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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 52,339 $ 50,136 $ 48,509 $ 47,310 $ 47,276 $ 45,993 $ 45,080 $ 44,213 $ 198,294 $ 182,562 $ 167,139
Total interest expense 7,660 6,811 5,837 4,988 4,452 3,998 3,451 2,958 25,296 14,859 9,189
Net interest income 44,679 43,325 42,672 42,322 42,824 41,995 41,629 41,255 172,998 167,703 157,950
Provision (credit) for loan and lease losses (1,386) (59) 532 (211) (186) (126) (2,282) (80) (1,124) (2,674) (5,517)
Net interest income after provision for loan and lease losses 46,065 43,384 42,140 42,533 43,010 42,121 43,911 41,335 174,122 170,377 163,467
Net losses on sales of investment securities (279) 0 0 0 230 0 (1,640) 0 (279) (1,410) 0
Income before income taxes 21,823 20,179 18,159 18,083 17,656 18,353 19,669 20,122 78,244 75,800 73,265
Net income $ 15,792 $ 15,193 $ 14,224 $ 14,277 $ 4,288 $ 11,812 $ 12,025 $ 13,079 $ 59,486 $ 41,204 $ 46,992
Basic earnings per share (in dollars per share) $ 0.54 $ 0.52 $ 0.48 $ 0.48 $ 0.14 $ 0.39 $ 0.39 $ 0.43 $ 2.02 $ 1.36 $ 1.52
Diluted earnings per share (in dollars per share) $ 0.54 $ 0.52 $ 0.48 $ 0.48 $ 0.14 $ 0.39 $ 0.39 $ 0.42 $ 2.01 $ 1.34 $ 1.50