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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 42,255 $ 41,765 $ 41,870 $ 41,249 $ 39,916 $ 39,442 $ 38,896 $ 37,781 $ 167,139 $ 156,035 $ 149,809
Total interest expense 2,551 2,339 2,261 2,038 1,722 1,637 1,602 1,546 9,189 6,507 6,391
Net interest income 39,704 39,426 39,609 39,211 38,194 37,805 37,294 36,235 157,950 149,528 143,418
Provision (credit) for loan and lease losses (2,645) (743) (1,382) (747) (1,958) (3,647) (7,319) (2,747) (5,517) (15,671) (6,414)
Net interest income after provision for loan and lease losses 42,349 40,169 40,991 39,958 40,152 41,452 44,613 38,982 163,467 165,199 149,832
Investment securities gains (losses)         0 0 (1,866) 0 0 (1,866) 240
Income before income taxes 18,646 17,858 18,468 17,248 17,417 19,106 20,279 16,154 72,220 72,956 60,842
Net income $ 12,208 $ 11,466 $ 12,137 $ 11,181 $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 46,992 $ 45,868 $ 40,453
Basic earnings per share (in dollars per share) $ 0.40 $ 0.37 $ 0.39 $ 0.36 $ 0.35 $ 0.39 $ 0.39 $ 0.30 $ 1.52 $ 1.42 $ 1.08
Diluted earnings per share (in dollars per share) $ 0.39 $ 0.37 $ 0.39 $ 0.35 $ 0.34 $ 0.38 $ 0.39 $ 0.29 $ 1.50 $ 1.40 $ 1.07