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Long-Term Borrowings (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
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%