ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ 701,096	$ 596,758	$ 602,081
Total other comprehensive (loss) income, net of tax	(257)	16	560
Balance	1,192,620	701,096	596,758
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(5,924)	(5,940)	(6,500)
Other comprehensive income (loss) before reclassifications	670	(130)
Amounts reclassified from accumulated other comprehensive loss	(927)	146
Total other comprehensive (loss) income, net of tax	(257)	16	560
Balance	(6,181)	(5,924)	(5,940)
Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	12,694	4,621
Other comprehensive income (loss) before reclassifications	(19,733)	11,221
Amounts reclassified from accumulated other comprehensive loss	(825)	(3,148)
Total other comprehensive (loss) income, net of tax	(20,558)	8,073
Balance	(7,864)	12,694	4,621
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(6,086)	(6,024)
Other comprehensive income (loss) before reclassifications	5,520	802
Amounts reclassified from accumulated other comprehensive loss	(740)	(864)
Total other comprehensive (loss) income, net of tax	4,780	(62)
Balance	(1,306)	(6,086)	(6,024)
Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(12,532)	(4,537)
Other comprehensive income (loss) before reclassifications	14,883	(12,153)
Amounts reclassified from accumulated other comprehensive loss	638	4,158
Total other comprehensive (loss) income, net of tax	15,521	(7,995)
Balance	$ 2,989	$ (12,532)	$ (4,537)