Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) level3FinancialInstruments	Mar. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of Reportable Segments | level3FinancialInstruments	2
Revenues	$ 62,756	$ 49,551
Policyholder Benefits and Claims Incurred, Net	10,496	19,355
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(15,107)	(3,239)
Provision (benefit) for income taxes from continuing operations	(617)	130
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(14,490)	(3,369)
Premiums Earned, Net	15,678	25,579
Net Investment Income	2,815	3,640
Other Operating Income (Expense), Net	(1,124)	36
Amortization of Intangible Assets	8,763	1,139
Interest Expense, Operating and Nonoperating	5,454	0
Total assets	8,253,282	8,428,615		$ 8,058,378
Premiums Written, Net	18,004	26,247
Derivative, Gain (Loss) on Derivative, Net	427	(48)
Insurance Commissions and Fees	36,771	17,729
Other Cost and Expense, Operating		0
Insurance Commissions	10,365	9,822
Depreciation	413	475
Depreciation, Depletion and Amortization	9,176	1,614
Benefits, Losses and Expenses	77,863	52,790
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(1,654)	(701)
Net income attributable to common shareholders	(44,737)	20,771
Realized Investment Gains (Losses)	(3)	1
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	3,652	2,567
Deferred Policy Acquisition Costs, Amortization Expense	3,841	4,424
Corporate costs reallocated to continuing operations	2,763	3,944
Labor and Related Expense	22,887	10,546
Non Compensation Expense	15,644	7,029
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(16,144)	(4,070)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(30,247)	24,140
Net Income (Loss) Available to Common Stockholders, Basic	(46,391)	20,070
Disposal Group, Including Discontinued Operation, Assets	6,392,004	7,454,216	$ 6,267,200
EBITDA	(477)	(1,625)
Other Comprehensive Income (losss) Net of Tax Portion Attributable to Noncontrolling Interest EBITDA Adjusted	(5,000)	(701)
AMBAC EBITDA	(5,477)	(2,545)
Fee Income	4,964	0
Specialty Property & Casualty Program
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	21,171	29,542
Policyholder Benefits and Claims Incurred, Net	10,496	19,355
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,503	1,821
Provision (benefit) for income taxes from continuing operations	78	106
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,425	1,715
Premiums Earned, Net	15,678	25,579
Total assets	802,856	608,006
Depreciation	0	0
Benefits, Losses and Expenses	19,668	27,721
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	0	(2)
Labor and Related Expense	3,510	1,760
Non Compensation Expense	1,821	2,182
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	1,425	1,713
EBITDA	1,503	1,821
AMBAC EBITDA	1,503	1,823
Managing General Agency Underwriter
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	40,998	17,865
Interest Expense, Operating and Nonoperating	5,454
Insurance Commissions and Fees	36,771	17,729
Other Cost and Expense, Operating		0
Insurance Commissions	10,365	9,822
Depreciation, Depletion and Amortization	8,872	1,149
Corporate Segment and Other Operating Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	587	2,145
Net Investment Income	597	2,192
Other Operating Income (Expense), Net	(10)	(47)
Property and Casualty, Commercial Insurance
Segment Reporting, Revenue Reconciling Item [Line Items]
Net Investment Income	1,842	1,399
Other Operating Income (Expense), Net	(1)	(3)
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	3,652	2,567
Deferred Policy Acquisition Costs, Amortization Expense	3,841	4,424
Insurance Distribution
Segment Reporting, Revenue Reconciling Item [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(2,243)	3,973
Provision (benefit) for income taxes from continuing operations	(500)	118
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(1,743)	3,855
Net Investment Income	376	50
Other Operating Income (Expense), Net	(1,113)	86
Amortization of Intangible Assets	8,763	1,139
Interest Expense, Operating and Nonoperating	5,454	0
Total assets	929,172	155,722
Depreciation	109	10
Benefits, Losses and Expenses	43,241	13,892
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	1,654
Labor and Related Expense	13,533	2,296
Non Compensation Expense	5,017	625
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(3,397)	3,152
EBITDA	12,083	5,122
Other Comprehensive Income (losss) Net of Tax Portion Attributable to Noncontrolling Interest EBITDA Adjusted	(5,000)	(703)
AMBAC EBITDA	7,083	4,202
Fee Income	4,964	0
Corporate Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(14,367)	(9,032)
Provision (benefit) for income taxes from continuing operations	(195)	(94)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(14,172)	(8,938)
Total assets	129,250	210,671
Depreciation	305	465
Depreciation, Depletion and Amortization	304	465
Benefits, Losses and Expenses	14,954	11,177
Labor and Related Expense	5,844	6,490
Non Compensation Expense	8,806	4,222
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(14,172)	(8,938)
EBITDA	(14,062)	(8,567)
AMBAC EBITDA	(14,063)	(8,567)
Continuing Operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total assets	$ 1,861,278	$ 974,399