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Loans and Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 22,897,935   $ 22,897,935   $ 22,424,501
Percentage of loan portfolio as commercial loan 76.50%   76.50%    
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 $ 8,800   $ 8,800   10,700
Amount drawn from loans and other extensions of credit granted 5,400   5,400   6,800
Commercial loans held-for-sale 25,843   25,843   31,200
Mortgage loans held-for-sale 37,300   37,300   67,800
Loans sold     941,300 $ 837,400  
Gain (Loss) on Sale of Mortgage Loans 6,700 $ 19,600 20,366 $ 28,202  
Paycheck Protection Program [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 1,400,000   $ 1,400,000   $ 1,800,000
Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of credit exposure to risk based capital 80.10%   80.10%   89.00%
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 248.80%   248.80%   264.00%