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SUPPLEMENTAL DATA (unaudited) (Schedule of Unaudited Quarterly Financial Data) (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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 45,556 | $ 45,948 | $ 44,603 | $ 44,563 | $ 42,781 | $ 40,163 | $ 39,674 | $ 37,068 | $ 180,670 | $ 159,686 | $ 138,727
Interest expense | 14,642 | 15,863 | 15,335 | 14,556 | 13,396 | 12,021 | 10,431 | 8,675 | 60,396 | 44,523 | 27,586
Net interest income before provision for loan and lease losses | 30,914 | 30,085 | 29,268 | 30,007 | 29,385 | 28,142 | 29,243 | 28,393 | 120,274 | 115,163 | 111,141
Provision for loan losses | 1,950 | 800 | 1,150 | 100 | 1,500 | 500 | 300 | 1,250 | 4,000 | 3,550 | 5,850
Wealth management fee income | 10,120 | 9,501 | 9,568 | 9,174 | 8,552 | 8,200 | 8,126 | 8,367 | 38,363 | 33,245 | 23,183
Securities gains/(losses), net | (45) | 34 | 69 | 59 | 46 | (325) | (36) | (78) | 117 | (393) |
Other income | 5,450 | 4,881 | 3,389 | 2,496 | 2,657 | 3,108 | 3,650 | 1,926 |  |  |
Operating expenses | 26,701 | 26,259 | 26,173 | 25,715 | 25,524 | 24,284 | 24,941 | 23,337 |  |  |
Income before income tax expense | 17,788 | 17,442 | 14,971 | 15,921 | 13,616 | 14,341 | 15,742 | 14,021 | 66,122 | 57,720 | 54,307
Income tax expense | 5,555 | 5,216 | 3,421 | 4,496 | 2,887 | 3,617 | 3,832 | 3,214 | 18,688 | 13,550 | 17,810
Net income | $ 12,233 | $ 12,226 | $ 11,550 | $ 11,425 | $ 10,729 | $ 10,724 | $ 11,910 | $ 10,807 | $ 47,434 | $ 44,170 | $ 36,497
EARNINGS PER SHARE |  |  |  |  |  |  |  |  |  |  |
Earnings per share-basic | $ 0.64 | $ 0.63 | $ 0.59 | $ 0.59 | $ 0.56 | $ 0.56 | $ 0.63 | $ 0.58 | $ 2.46 | $ 2.33 | $ 2.07
Earnings per share-diluted | $ 0.64 | $ 0.63 | $ 0.59 | $ 0.58 | $ 0.55 | $ 0.56 | $ 0.62 | $ 0.57 | $ 2.44 | $ 2.31 | $ 2.03

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