INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Annual limitation on deferred tax asset	$ 7,300
Deferred tax assets, state operating loss carryforwards	11,800
Valuation allowance	12,828	$ 12,379
Tax credits	4,521	6,860	$ 4,085
Investment in low-income housing	5,600	6,100	6,900
Unrecognized tax benefits	702	657
Unrecognized tax benefits, accrued interest and penalties	79	69
Solar Energy Tax Credit
Operating Loss Carryforwards [Line Items]
Tax credits	2,300	4,000	2,900
Historic Rehabilitation Credit
Operating Loss Carryforwards [Line Items]
Tax credits	1,100	1,800	0
Low-income Housing
Operating Loss Carryforwards [Line Items]
Tax credits	780	1,100	$ 1,200
Tax credits, expected utilization, 2021	538
Tax credits, expected utilization, 2022	538
Tax credits, expected utilization, 2023	538
Tax credits, expected utilization, 2024	322
Tax credits, expected utilization, 2025	86
Tax credits, expected utilization, 2026	34
Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Valuation allowance	2,300
Decrease in valuation allowance	617	1,900
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	159,100	163,700
State and Local Jurisdiction | Operating Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Valuation allowance	10,500	10,100
FSI
Operating Loss Carryforwards [Line Items]
Deferred tax assets, federal operating loss carryforwards	5,400	6,700
FSI | Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 25,800	$ 31,900