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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share Basic and Diluted [Line Items]
Net income	$ 10,331	$ 16,381	$ 15,957	$ 16,001	$ 16,013	$ 14,701	$ 10,044	$ 8,759	$ 58,670	$ 49,518	$ 33,744
Weighted average number of shares issued, basic (shares)									32,604	30,074	26,525
Weighted average number of shares, treasury stock (shares)									1,116	1,215	1,386
Weighted average number of shares, restricted stock (shares)									500	466	409
Weighted average number of shares outstanding, basic (shares)	32,185	30,621	30,605	30,511	30,500	29,893	28,301	24,803	30,988	28,393	24,730
Weighted average number of shares outstanding, diluted (shares)	32,381	30,811	30,765	30,688	30,694	30,069	28,461	24,955	31,167	28,564	24,854
Basic earnings per share (USD per share)	$ 0.32	$ 0.53	$ 0.52	$ 0.52	$ 0.53	$ 0.49	$ 0.35	$ 0.35	$ 1.89	$ 1.74	$ 1.36
Diluted earnings per share (USD per share)	$ 0.32	$ 0.53	$ 0.52	$ 0.52	$ 0.52	$ 0.49	$ 0.35	$ 0.35	$ 1.88	$ 1.73	$ 1.36
Restricted Stock
Earnings Per Share Basic and Diluted [Line Items]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (shares)									122	106	67
Employee Stock Option
Earnings Per Share Basic and Diluted [Line Items]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (shares)									57	65	57

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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