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Allowance for Credit Losses (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
contract
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
contract
Jun. 30, 2022
USD ($)
contract
Dec. 31, 2022
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]            
Accrued interest related to financial assets held at amortized cost $ 267,300,000 $ 130,900,000 $ 267,300,000 $ 130,900,000 $ 130,900,000 $ 214,000,000
Financial Asset, Amortized Cost, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable and other Accrued interest receivable and other Accrued interest receivable and other Accrued interest receivable and other Accrued interest receivable and other Accrued interest receivable and other
Nonaccrual loans with no related allowance for credit losses $ 23,500,000   $ 23,500,000      
Provision for credit losses 28,571,000 $ 20,493,000 51,641,000 $ 24,518,000    
Loan net charge-offs 17,000,000.0 $ 22,500,000 17,000,000.0 $ 22,500,000    
Provision for credit losses (57,000)   (82,000)      
Foreclosed residential real estate properties 318,000   318,000      
TDRs, count | contract   16   29 57  
TDRs, balance   $ 2,421,000   $ 5,518,000 $ 13,061,000  
Weighted average extension term   63 months        
Weighted average decrease in stated interest rate   0.96%        
Loan forgiveness   $ 0        
Financing Receivable | Residential Real Estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Recorded investment, foreclosure proceedings in process $ 50,400,000 $ 10,900,000 $ 50,400,000 $ 10,900,000 $ 10,900,000