INCOME TAXES (Reconciliation of statutory federal income tax rate) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
INCOME TAXES
Pretax income at statutory, amount									$ 18,810	$ 12,163
Pretax income at statutory rates									21.00%	21.00%
State and local taxes, net of federal income tax benefit, amount									$ 9,904,000	$ 5,828,000
State and local taxes, net of federal income tax benefit, rate									11.06%	10.06%
Nondeductible expenses, amount									$ 680,000	$ 457,000
Nondeductible expenses, rate									0.76%	0.79%
Excess tax deduction on equity awards, amount									$ (467,000)	$ (59,000)
Excess tax deduction on equity awards, rate									(0.52%)	(0.10%)
Tax-exempt income, net amount									$ (51,000)
Tax-exempt income, net rate									(0.06%)
Other, amount									$ 139,000	$ 63,000
Other, rate									0.15%	0.11%
Effective income tax expense, amount	$ 9,165,000	$ 7,994,000	$ 6,229,000	$ 5,627,000	$ 5,482,000	$ 5,111,000	$ 4,953,000	$ 2,906,000	$ 29,015,000	$ 18,452,000
Effective income tax expense, rate									32.39%	31.86%