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SUPPLEMENTARY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Income Statement Elements [Abstract]                      
Fee revenue and other income $ 27,422 $ 28,262 $ 27,372 $ 27,013 $ 26,627 $ 26,435 $ 25,640 $ 25,374 $ 110,069 $ 104,076 $ 95,512
Interest income 12,719 13,666 13,327 12,897 12,910 12,215 11,513 11,288 52,609 47,926 41,977
Interest expense 1,206 1,392 1,305 1,290 1,234 1,029 794 679 5,193 3,736 2,187
Net interest income 11,513 12,274 12,022 11,607 11,676 11,186 10,719 10,609 47,416 44,190 39,790
Provision for loan losses 250 250
Operating expense 30,773 30,563 29,971 28,462 29,744 28,530 27,463 26,182 119,769 111,919 100,403
Income tax expense 1,791 1,787 1,739 1,745 1,502 1,481 1,387 1,709 7,062 [1] 6,079 [1] 9,885 [1]
Net income $ 6,371 $ 8,186 $ 7,684 $ 8,163 $ 7,057 $ 7,610 $ 7,509 $ 8,092 $ 30,404 $ 30,268 $ 25,014
Net income per share:                      
Basic earnings per share $ 0.44 $ 0.57 $ 0.53 $ 0.56 $ 0.48 $ 0.52 $ 0.51 $ 0.55 $ 2.11 $ 2.06 $ 1.70
Diluted earnings per share $ 0.43 $ 0.56 $ 0.52 $ 0.55 $ 0.47 $ 0.51 $ 0.50 $ 0.54 $ 2.07 $ 2.03 $ 1.68
[1] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2019 and 2018 and 35% for 2017. The tax-equivalent adjustment was approximately $2,084,000 for 2019, $2,422,000 for 2018, and $5,691,000 for 2017.