COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 665,794	$ 357,574
Amounts reclassified to accumulated other comprehensive income for transfer of securities to available for sale	522
Balance at end of year	675,139	363,448
Securities available for sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	1,480	(2,358)
Other comprehensive income before reclassifications	6,018	3,191
Amounts reclassified to accumulated other comprehensive income for transfer of securities to available for sale	522
Amounts reclassified from accumulated other comprehensive income	(2,525)
Net current period other comprehensive income	4,015	3,191
Related tax effect	(1,237)	(703)
Balance at end of year	$ 4,258	$ 130

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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