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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 606,572	$ 543,267	$ 598,100	$ 521,704
Net current period other comprehensive income	2,252		12,743	15,691
Balance	620,892	565,363	620,892	565,363
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	22,550	2,487	12,059	(6,191)
Other comprehensive income before reclassification	2,254	7,040	12,698	15,702
Amounts reclassified from accumulated other comprehensive income	(2)	(27)	45	(11)
Net current period other comprehensive income	2,252	7,013	12,743	15,691
Balance	24,802	9,500	24,802	9,500
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	24,051	3,843	13,607	(4,796)
Other comprehensive income before reclassification	2,254	7,040	12,698	15,702
Amounts reclassified from accumulated other comprehensive income	(49)	(65)	(49)	(88)
Net current period other comprehensive income	2,205	6,975	12,649	15,614
Balance	26,256	10,818	26,256	10,818
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(1,501)	(1,356)	(1,548)	(1,395)
Other comprehensive income before reclassification	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	47	38	94	77
Net current period other comprehensive income	47	38	94	77
Balance	$ (1,454)	$ (1,318)	$ (1,454)	$ (1,318)

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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