v3.26.1
BORROWINGS - FHLB and FRB Advances (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
FHLB advances $ 1,560,000  
Amount    
2026 100,000  
2027 860,000  
2028 180,000  
2029 0  
2030 240,000  
Thereafter 180,000  
FHLB advances $ 1,560,000  
Rate    
2026 0.0428  
2027 3.89%  
2028 4.21%  
2029 0.00%  
2030 4.21%  
Thereafter 4.20%  
Total maximum borrowing capacity with the FHLB $ 4,929,018 $ 4,639,436
Total maximum borrowing capacity with the FRB 4,733,517 4,742,290
Qualifying loans and securities serving as collateral against FHLB and FRB 15,515,314 15,036,672
Qualifying Assets Pledged as Collateral    
Rate    
Qualifying loans and securities serving as collateral against FHLB and FRB 11,534,965 11,200,653
FHLB Advance Due March 2028    
Debt Instrument [Line Items]    
FHLB advances 650,000  
Amount    
FHLB advances 650,000  
FHLB Advance Due December 2028    
Debt Instrument [Line Items]    
FHLB advances 910,000 910,000
Amount    
FHLB advances 910,000 910,000
FHLB advances    
Debt Instrument [Line Items]    
Total long-term debt $ 1,561,655 $ 1,325,068
Rate 4.03% 4.04%
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB $ 1,700 $ 5,100