v3.26.1
INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 2,941.7 $ 2,441.7
Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings 2,941.7  
Borrowings Due November 2026 at 4.094% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 10.0  
Interest rate 4.094%  
Borrowings Due December 2026 at 4.092% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 75.0  
Interest rate 4.092%  
Borrowings Due January 2027 at 4.046% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 75.0  
Interest rate 4.046%  
Borrowings Due January 2027 at 4.125% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.125%  
Borrowings Due January 2027 at 4.150% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.15%  
Borrowings Due February 2027 at 4.095% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.095%  
Borrowings Due April 2027 Rate at 4.008% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.008%  
Borrowings Due May 2027 Rate at 4.018% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.018%  
Borrowings Due June 2027 at 3.009% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 3.99%  
Borrowings Due June 2027 at 4.213% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 10.0  
Interest rate 4.213%  
Borrowings Due July 2027 at 4.177% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 15.5  
Interest rate 4.177%  
Borrowings Due July 2027 at 4.378% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.378%  
Borrowings Due September 2027 at 4.146% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 12.5  
Interest rate 4.146%  
Borrowings Due November 2027 Rate at 4.142% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 57.7  
Interest rate 4.142%  
Borrowings Due December 2027 at 4.138% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.138%  
Borrowings Due December 2027 at 4.135% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.135%  
Borrowings Due December 2027 at 4.187% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.187%  
Borrowings Due January 2028 at 4.103% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 75.0  
Interest rate 4.103%  
Borrowings Due January 2028 at 4.093% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 134.5  
Interest rate 4.093%  
Borrowings Due January 2028 at 4.165% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.165%  
Borrowings Due January 2028 at 4.178% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.178%  
Borrowings Due January 2028 at 4.110% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.11%  
Borrowings Due February 2028 at 4.160% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.16%  
Borrowings Due February 2028 at 4.098% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 21.0  
Interest rate 4.098%  
Borrowings Due February 2028 at 4.149% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 22.0  
Interest rate 4.149%  
Borrowings Due February 2028 at 4.115% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.115%  
Borrowings Due July 2028 at 4.207% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 27.0  
Interest rate 4.207%  
Borrowings Due July 2028 at 4.000% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 15.0  
Interest rate 4.00%  
Borrowings Due August 2028 at 4.010% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 35.0  
Interest rate 4.01%  
Borrowings Due September 2028 at 4.242% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 12.5  
Interest rate 4.242%  
Borrowings Due May 2029 at 4.263% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 42.2  
Interest rate 4.263%  
Borrowings Due August 2029 Rate at 4.297% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.297%  
Borrowings Due April 2030 at 4.320% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.32%  
Borrowings Due May 2030 Rate at 4.328% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.328%  
Borrowings Due May 2030 at 4.280% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.28%  
Borrowings Due May 2030 at 4.289% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.289%  
Borrowings Due September 2030 at 4.120% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 125.0  
Interest rate 4.12%  
Borrowings Due January 2031 at 4.178% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.178%  
Borrowings Due January 2031 at 4.160% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.16%  
Borrowings Due January 2031 at 4.179% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.179%  
Borrowings Due February 2031 at 4.246% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 150.0  
Interest rate 4.246%  
Borrowings Due February 2031 at 4.240% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.24%  
Borrowings Due April 2031 Rate at 4.238% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.238%  
Borrowings Due April 2031 Rate at 4.228% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.228%  
Borrowings Due April 2031 Rate at 4.253% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.253%  
Borrowings Due April 2031 Rate at 232% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 100.0  
Interest rate 4.232%  
Borrowings Due May 2031 Rate at 4.057% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 5.0  
Interest rate 4.057%  
Borrowings Due May 2031 Rate at 4.200% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 21.8  
Interest rate 4.20%  
Borrowings Due May 2031 Rate at 4.142% | Federal Home Loan Bank Advances    
Debt and Equity Securities, FV-NI [Line Items]    
Investment borrowings $ 50.0  
Interest rate 4.142%