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SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of weighted average shares outstanding (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings per Share
Net income available for stockholders	$ 19,444	$ 28,239	$ 28,488
Less: Adjustments for earnings attributable to participating securities	(416)	(669)	(762)
Net income used in calculating earnings per share	$ 19,028	$ 27,570	$ 27,726
Weighted average shares outstanding (including participating securities)	33,926	34,061	34,529
Adjustment for participating securities	(734)	(831)	(959)
Shares used in calculating diluted earnings per share	33,192	33,230	33,570

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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