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Borrowings - Narrative (Details)
9 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]      
Percent of assets 25.00%    
Maximum borrowing capacity $ 4,520,000,000   $ 4,450,000,000
Percent outstanding advances 100.00%    
FHLB and FRB borrowings $ 700,000,000   300,000,000
Proceeds from FHLB advances 23,650,885,000 $ 1,540,000,000  
FHLB and FRB borrowings 1,072,000,000   300,000,000
Other Borrowings 0   0
Remaining borrowing capacity 3,810,000,000    
FHLB Advances      
Debt Instrument [Line Items]      
Loans pledged as collateral $ 0   $ 0
Weighted Average      
Debt Instrument [Line Items]      
FHLB advances, interest rate 3.04%   0.92%
Minimum      
Debt Instrument [Line Items]      
FHLB advances, interest rate 2.39%    
Maximum      
Debt Instrument [Line Items]      
FHLB advances, interest rate 3.22%    
Qualifying Loans      
Debt Instrument [Line Items]      
Asset balance used to determine maximum borrowing capacity from federal reserve bank $ 923,200,000    
FRB Discount Window      
Debt Instrument [Line Items]      
Advances from Federal Reserve Bank $ 372,000,000   $ 0
Percent of qualifying assets (up to) 99.00%    
Number of securities pledged as collateral | security 1    
Securities pledged as collateral $ 1,100,000    
Total available borrowing capacity $ 420,600,000   606,600,000
Interest rate at period end 3.25%    
Unsecured Credit Facility with FHLB      
Debt Instrument [Line Items]      
Unsecured credit facility, maximum borrowing capacity $ 81,200,000   81,200,000
Mortgage Loans on Real Estate      
Debt Instrument [Line Items]      
Pledged as collateral, FHLB $ 7,850,000,000   $ 6,960,000,000