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Long-Term Borrowings and Subordinated Debt - Narrative (Details)
Dec. 31, 2021
USD ($)
private_placement
Dec. 31, 2020
USD ($)
Debt Disclosure [Abstract]    
Long-term borrowings at FHLB $ 22,400,000 $ 23,700,000
Loans pledged as collateral at FHLB 4,000,000,000  
Maximum eligible borrowing based on qualifying collateral at FHLB 2,500,000,000  
Maximum borrowing capacity at FHLB $ 2,800,000,000  
Number of completed private placements of trust preferred securities | private_placement 3  
Percentage of equity owned 100.00%