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SHAREHOLDERS’ EQUITY AND COMPENSATION PLANS - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,078,975	$ 867,185
Ending balance	1,092,497	846,436
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	22,320	14,977
Net change	(10,920)	10,561
Ending balance	11,400	25,538
Unamortized Gain (Loss) on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	19,308	4,934
Net change	(1,149)	(156)
Ending balance	18,159	4,778
Net Unrealized Loss on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,508)	(2,162)
Net change	1,126	(5,057)
Ending balance	(3,382)	(7,219)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	37,120	17,749
Net change	(10,943)	5,348
Ending balance	$ 26,177	$ 23,097

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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 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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