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INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 2,089.4 | $ 1,639.5
Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | 2,089.4 |
Borrowings due April 2024 at 5.628% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 5.628% |
Borrowings due May 2024 at 5.743% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 22.0 |
Interest rate | 5.743% |
Borrowings due July 2024 at 1.990% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 15.5 |
Interest rate | 1.99% |
Borrowings Due August 2024 at 0.640% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 27.0 |
Interest rate | 0.64% |
Borrowings due May 2025 at 5.728% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 21.7 |
Interest rate | 5.728% |
Borrowings Due June 2025 at 2.940% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 18.2 |
Interest rate | 2.94% |
Borrowings Due June 2025 at 5.880% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 12.5 |
Interest rate | 5.88% |
Borrowings due September 2025 at 5.660% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 125.0 |
Interest rate | 5.66% |
Borrowings due October 2025 at 5.878% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 5.878% |
Borrowings due October 2025 at 5.878% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 5.878% |
Borrowings due October 2025 at 5.843% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 57.7 |
Interest rate | 5.843% |
Borrowings due November 2025 at 5.854% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.854% |
Borrowings Due December 2025 at 5.896% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 12.5 |
Interest rate | 5.896% |
Borrowings due January 2026 at 5.808% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.808% |
Borrowings due January 2026 at 5.857% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.857% |
Borrowings due January 2026 at 5.803% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 5.803% |
Borrowings Due January 2026 at 5.977% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 15.0 |
Interest rate | 5.977% |
Borrowings due May 2026 at 5.693% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 21.8 |
Interest rate | 5.693% |
Borrowings due May 2026 at 5.580% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.58% |
Borrowings Due December 2026 at 5.767% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 75.0 |
Interest rate | 5.767% |
Borrowings Due January 2027 at 5.663% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 75.0 |
Interest rate | 5.663% |
Borrowings Due January 2027 at 5.758% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.758% |
Borrowings Due January 2027 at 5.813% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.813% |
Borrowings Due February 2027 at 5.788% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 5.788% |
Borrowings due April 2027 at 5.674% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.674% |
Borrowings due May 2027 at 5.684% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.684% |
Borrowings due June 2027 at 5.680% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 5.68% |
Borrowings due June 2027 at 5.903% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 10.0 |
Interest rate | 5.903% |
Borrowings Due July 2027 at 6.044% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 6.044% |
Borrowings Due July 2027 at 6.064% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 6.064% |
Borrowings Due August 2027 at 6.048% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 6.048% |
Borrowings Due January 2028 at 5.788% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 75.0 |
Interest rate | 5.788% |
Borrowings Due January 2028 at 5.798% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.798% |
Borrowings Due January 2028 at 5.868% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 50.0 |
Interest rate | 5.868% |
Borrowings Due February 2028 at 5.908% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 34.5 |
Interest rate | 5.908% |
Borrowings Due February 2028 at 5.788% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 21.0 |
Interest rate | 5.788% |
Borrowings Due February 2028 at 5.808% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 100.0 |
Interest rate | 5.808% |
Borrowings Due July 2028 at 5.690% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 15.0 |
Interest rate | 5.69% |
Borrowings Due August 2028 at 5.700% | Federal Home Loan Bank Advances |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment borrowings | $ 35.0 |
Interest rate | 5.70% |

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