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FAIR VALUE MEASUREMENTS - Fair Value of Certain Investments Based on NAV (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
NAV $ 88,962 $ 64,968
Unfunded Commitments 5,547 5,455
Hedge funds    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
NAV $ 44,022 $ 29,259
Hedge funds | Minimum    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days 30 days
Hedge funds | Maximum    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 60 days 60 days
Hedge funds | Monthly    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments redeemable (as percent) 73.00% 68.00%
Hedge funds | Quarterly    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments redeemable (as percent) 27.00% 32.00%
Other    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
NAV $ 654 $ 615
Other | Minimum    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days 30 days
Other | Maximum    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days 30 days
Other | Monthly    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments redeemable (as percent) 95.00% 95.00%
Other | Daily    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments redeemable (as percent) 5.00% 5.00%
Debt    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
NAV $ 4 $ 4
Redemption Notice Period 30 days 30 days
Debt | Daily    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments redeemable (as percent) 100.00% 100.00%
Equity    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
NAV $ 42 $ 40
Equity | Minimum    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days 30 days
Equity | Maximum    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 60 days 60 days
Equity | Monthly    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments redeemable (as percent) 33.00% 35.00%
Equity | Annually    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments redeemable (as percent) 67.00% 65.00%
Private equity | Equity growth    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
NAV $ 44,240 $ 35,050
Unfunded Commitments $ 5,547 $ 5,455
Fair value not redeemable (as percent) 100.00% 100.00%
Private equity | Consolidated But Not Owned    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 10,206 $ 8,003