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BORROWINGS - FHLB and FRB Advances (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
FHLB advances $ 1,105,000  
Amount    
2024 0  
2025 200,000  
2026 200,000  
2027 450,000  
2028 180,000  
Thereafter 75,000  
FHLB advances $ 1,105,000  
Rate    
2024 0  
2025 4.45%  
2026 4.32%  
2027 3.70%  
2028 4.75%  
Thereafter 5.55%  
Total maximum borrowing capacity with the FHLB $ 3,565,068 $ 3,474,347
Total maximum borrowing capacity with the FRB 4,180,824 3,436,000
Qualifying loans and securities serving as collateral against FHLB and FRB advances 12,496,815 11,889,120
Qualifying Assets Pledged as Collateral    
Rate    
Qualifying loans and securities serving as collateral against FHLB and FRB advances 9,508,135 8,575,137
FHLB advances    
Debt Instrument [Line Items]    
Total long-term debt $ 1,117,229 $ 1,203,207
FHLB advances, rate 4.24% 3.91%
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB $ 12,200 $ 3,200
FHLB Advance Due March 2028    
Debt Instrument [Line Items]    
FHLB advances 950,000  
Amount    
FHLB advances 950,000  
FHLB Advance Due June 2029    
Debt Instrument [Line Items]    
FHLB advances 155,000  
Amount    
FHLB advances $ 155,000