INVESTMENTS IN DEBT SECURITIES (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Increase (Decrease) in Fair Value Of Bonds	$ (65,800)
Amortized cost after ten years	0
Fair value after ten years	6,000
Nonaccrual bonds		$ 12,900
Non Accrual Bonds Interest Income Cash Basis Method		400
Interest Income Nonaccrual Bonds Not Recognized		1,000
Proceeds from sale of investments in bonds	29,300	12,800
Investments in debt securities	31,365	97,190
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in debt securities	31,365	97,190
Unpaid principal balance of bond investments	$ 30,885	$ 92,332
Infrastructure Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Pay rate on available-for-sale bonds		6.30%
Number of TDRs | item	0
Contractual term of bond investments		30 years 1 month 6 days
Investments in debt securities	$ 25,339	$ 24,973
Unpaid principal balance of bond investments	26,885	27,170
Multifamily Tax-Exempt Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in debt securities	6,026	72,217
Unpaid principal balance of bond investments	$ 4,000	$ 65,162