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QUARTERLY FINANCIAL DATA (UNAUDITED) (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
QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 30,366 | $ 29,569 | $ 28,726 | $ 27,998 | $ 28,011 | $ 27,695 | $ 27,442 | $ 26,803 | $ 116,659 | $ 109,951 | $ 105,525
Interest expense | 2,201 | 2,318 | 2,201 | 2,165 | 2,244 | 2,178 | 2,055 | 1,928 | 8,885 | 8,405 | 7,654
Net interest income (expense) | 28,165 | 27,251 | 26,525 | 25,833 | 25,767 | 25,517 | 25,387 | 24,875 | 107,774 | 101,546 | 97,871
Provision (recapture) for loan losses | 1,050 | (1,654) | (694) | 960 | 650 | 1,225 | 975 | 1,725 | (338) | 4,575 | 6,950
Net interest income after provision (recapture) for loan losses | 27,115 | 28,905 | 27,219 | 24,873 | 25,117 | 24,292 | 24,412 | 23,150 | 108,112 | 96,971 | 90,921
Noninterest income | 3,144 | 4,086 | 3,526 | 3,448 | 4,400 | 3,551 | 3,572 | 4,226 | 14,204 | 15,749 | 14,967
Noninterest expense | 21,989 | 19,017 | 18,859 | 18,427 | 18,638 | 18,030 | 18,768 | 18,066 | 78,292 | 73,502 | 70,961
Net income before income tax expense | 8,270 | 13,974 | 11,886 | 9,894 | 10,879 | 9,813 | 9,216 | 9,310 | 44,024 | 39,218 | 34,927
Income tax benefit | 6,313 | 3,927 | 3,181 | 3,032 | 3,322 | 3,032 | 2,845 | 2,811 | 16,453 | 12,010 | 10,791
Net income | $ 1,957 | $ 10,047 | $ 8,705 | $ 6,862 | $ 7,557 | $ 6,781 | $ 6,371 | $ 6,499 | $ 27,571 | $ 27,208 | $ 24,136
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.08 | $ 0.46 | $ 0.39 | $ 0.31 | $ 0.34 | $ 0.31 | $ 0.29 | $ 0.29 | $ 1.23 | $ 1.23 | $ 1.07
Diluted | $ 0.08 | $ 0.45 | $ 0.39 | $ 0.31 | $ 0.34 | $ 0.31 | $ 0.29 | $ 0.29 | $ 1.22 | $ 1.22 | $ 1.06

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