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Loans and Allowance for Loan Losses (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
contract
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
contract
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Interest income on non-accrual loans outstanding $ 4,800,000 $ 1,200,000 $ 14,700,000 $ 6,600,000        
Interest income, cash basis method 3,200,000 1,300,000 12,600,000 2,200,000        
Total loans 43,679,910,000   $ 43,679,910,000     $ 43,716,353,000    
Land held for future development, period     1 year          
Allowance for loan losses 477,532,000 421,359,000 $ 477,532,000 421,359,000 $ 471,238,000 443,424,000 $ 407,837,000 $ 427,597,000
Reserve for unfunded commitments 55,200,000   55,200,000     57,500,000    
All financing receivable, allowance for credit loss $ 532,700,000   532,700,000     500,900,000    
Increase in allowance for credit loss     $ 31,800,000          
ACL to loans ratio (as percent) 1.22%   1.22%          
Increase in ACL to loans ratio     0.0007          
Allowance for credit loss, reasonable and supportable forecast period (in year)     2 years          
Allowance for credit loss, straight-line basis historical period (in year)     1 year          
Allowance for credit loss, measurement input, estimated peak weighted average unemployment rate 5.00%   5.00%          
FDMs, subsequent default   $ 109,000   $ 539,000        
Number of contracts | contract   1   4        
Commitments to land additional funds to TDRs           0    
Total consumer                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Charge-off of previously established reserves for credit losses associated with the transfer to held for sale $ 23,300,000   $ 31,300,000          
Reclassification to held-for-sale 1,170,000,000   1,590,000,000          
Allowance for loan losses 134,702,000 $ 140,731,000 $ 134,702,000 $ 140,731,000 $ 141,525,000 138,299,000 $ 143,611,000 $ 141,473,000
Substandard                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan substandard period (in days)     90 days          
Loss                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan charge off (in days)     120 days          
Asset Pledged as Collateral                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans $ 22,990,000,000   $ 22,990,000,000     $ 16,090,000,000.00