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Long-Term Borrowings (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Debt Instrument [Line Items]  
Debt extinguishment costs $ 32,200,000
Payments of FHLBank Borrowings, Financing Activities 536,000,000.0
Prepayment Fees on Advances, Net 20,900,000
Debt extinguishment costs 841,000
Subordinated Debt | November 2024 Subordinated Debt  
Debt Instrument [Line Items]  
Debt instrument, repurchase amount $ 75,000,000.0
Debt instrument, interest rate (as a percent) 4.50%
Debt instrument, effective rate (as a percent) 4.87%
Debt extinguishment costs $ 11,300,000
Senior Notes  
Debt Instrument [Line Items]  
Debt instrument, repurchase amount $ 60,000,000.0
Debt instrument, interest rate (as a percent) 3.60%
Debt instrument, effective rate (as a percent) 3.95%