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BORROWINGS - FHLB and FRB Advances (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
FHLB advances $ 1,090,000  
Amount    
2025 100,000  
2026 250,000  
2027 560,000  
2028 180,000  
2029 0  
Thereafter 0  
FHLB advances $ 1,090,000  
Rate    
2025 0.0442  
2026 4.43%  
2027 3.93%  
2028 4.55%  
2029 0.00%  
Thereafter 0.00%  
Total maximum borrowing capacity with the FHLB $ 3,819,412 $ 3,562,171
Total maximum borrowing capacity with the FRB 4,134,678 4,357,519
Qualifying loans and securities serving as collateral against FHLB and FRB 13,708,767 13,104,883
Qualifying Assets Pledged as Collateral    
Rate    
Qualifying loans and securities serving as collateral against FHLB and FRB 9,471,384 9,722,736
FHLB advances    
Debt Instrument [Line Items]    
Total long-term debt $ 1,095,377 $ 1,028,352
Rate 4.19% 4.11%
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB $ 5,400 $ (1,600)
FHLB Advance Due March 2028    
Debt Instrument [Line Items]    
FHLB advances 850,000  
Amount    
FHLB advances 850,000  
FHLB Advance Due December 2028    
Debt Instrument [Line Items]    
FHLB advances 240,000 240,000
Amount    
FHLB advances $ 240,000 $ 240,000