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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 47,276 $ 45,993 $ 45,080 $ 44,213 $ 42,255 $ 41,765 $ 41,870 $ 41,249 $ 182,562 $ 167,139 $ 156,035
Total interest expense 4,452 3,998 3,451 2,958 2,551 2,339 2,261 2,038 14,859 9,189 6,507
Net interest income 42,824 41,995 41,629 41,255 39,704 39,426 39,609 39,211 167,703 157,950 149,528
Provision (credit) for loan and lease losses (186) (126) (2,282) (80) (2,645) (743) (1,382) (747) (2,674) (5,517) (15,671)
Net interest income after provision for loan and lease losses 43,010 42,121 43,911 41,335 42,349 40,169 40,991 39,958 170,377 163,467 165,199
Net losses on sales of investment securities         0 0 0 0 (1,410) 0 (1,866)
Income before income taxes 17,542 18,179 19,446 19,889 18,646 17,858 18,468 17,248 75,056 72,220 72,956
Net income $ 4,288 $ 11,812 $ 12,025 $ 13,079 $ 12,208 $ 11,466 $ 12,137 $ 11,181 $ 41,204 $ 46,992 $ 45,868
Basic earnings per share (in dollars per share) $ 0.14 $ 0.39 $ 0.39 $ 0.43 $ 0.40 $ 0.37 $ 0.39 $ 0.36 $ 1.36 $ 1.52 $ 1.42
Diluted earnings per share (in dollars per share) $ 0.14 $ 0.39 $ 0.39 $ 0.42 $ 0.39 $ 0.37 $ 0.39 $ 0.35 $ 1.34 $ 1.50 $ 1.40