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Borrowings - FHLB and FRB Advances (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
FHLB advances $ 1,200,000  
Amount    
2024 250,000  
2025 200,000  
2026 200,000  
2027 450,000  
2028 100,000  
Thereafter 0  
FHLB advances $ 1,200,000  
Rate    
2024 3.44%  
2025 4.45%  
2026 4.32%  
2027 3.70%  
2028 4.19%  
Thereafter 0.00%  
Total maximum borrowing capacity with the FHLB $ 3,431,804 $ 3,474,347
Total maximum borrowing capacity with the FRB 4,082,885 3,436,000
Total consumer loans receivable 11,884,664 11,889,120
Qualifying Assets Pledged as Collateral    
Rate    
Total consumer loans receivable 9,339,657 8,575,137
FHLB advances    
Debt Instrument [Line Items]    
Total long-term debt $ 1,195,088 $ 1,203,207
FHLB advances, rate 3.91% 3.91%
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB $ (4,900) $ 3,200
FHLB Advance Due June 2024    
Debt Instrument [Line Items]    
FHLB advances 250,000  
Amount    
FHLB advances 250,000  
FHLB Advance Due March 2028    
Debt Instrument [Line Items]    
FHLB advances 950,000  
Amount    
FHLB advances $ 950,000