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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
FHLB and FRB borrowings $ 239,000 $ 1,795,726
Percent of assets 25.00%  
Percent outstanding advances 100.00%  
Total available borrowing capacity $ 5,961,266 5,022,035
Line of Credit Facility, Current Borrowing Capacity 6,200,266 6,817,761
Short-Term Debt $ 239,000 $ 1,795,726
Debt, Weighted Average Interest Rate 4.66% 4.54%
Unsecured Credit Facility with FHLB    
Debt Instrument [Line Items]    
FHLB and FRB borrowings $ 0 $ 0
Federal Home Loan Bank Certificates and Obligations (FHLB)    
Debt Instrument [Line Items]    
Total available borrowing capacity 4,051,408  
Line of Credit Facility, Current Borrowing Capacity 4,151,408  
Short-Term Debt $ 100,000  
Debt, Weighted Average Interest Rate 4.88%  
Federal Reserve Bank, Discount Window1    
Debt Instrument [Line Items]    
Total available borrowing capacity $ 1,592,467 630,369
Line of Credit Facility, Current Borrowing Capacity 1,731,467 630,369
Short-Term Debt $ 139,000 $ 0
Debt, Weighted Average Interest Rate 4.50% 0.00%
Federal Reserve Bank, Bank Term Funding Program (BTFP)    
Debt Instrument [Line Items]    
Total available borrowing capacity   $ 12,183
Line of Credit Facility, Current Borrowing Capacity   1,707,909
Short-Term Debt   $ 1,695,726
Debt, Weighted Average Interest Rate   4.47%
Unsecured Credit Facility with FHLB    
Debt Instrument [Line Items]    
Total available borrowing capacity $ 317,391 $ 312,315
Line of Credit Facility, Current Borrowing Capacity 317,391 312,315
Short-Term Debt $ 0 $ 0
Debt, Weighted Average Interest Rate 0.00% 0.00%
Federal Reserve Bank Advances    
Debt Instrument [Line Items]    
Total available borrowing capacity   $ 4,067,168
Line of Credit Facility, Current Borrowing Capacity   4,167,168
Short-Term Debt   $ 100,000
Debt, Weighted Average Interest Rate   5.73%
Qualifying Loans    
Debt Instrument [Line Items]    
Asset balance used to determine maximum borrowing capacity from federal reserve bank $ 1,980,000  
FRB Discount Window    
Debt Instrument [Line Items]    
Percent of qualifying assets (up to) 99.00%  
Securities pledged as collateral $ 0  
Mortgage Loans on Real Estate    
Debt Instrument [Line Items]    
Pledged as collateral, FHLB 7,580,000 $ 7,600,000
Pledged as collateral, excluding FHLB $ 0