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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ 2,888	$ 5,882	$ 6,740	$ 4,131	$ 2,868	$ 3,792
Net unrealized gain (loss) on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	5,741		13,069
Income taxes related to items of accumulated other comprehensive income:	(1,343)		(3,046)
Accumulated other comprehensive income	4,398	7,237	10,023	11,681	11,412	5,550
Net unrealized gain (loss) on hedging derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	(121)		(2,432)
Income taxes related to items of accumulated other comprehensive income:	29		567
Accumulated other comprehensive income	(92)	63	(1,865)	(6,393)	(7,387)	(601)
Net unrealized gain (loss) on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	(1,850)		(1,850)
Income taxes related to items of accumulated other comprehensive income:	432		432
Accumulated other comprehensive income	$ (1,418)	$ (1,418)	$ (1,418)	$ (1,157)	$ (1,157)	$ (1,157)

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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