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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 39,916 | $ 39,442 | $ 38,896 | $ 37,781 | $ 37,741 | $ 37,139 | $ 37,536 | $ 37,393 | $ 156,035 | $ 149,809 | $ 140,278
Total interest expense | 1,722 | 1,637 | 1,602 | 1,546 | 1,557 | 1,607 | 1,630 | 1,597 | 6,507 | 6,391 | 7,169
Net interest income | 38,194 | 37,805 | 37,294 | 36,235 | 36,184 | 35,532 | 35,906 | 35,796 | 149,528 | 143,418 | 133,109
Provision (credit) for loan and lease losses | (1,958) | (3,647) | (7,319) | (2,747) | (5,371) | (1,722) | 1,995 | (1,316) | (15,671) | (6,414) | (11,310)
Net interest income after provision for loan and lease losses | 40,152 | $ 41,452 | 44,613 | 38,982 | 41,555 | 37,254 | 33,911 | 37,112 | 165,199 | 149,832 | 144,419
Investment securities gains (losses) | 0 |  | (1,866) | 0 | 0 | 0 | 240 | 0 | (1,866) | 240 | 482
Income before income taxes | 17,417 | $ 19,106 | 20,279 | 16,154 | 19,018 | 13,471 | 13,027 | 15,326 | 72,956 | 60,842 | 59,828
Net income | $ 10,932 | $ 12,206 | $ 12,335 | $ 10,395 | $ 13,265 | $ 8,230 | $ 9,150 | $ 9,808 | $ 45,868 | $ 40,453 | $ 172,075
Basic earnings per share (in dollars per share) | $ 0.35 | $ 0.39 | $ 0.39 | $ 0.30 | $ 0.37 | $ 0.23 | $ 0.25 | $ 0.23 | $ 1.42 | $ 1.08 | $ 4.10
Diluted earnings per share (in dollars per share) | $ 0.34 | $ 0.38 | $ 0.39 | $ 0.29 | $ 0.37 | $ 0.23 | $ 0.25 | $ 0.23 | $ 1.40 | $ 1.07 | $ 4.07

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