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Loans - Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) $ 17,700        
Loans and Leases Receivable, Deferred Income 4,200        
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 2,700,000   $ 2,500,000    
Financing Receivable, Paycheck Protection Program 754,400   709,900    
Financing Receivable, Paycheck Protection Program, Net of Deferred Fees 737,700        
Financing Receivable, Paycheck Protection Program, Unearned Fees 16,700        
financing receivable, paycheck protection program, net of deferred fees     698,600    
financing recievable, paycheck protection program, unearned fees     11,300    
net premium, acquired loans     16,100    
Financing Receivable, Amount Still in Deferral Status 21,100        
Other Assets [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable 30,700        
Non-Covered Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Post-Modification Outstanding Recorded Balance   $ 3,886      
Financing Receivable, Modifications, Number of Contracts | loan   3      
Restructuring Reserve 3,320   3,559    
Financing Receivable, before Allowance for Credit Loss 7,308,905   7,241,074    
Financing receivable, allowance for credit loss 131,527 $ 92,187 136,671 $ 69,995 $ 43,288
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, allowance for credit loss 19,700        
Non-Covered Loans | Other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Restructuring Reserve 0   0    
Financing Receivable, before Allowance for Credit Loss 212,068   187,083    
Financing receivable, allowance for credit loss 3,400 $ 1,547 $ 2,787 $ 1,050 $ 1,134
Non-Covered Loans | Agriculture Portfolio Niche Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, allowance for credit loss 19,000        
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, allowance for credit loss $ 5,400