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Long-Term Borrowings (Details) - USD ($)
3 Months Ended
Mar. 16, 2022
Mar. 31, 2021
Debt Instrument [Line Items]    
Debt extinguishment costs   $ 800,000
Payments of FHLBank Borrowings, Financing Activities   536,000,000
Prepayment Fees on Advances, Net   20,900,000
Subordinated Debt | November 2024 Subordinated Debt    
Debt Instrument [Line Items]    
Debt instrument, repurchase amount   75,000,000
Debt extinguishment costs   11,300,000
Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, repurchase amount   $ 60,000,000
Senior Notes | 3.60% Senior Notes    
Debt Instrument [Line Items]    
Repayments of senior debt $ 65,000,000  
Debt instrument, interest rate (as a percent) 3.60%