Fair Value of Financial Instruments - Schedule of Significant Inputs used in the Valuation of Level 3 Assets (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	$ 4,208	$ 4,267
Mortgage servicing rights	43,458	41,426
Equity securities	63,456	85,776
Loans, at fair value	75,975	64,843
Significant unobservable inputs Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total	61,937	63,123
Total liabilities	5,608	8,195
Significant unobservable inputs Level 3 | Fortegra Additional Warrants (Warburg)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Warrants	2,680	5,291
Significant unobservable inputs Level 3 | Contingent consideration payable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Contingent consideration payable	2,928	2,904
Significant unobservable inputs Level 3 | Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	3,014	3,652
Mortgage servicing rights	43,458	41,426
Loans, at fair value	9,197	11,208
Total	61,958	63,590
Warrants	2,680	5,291
Contingent consideration payable	2,928	2,904
Significant unobservable inputs Level 3 | Interest rate lock commitments
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	3,002	3,652
Significant unobservable inputs Level 3 | Mortgage servicing rights | Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgage servicing rights	43,458	41,426
Significant unobservable inputs Level 3 | Dividends from equity securities | Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity securities	6,280	6,885
Significant unobservable inputs Level 3 | Dividends from equity securities | Recurring | Equity securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity securities	6,280	6,837
Significant unobservable inputs Level 3 | Corporate loans | Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans, at fair value	9,197	11,208
Significant unobservable inputs Level 3 | Corporate loans | Recurring | Corporate loans
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans, at fair value	$ 9,197	$ 11,208
Pull through rate | Significant unobservable inputs Level 3 | Interest rate lock commitments | Internal model | Minimum
Unobservable input(s)
Pull through rate	0.45	0.55
Pull through rate | Significant unobservable inputs Level 3 | Interest rate lock commitments | Internal model | Maximum
Unobservable input(s)
Pull through rate	0.95	0.95
Pull through rate | Significant unobservable inputs Level 3 | Interest rate lock commitments | Internal model | Average
Unobservable input(s)
Pull through rate	0.59	0.65
Discount rate | Significant unobservable inputs Level 3 | External model | Minimum | Fortegra Additional Warrants (Warburg)
Unobservable input(s)
Warrants, measurement input	0.03	0.03
Discount rate | Significant unobservable inputs Level 3 | External model | Maximum | Fortegra Additional Warrants (Warburg)
Unobservable input(s)
Warrants, measurement input	0.05	0.05
Discount rate | Significant unobservable inputs Level 3 | External model | Average | Fortegra Additional Warrants (Warburg)
Unobservable input(s)
Warrants, measurement input	0.046	0.033
Discount rate | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Minimum
Unobservable input(s)
Servicing asset, measurement input	0.10	0.09
Discount rate | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Maximum
Unobservable input(s)
Servicing asset, measurement input	0.13	0.14
Discount rate | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Average
Unobservable input(s)
Servicing asset, measurement input	0.10	0.09
Cost to service | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Minimum
Unobservable input(s)
Servicing asset, measurement input	65	65
Cost to service | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Maximum
Unobservable input(s)
Servicing asset, measurement input	80	80
Cost to service | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Average
Unobservable input(s)
Servicing asset, measurement input	73	72
Prepayment speed | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Minimum
Unobservable input(s)
Servicing asset, measurement input	0.03	0.04
Prepayment speed | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Maximum
Unobservable input(s)
Servicing asset, measurement input	1	0.85
Prepayment speed | Significant unobservable inputs Level 3 | Mortgage servicing rights | External model | Average
Unobservable input(s)
Servicing asset, measurement input	0.09	0.09
Forecast EBITDAR | Significant unobservable inputs Level 3 | Dividends from equity securities | Internal model | Minimum | Equity securities
Unobservable input(s)
Equity securities, measurement input	1,039,000,000	728,000,000
Forecast EBITDAR | Significant unobservable inputs Level 3 | Dividends from equity securities | Internal model | Maximum | Equity securities
Unobservable input(s)
Equity securities, measurement input	1,422,000,000	1,039,000,000
Bid marks/EBITDA | Significant unobservable inputs Level 3 | Corporate loans | External model | Corporate loans
Unobservable input(s)
Loan receivable, measurement input		170,000,000
Bid marks/EBITDA | Significant unobservable inputs Level 3 | Corporate loans | External model | Minimum | Corporate loans
Unobservable input(s)
Loan receivable, measurement input	74,000
Bid marks/EBITDA | Significant unobservable inputs Level 3 | Corporate loans | External model | Maximum | Corporate loans
Unobservable input(s)
Loan receivable, measurement input	75,000
Bid marks/EBITDA | Significant unobservable inputs Level 3 | Corporate loans | External model | Average | Corporate loans
Unobservable input(s)
Loan receivable, measurement input	74,500
Implied Equity Volatility | Significant unobservable inputs Level 3 | External model | Minimum | Fortegra Additional Warrants (Warburg)
Unobservable input(s)
Warrants, measurement input	0.40	0.40
Implied Equity Volatility | Significant unobservable inputs Level 3 | External model | Maximum | Fortegra Additional Warrants (Warburg)
Unobservable input(s)
Warrants, measurement input	0.50	0.50
Implied Equity Volatility | Significant unobservable inputs Level 3 | External model | Average | Fortegra Additional Warrants (Warburg)
Unobservable input(s)
Warrants, measurement input	0.45	0.45
Forecast Cash EBITDA | Significant unobservable inputs Level 3 | Cash Flow model | Minimum | Contingent consideration payable
Unobservable input(s)
Contingent consideration, payable, measurement input	2,500	2,500
Forecast Cash EBITDA | Significant unobservable inputs Level 3 | Cash Flow model | Maximum | Contingent consideration payable
Unobservable input(s)
Contingent consideration, payable, measurement input	4,000	4,000
Forecast Underwriting EBITDA | Significant unobservable inputs Level 3 | Cash Flow model | Minimum | Contingent consideration payable
Unobservable input(s)
Contingent consideration, payable, measurement input	0	0
Forecast Underwriting EBITDA | Significant unobservable inputs Level 3 | Cash Flow model | Maximum | Contingent consideration payable
Unobservable input(s)
Contingent consideration, payable, measurement input	2,000	2,000