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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in Accumulated Other Comprehensive Income or Loss by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances	$ 199,699	$ 182,627
Other comprehensive income before reclassification	(10,153)	5,696
Amounts reclassified from accumulated other comprehensive income	0	21
Total other comprehensive income (loss)	(10,153)	5,717
Ending balances	194,784	190,447
Total
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances	2,401	(5,799)
Total other comprehensive income (loss)	(10,153)	5,717
Ending balances	(7,752)	(82)
Unrealized Gains and Losses on Securities Available for Sale
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances	9,127	1,368
Other comprehensive income before reclassification	(10,153)	5,696
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss)	(10,153)	5,696
Ending balances	(1,026)	7,064
Defined Benefit and Other Benefit Plans
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances	(6,726)	(7,167)
Other comprehensive income before reclassification	0	0
Amounts reclassified from accumulated other comprehensive income	0	21
Total other comprehensive income (loss)	0	21
Ending balances	$ (6,726)	$ (7,146)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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