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SUPPLEMENTARY 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
Supplemental Income Statement Elements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue and other income | $ 24,734 |  | $ 24,207 | $ 23,800 | $ 22,771 | $ 22,025 | $ 22,149 | $ 21,457 | $ 20,505 | $ 95,512 |  | $ 86,136 | $ 83,368
Interest income | 10,981 |  | 10,665 | 10,332 | 9,999 | 10,158 | 9,985 | 10,010 | 9,777 | 41,977 |  | 39,930 | 38,710
Interest expense | 666 |  | 571 | 470 | 480 | 507 | 505 | 504 | 513 | 2,187 |  | 2,029 | 2,111
Net interest income | 10,315 |  | 10,094 | 9,862 | 9,519 | 9,651 | 9,480 | 9,506 | 9,264 | 39,790 |  | 37,901 | 36,599
Provision for loan losses |  |  |  |  |  | (500) |  |  | (1,000) |  |  | (1,500) | (850)
Operating expense | 26,142 |  | 25,042 | 24,901 | 24,318 | 23,946 | 23,552 | 23,059 | 22,916 | 100,403 |  | 93,473 | 89,783
Income tax expense | 3,576 | [1] | 2,396 | 2,248 | 1,665 | 1,806 | 1,855 | 2,035 | 2,020 | 9,885 | [1] | 7,716 | 7,978
Net income | $ 5,331 |  | $ 6,863 | $ 6,513 | $ 6,307 | $ 6,424 | $ 6,222 | $ 5,869 | $ 5,833 | $ 25,014 |  | $ 24,348 | $ 23,056
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share | $ 0.44 |  | $ 0.56 | $ 0.53 | $ 0.51 | $ .53 | $ .51 | $ .48 | $ .47 | $ 2.04 |  | $ 1.99 | $ 1.85
Diluted earnings per share | $ 0.43 |  | $ 0.55 | $ 0.52 | $ 0.51 | $ .52 | $ .50 | $ .47 | $ .47 | $ 2.01 |  | $ 1.96 | $ 1.82
[1] | Includes one-time, non-cash TCJA charge of $1,824,000

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