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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
SHARE-BASED COMPENSATION
Net income	$ 14,554	$ 13,534	$ 16,037	$ 15,193	$ 14,224	$ 14,277	$ 44,125	$ 43,694
Weighted average shares outstanding - basic	28,424,898			29,297,465			28,575,369	29,536,536
Weighted average shares outstanding - diluted	28,602,338			29,479,812			28,762,057	29,743,238
Basic earnings per common share (in dollars per share)	$ 0.51			$ 0.52			$ 1.54	$ 1.48
Diluted earnings per common share (in dollars per share)	$ 0.51			$ 0.52			$ 1.53	$ 1.47
Antidilutive securities excluded from the dilutive share calculation (in shares)	0			0			0	0
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	177,440			182,347			186,688	206,702

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