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Loans and Allowance for Loan Losses (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2020
USD ($)
contract
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2020
USD ($)
contract
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and leases receivable, impaired, interest lost on nonaccrual loans $ 4,100,000 $ 4,300,000 $ 10,100,000 $ 9,200,000        
Interest income, cash basis method 454,000 1,300,000 1,600,000 2,700,000        
Loans pledged as collateral 14,290,000,000   14,290,000,000     $ 15,050,000,000.00    
Total loans 38,341,030,000   38,341,030,000     38,252,984,000    
Allowance for loan losses 492,243,000 603,800,000 492,243,000 603,800,000 $ 516,708,000 605,736,000 $ 588,648,000 $ 281,402,000
Reserve for unfunded commitments 43,000,000   43,000,000          
All financing receivable, allowance for credit loss $ 535,200,000   535,200,000          
Allowance for credit loss, decrease     $ (118,300,000)          
ACL to loans ratio 1.40%   1.40%          
Allowance for credit loss, reasonable and supportable forecast period     2 years          
Allowance for credit loss, straight-line basis historical period     1 year          
Downside bias 4500.00%   4500.00%   40.00%      
Estimated unemployment rate 460.00%   460.00%   4.50%      
(Reversal of) provision for credit losses $ (7,868,000) 43,383,000 $ (51,041,000) 343,956,000        
Net chargeoff amount 20,500,000   67,300,000          
Financing receivable, allowance for credit loss, period increase (decrease) from increase in size of loan profile 10,000,000   35,800,000          
Financing receivable, purchase 453,300,000   1,490,000,000          
Recorded investment 15,229,000 $ 8,144,000 37,504,000 $ 60,492,000        
Commitments to land additional funds to TDRs $ 0   $ 0     0    
Troubled Debt Restructuring That Subsequently Defaults                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of contracts | contract 2 1 7 5        
Recorded investment $ 536,000 $ 21,000 $ 708,000 $ 666,000        
Substandard                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan substandard period (in days)     90 days          
Loss and Charged Off                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan charge off (in days)     120 days          
Total commercial and industrial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans 18,934,788,000   $ 18,934,788,000     $ 19,520,168,000    
Recorded investment 9,036,000 $ 5,758,000 20,583,000 $ 18,346,000        
Total commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans $ 782,200,000   $ 782,200,000