COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Balance, beginning of period	$ 261,656	$ 255,568	$ 262,381	$ 249,325
Other comprehensive income (loss)	(655)	(5,276)	(2,924)	1,805
Balance, end of period	263,221	248,117	263,221	248,117
Unrealized (Losses) Gains on Securities
Balance, beginning of period	(41,071)	(43,271)	(38,878)	(50,370)
Other comprehensive income (loss)	(639)	(5,265)	(2,832)	1,834
Balance, end of period	(41,710)	(48,536)	(41,710)	(48,536)
Unfunded Retirement Obligations
Balance, beginning of period	365	474	441	492
Other comprehensive income (loss)	(16)	(11)	(92)	(29)
Balance, end of period	349	463	349	463
Accumulated Other Comprehensive (Loss) Income
Balance, beginning of period	(40,706)	(42,797)	(38,437)	(49,878)
Other comprehensive income (loss)	(655)	(5,276)	(2,924)	1,805
Balance, end of period	$ (41,361)	$ (48,073)	$ (41,361)	$ (48,073)