
Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of credit exposure to risk based capital 84.20%   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 264.10%   268.30%