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SUPPLEMENTARY 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
Supplemental Income Statement Elements [Abstract]                      
Fee revenue and other income $ 26,627 $ 26,435 $ 25,640 $ 25,374 $ 24,734 $ 24,207 $ 23,800 $ 22,771 $ 104,076 $ 95,512 $ 86,136
Interest income 12,910 12,215 11,513 11,288 10,981 10,665 10,332 9,999 47,926 41,977 39,930
Interest expense 1,234 1,029 794 679 666 571 470 480 3,736 2,187 2,029
Net interest income 11,676 11,186 10,719 10,609 10,315 10,094 9,862 9,519 44,190 39,790 37,901
Provision for loan losses (1,500)
Operating expense 29,744 28,530 27,463 26,182 26,142 25,042 24,901 24,318 111,919 100,403 93,473
Income tax expense 1,502 1,481 1,387 1,709 3,576 [1] 2,396 2,248 1,665 6,079 [2] 9,885 [1],[2] 7,716 [2]
Net income $ 7,057 $ 7,610 $ 7,509 $ 8,092 $ 5,331 $ 6,863 $ 6,513 $ 6,307 $ 30,268 $ 25,014 $ 24,348
Net income per share:                      
Basic earnings per share $ 0.48 $ .52 $ 0.51 $ .55 $ .36 $ .47 $ .44 $ .43 $ 2.06 $ 1.70 $ 1.65
Diluted earnings per share $ 0.47 $ 0.51 $ 0.50 $ 0.54 $ 0.36 $ 0.46 $ 0.44 $ 0.42 $ 2.03 $ 1.68 $ 1.63
[1] Includes one-time, non-cash TCJA charge of $1,824,000
[2] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.