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Borrowings (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 16, 2022
Mar. 30, 2021
Sep. 30, 2022
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Jul. 01, 2022
Debt Instrument [Line Items]              
Repayments of senior debt and subordinated debt         $ 81,496,000 $ 703,681,000  
Debt extinguishment costs   $ 800,000          
Payments of FHLBank Borrowings, Financing Activities       $ 536,000,000      
Prepayment Fees on Advances, Net       $ 20,900,000      
Payments for repurchase of trust preferred debt     $ 17,000,000        
Prudential              
Debt Instrument [Line Items]              
Short-term borrowings             $ 284,000,000
Federal Home Loan Bank Advances | Prudential              
Debt Instrument [Line Items]              
Short-term borrowings             $ 253,500,000
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 and subordinated debt $ 65,000,000            
Debt instrument, interest rate (as a percent) 3.60%            
Subordinated Debt | November 2024 Subordinated Debt              
Debt Instrument [Line Items]              
Debt instrument, repurchase amount   75,000,000          
Debt extinguishment costs   $ 11,300,000