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Loans and Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 24,499,022   $ 23,414,262
Percentage of loan portfolio as commercial loan 77.70%    
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 $ 45,300   45,200
Amount drawn from loans and other extensions of credit granted 28,900   14,500
Commercial loans held-for-sale 35,383   17,685
Mortgage loans held-for-sale 33,600   30,300
Loans sold 270,800 $ 547,000  
Gain (Loss) on Sale of Mortgage Loans 4,066 $ 13,666  
Paycheck Protection Program [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 157,200   $ 371,100
Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of credit exposure to risk based capital 87.40%   79.10%
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 243.70%   234.10%