ACCUMULATED OTHER COMPREHENSIVE INCOME - Schedule of components of other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Unrealized gain (loss) on securities available-for-sale:
Unrealized (loss) gain arising during the period, Before Tax	$ 4,039	$ (15,788)
Unrealized (loss) gain arising during the period, Tax Effect	0	49
Unrealized gain (loss) arising during the period	4,039	(15,739)
Unrealized (loss) gain on cash flow hedge:
Unrealized (loss) gain during the period, Before Tax	(1,440)	5,237
Unrealized (loss) gain during the period, Tax Effect	0	0
Unrealized (loss) gain during the period, After Tax	(1,440)	5,237
Reclassification adjustment for (gain) loss included in net (loss) income, Before Tax	(1,004)	322
Reclassification adjustment for (gain) loss included in net (loss) income, Tax Effect	0	0
Reclassification adjustment for (gain) loss included in net (loss) income, After Tax	(1,004)	322
Total (loss) gain, Before Tax	(2,444)	5,559
Total (loss) gain, Tax Effect	0	0
Total (loss) gain, After Tax	(2,444)	5,559
Post-Retirement plans:
Reclassification adjustment for amortization of net actuarial (gain) loss, Before Tax	(2)	48
Reclassification adjustment for amortization of: Net actuarial (gain) loss, Tax Effect	0	0
Reclassification adjustment for amortization of: Net actuarial (gain) loss, After Tax	(2)	48
Total other comprehensive lose, Before Tax	1,593	(10,181)
Total other comprehensive lose, Tax Effect	0	49
Total other comprehensive income (loss)	$ 1,593	$ (10,132)