SENIOR DEBT - Schedule of Senior Debt (Details) - Senior Notes - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Bank Borrowings
Weighted Average Interest Rate at End of Year	8.19%	6.97%	3.50%
Maximum Amount Outstanding During Year	$ 125,250	$ 81,942	$ 119,304
Average Amount Outstanding During Year	$ 92,381	$ 47,083	$ 68,080
Weighted Average Interest Rate During Year	8.05%	7.07%	4.83%
Senior Demand Notes
Weighted Average Interest Rate at End of Year	1.91%	1.92%	1.91%
Maximum Amount Outstanding During Year	$ 115,527	$ 122,860	$ 103,979
Average Amount Outstanding During Year	$ 102,967	$ 113,151	$ 95,143
Weighted Average Interest Rate During Year	1.90%	1.92%	1.90%
Weighted Average Interest Rate at End of Year
Weighted Average Interest Rate at End of Year	5.93%	3.94%	3.46%
Maximum Amount Outstanding During Year	$ 658,942	$ 633,534	$ 550,929
Average Amount Outstanding During Year	$ 633,086	$ 604,980	$ 491,431
Weighted Average Interest Rate During Year	5.02%	3.54%	3.48%