SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contracts with Customers and Asset Management Fees (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Contracts with Customers
Revenue from contracts with customer	$ 319,964,000	$ 265,378,000	$ 258,209,000
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Revenues	Revenues	Revenues
Cash and Cash Equivalents
Cash equivalents	$ 0	$ 0
Receivables, net
Asset management fees
Asset management fee receivable	$ 27,400,000	30,300,000
Minimum
Asset management fees
Compliance period for properties held in the LIHTC fund	10 years
Maximum
Asset management fees
Compliance period for properties held in the LIHTC fund	15 years
Certain loan origination fees
Contracts with Customers
Revenue from contracts with customer	$ 125,922,000	$ 99,828,000	$ 71,445,000
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Revenues	Revenues	Revenues
Property sales broker fees
Contracts with Customers
Revenue from contracts with customer	$ 83,519,000	$ 60,583,000	$ 53,966,000
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Revenues	Revenues	Revenues
Investment management fees
Contracts with Customers
Revenue from contracts with customer	$ 34,629,000	$ 36,976,000	$ 45,381,000
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Revenues	Revenues	Revenues
Asset Management Fees
Contracts with Customers
Revenue from contracts with customer	$ 26,200,000	$ 21,600,000	$ 36,700,000
Investment banking revenues, appraisal revenues, subscription revenues, syndication fees, and other revenues
Contracts with Customers
Revenue from contracts with customer	$ 75,894,000	$ 67,991,000	$ 87,417,000
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Revenues	Revenues	Revenues