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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT BORROWINGS (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) subsidiary | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Number of insurance subsidiaries that are members of the FHLB | subsidiary | 3 |  |
Investment borrowings | $ 2,188.8 | $ 2,189.3 |
Interest expense on FHLB borrowings | 123.2 | $ 104.7 | $ 33.5
Federal Home Loan Bank Advances |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Federal home loan bank stock | 94.6 |  |
Federal home loan bank advances, collateral pledged | 2,790.1 |  |
Investment borrowings | 2,188.8 |  |
Federal Home Loan Bank Advances | Borrowings Due May 2025 at 4.773% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 21.8 |  |
Interest rate | 4.773% |  |
Federal Home Loan Bank Advances | Borrowings Due June 2025 at 2.940% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 17.5 |  |
Interest rate | 2.94% |  |
Federal Home Loan Bank Advances | Borrowings Due September 2025 at 4.720% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 125.0 |  |
Interest rate | 4.72% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2026 at 5.072% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 5.072% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2026 at 5.047% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 5.047% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2026 at 4.790% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 4.79% |  |
Federal Home Loan Bank Advances | Borrowings Due May 2026 at 4.796% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 5.0 |  |
Interest rate | 4.796% |  |
Federal Home Loan Bank Advances | Borrowings Due May 2026 at 4.680% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 21.8 |  |
Interest rate | 4.68% |  |
Federal Home Loan Bank Advances | Borrowings Due May 2026 at 4.640% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 4.64% |  |
Federal Home Loan Bank Advances | Borrowings Due November 2026 at 4.844% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 10.0 |  |
Interest rate | 4.844% |  |
Federal Home Loan Bank Advances | Borrowings Due December 2026 at 4.710% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 75.0 |  |
Interest rate | 4.71% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 4.928% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 75.0 |  |
Interest rate | 4.928% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 5.082% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 5.082% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 4.826% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 4.826% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 4.995% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 4.995% |  |
Federal Home Loan Bank Advances | Borrowings Due February 2027 at 4.906% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 4.906% |  |
Federal Home Loan Bank Advances | Borrowings Due April 2027 at 4.633% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 4.633% |  |
Federal Home Loan Bank Advances | Borrowings Due May 2027 at 4.643% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 4.643% |  |
Federal Home Loan Bank Advances | Borrowings Due June 2027 at 4.740% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 4.74% |  |
Federal Home Loan Bank Advances | Borrowings Due June 2027 at 4.963% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 10.0 |  |
Interest rate | 4.963% |  |
Federal Home Loan Bank Advances | Borrowings Due July 2027 at 4.786% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 15.5 |  |
Interest rate | 4.786% |  |
Federal Home Loan Bank Advances | Borrowings Due July 2027 at 5.003% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 5.003% |  |
Federal Home Loan Bank Advances | Borrowings Due July 2027 at 5.006% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 5.006% |  |
Federal Home Loan Bank Advances | Borrowings Due August 2027 at 5.093% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 5.093% |  |
Federal Home Loan Bank Advances | Borrowings Due September 2027 at 4.896% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 12.5 |  |
Interest rate | 4.896% |  |
Federal Home Loan Bank Advances | Borrowings Due November 2027 at 4.800% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 57.7 |  |
Interest rate | 4.80% |  |
Federal Home Loan Bank Advances | Borrowings Due December 2027 at 5.009% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 5.009% |  |
Federal Home Loan Bank Advances | Borrowings Due December 2027 at 4.946% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 4.946% |  |
Federal Home Loan Bank Advances | Borrowings Due December 2027 at 4.796% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 4.796% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2028 at 4.833% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 75.0 |  |
Interest rate | 4.833% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2028 at 5.122% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 5.122% |  |
Federal Home Loan Bank Advances | Borrowings Due January 2028 at 5.049% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 50.0 |  |
Interest rate | 5.049% |  |
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.953% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 34.5 |  |
Interest rate | 4.953% |  |
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.996% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 4.996% |  |
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.985% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 22.0 |  |
Interest rate | 4.985% |  |
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.969% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 21.0 |  |
Interest rate | 4.969% |  |
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.926% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 100.0 |  |
Interest rate | 4.926% |  |
Federal Home Loan Bank Advances | Borrowings Due July 2028 at 4.816% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 27.0 |  |
Interest rate | 4.816% |  |
Federal Home Loan Bank Advances | Borrowings Due July 2028 at 4.750% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 15.0 |  |
Interest rate | 4.75% |  |
Federal Home Loan Bank Advances | Borrowings Due August 2028 at 4.760% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 35.0 |  |
Interest rate | 4.76% |  |
Federal Home Loan Bank Advances | Borrowings Due September 2028 at 4.992% |  |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |  |
Investment borrowings | $ 12.5 |  |
Interest rate | 4.992% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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