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Loans and Allowance for Loan Losses - Textual (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 14,374,277,000   $ 14,425,704,000
Premiums and discounts associated with acquired loans 72,400,000 $ 91,600,000  
Financing receivable, accrued interest excluded from amortized costs 47,000,000.0   48,900,000
Nonaccrual loans with no allowance for credit loss $ 22,400,000    
Troubled debt, number of contracts 0 0  
Foreclosed assets and other real estate owned $ 20,805,000   19,121,000
Financing receivable, collateral dependent, amount 75,670,000    
Unfunded commitments, allowance for credit loss 29,400,000   8,400,000
(Benefit) provision for credit losses on unfunded commitments (3,000,000) $ 300,000  
Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans in process of foreclosure, amount 5,301,000   5,789,000
Energy      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, collateral dependent, amount 43,573,000    
Increase in specific provisions 22,000,000    
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Foreclosed assets and other real estate owned 2,672,000   4,458,000
Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 10,833,765,000   $ 11,021,940,000
Real Estate | OREO Received in Full or Partial Satisfaction of Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance prior to TDR $ 0    
Commercial Real Estate | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans with subsequent default | loan 0 1  
Write-down of impaired loans   $ 138,000