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Other Debt - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Maximum percentage of the total assets that can be borrowed from the FHLB by the entity 45.00%  
Federal Home Loan Bank, Advances, Weighted Average Interest Rate (as a percent) 1.19%  
Federal Reserve Bank Advances    
Debt Instrument [Line Items]    
Undrawn line of credit with the FHLB or FRB $ 427,900,000  
Federal Home Loan Bank Advance    
Debt Instrument [Line Items]    
Other Debt 50,000,000 $ 75,000,000
Undrawn line of credit with the FHLB or FRB $ 2,800,000,000  
Finance Lease Obligations    
Debt Instrument [Line Items]    
Lease term (in years) 60 years  
Fixed lease payments through December 2022 $ 800,000