Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) level3FinancialInstruments	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of Reportable Segments | level3FinancialInstruments			3
Revenues	$ 105,000	$ 62,000	$ 207,000	$ 120,000
Policyholder Benefits and Claims Incurred, Net	18,000	7,000	16,000	25,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	2,000	(11,000)	27,000	(40,000)
Provision for income taxes	2,000	2,000	7,000	6,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(1,000)	(13,000)	20,000	(46,000)
Premiums Earned, Net	33,000	15,000	66,000	29,000
Net Investment Income	36,000	35,000	78,000	69,000
Amortization of Intangible Assets	8,000	7,000	21,000	13,000
Interest Expense	16,000	16,000	32,000
Total assets	8,184,000	8,132,000	8,184,000	8,132,000	$ 8,428,000
Premiums Written, Net	34,000	(45,000)	62,000	(27,000)
Derivative, Gain (Loss) on Derivative, Net	0	0	2,000	(3,000)
Insurance Commissions and Fees	13,000	10,000	31,000	25,000
Losses and loss adjustment expenses (benefit)			16,000	25,000
Other Cost and Expense, Operating	47,000	36,000	82,000	72,000
Insurance Commissions	8,000	6,000	18,000	14,000
Depreciation	1,000	0	1,000	1,000
Benefits, Losses and Expenses	103,000	73,000	180,000	160,000
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	0	0	(1,000)	(1,000)
Net income attributable to common shareholders	(1,000)	(13,000)	19,000	(47,000)
Realized Investment Gains (Losses)	4,000	(3,000)	4,000	(8,000)
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	3,000	2,000	6,000	4,000
Other income Items	15,000	3,000	21,000	4,000
Deferred Policy Acquisition Costs, Amortization Expense	5,000	1,000	10,000	3,000
Financial Guarantee
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	53,000	39,000	107,000	71,000
Policyholder Benefits and Claims Incurred, Net	(5,000)	2,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	13,000	(8,000)	38,000	(40,000)
Premiums Earned, Net	6,000	8,000	13,000	14,000
Net Investment Income	32,000	32,000	70,000	63,000
Amortization of Intangible Assets	7,000	6,000	18,000	11,000
Interest Expense	16,000	16,000	32,000	32,000
Total assets	7,100,000	7,376,000	7,100,000	7,376,000
Derivative, Gain (Loss) on Derivative, Net	1,000	1,000	2,000	(3,000)
Losses and loss adjustment expenses (benefit)			(26,000)	15,000
Other Cost and Expense, Operating	22,000	23,000	44,000	52,000
Depreciation	0	0	0	1,000
Benefits, Losses and Expenses	40,000	47,000	69,000	111,000
Realized Investment Gains (Losses)	(1,000)	(3,000)	0	(8,000)
Other income Items	16,000	2,000	21,000	4,000
Deferred Policy Acquisition Costs, Amortization Expense	0	0	0	0
Specialty Property & Casualty Program
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	32,000	11,000	61,000	20,000
Policyholder Benefits and Claims Incurred, Net	23,000	6,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(1,000)	0	1,000	(1,000)
Premiums Earned, Net	27,000	8,000	53,000	15,000
Net Investment Income	1,000	1,000	3,000	2,000
Total assets	713,000	395,000	713,000	395,000
Losses and loss adjustment expenses (benefit)			42,000	10,000
Other Cost and Expense, Operating	5,000	4,000	8,000	8,000
Depreciation	0	0	0	0
Benefits, Losses and Expenses	33,000	11,000	61,000	21,000
Realized Investment Gains (Losses)	0	0	0	0
Managing General Agency Underwriter
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	13,000	10,000	31,000	25,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,000	1,000	5,000	4,000
Net Investment Income	0	0	0
Amortization of Intangible Assets	1,000	1,000	2,000	2,000
Total assets	155,000	137,000	155,000	137,000
Insurance Commissions and Fees	13,000	10,000	31,000	25,000
Other Cost and Expense, Operating	3,000	2,000	6,000	5,000
Insurance Commissions	8,000	6,000	18,000	14,000
Depreciation	0	0	0	0
Benefits, Losses and Expenses	12,000	9,000	26,000	20,000
Corporate and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	6,000	2,000	8,000	4,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(11,000)	(4,000)	(16,000)	(3,000)
Net Investment Income	2,000	2,000	4,000	4,000
Total assets	216,000	225,000	216,000	225,000
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Other Cost and Expense, Operating	17,000	6,000	24,000	7,000
Depreciation	0	0	1,000	0
Benefits, Losses and Expenses	17,000	6,000	24,000	8,000
Realized Investment Gains (Losses)	5,000	0	5,000	0
Other income Items	0	0	0	0
Property and Casualty, Commercial Insurance
Segment Reporting, Revenue Reconciling Item [Line Items]
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	3,000	2,000	6,000	4,000
Other income Items	0	0	0	0
Deferred Policy Acquisition Costs, Amortization Expense	5,000	1,000	10,000	3,000
Insurance Distribution
Segment Reporting, Revenue Reconciling Item [Line Items]
Other income Items	$ 0	$ 0	$ 0	$ 0