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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) | 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
Interest income | $ 72,876,000 | $ 71,778,000 | $ 68,133,000 | $ 64,407,000 | $ 63,428,000 | $ 62,308,000 | $ 61,160,000 | $ 59,741,000 | $ 277,194,000 | $ 246,637,000 | $ 235,545,000
Interest expense | 5,044,000 | 4,705,000 | 4,378,000 | 4,207,000 | 4,676,000 | 4,640,000 | 4,627,000 | 4,850,000 | 18,334,000 | 18,793,000 | 20,617,000
Net interest income | 67,832,000 | 67,073,000 | 63,755,000 | 60,200,000 | 58,752,000 | 57,668,000 | 56,533,000 | 54,891,000 | 258,860,000 | 227,844,000 | 214,928,000
Provision (benefit) | 1,300,000 | 0 | 1,050,000 | 600,000 | 4,000,000 | 950,000 | 600,000 | 525,000 | 2,950,000 | 6,075,000 | 1,500,000
Total noninterest income | 21,914,000 | 20,770,000 | 21,398,000 | 18,912,000 | 21,762,000 | 20,416,000 | 21,095,000 | 19,155,000 | 82,994,000 | 82,428,000 | 75,888,000
Total noninterest expenses | 51,467,000 | 51,310,000 | 52,809,000 | 48,773,000 | 51,637,000 | 46,857,000 | 47,146,000 | 46,482,000 | 204,359,000 | 192,122,000 | 197,138,000
Provision for income taxes | 14,915,000 | 12,681,000 | 10,731,000 | 9,014,000 | 7,698,000 | 9,793,000 | 9,508,000 | 8,428,000 | 47,341,000 | 35,427,000 | 27,218,000
Net Income | $ 22,064,000 | $ 23,852,000 | $ 20,563,000 | $ 20,725,000 | $ 17,179,000 | $ 20,484,000 | $ 20,374,000 | $ 18,611,000 | $ 87,204,000 | $ 76,648,000 | $ 64,960,000
Basic earnings per share (in dollars per share) | $ 0.80 | $ 0.87 | $ 0.75 | $ 0.77 | $ 0.64 | $ 0.78 | $ 0.77 | $ 0.71 | $ 3.19 | $ 2.90 | $ 2.51
Weighted average common shares (basic) (in shares) | 27,445,739 | 27,436,792.000 | 27,257,799.000 | 27,029,640 | 26,710,029.000 | 26,324,316.000 | 26,304,129.000 | 26,275,323 | 27,294,028 | 26,404,071 | 25,891,382
Diluted earnings per share (in dollars per share) | $ 0.80 | $ 0.87 | $ 0.75 | $ 0.76 | $ 0.64 | $ 0.78 | $ 0.77 | $ 0.71 | $ 3.19 | $ 2.90 | $ 2.50
Common share equivalents (in shares) | 77,615 | 76,307.000 | 74,497.000 | 81,283 | 60,022.000 | 53,072.000 | 47,885.000 | 43,409 | 78,076 | 51,847 | 68,566
Weighted average common shares (diluted) (in shares) | 27,523,354 | 27,513,099 | 27,332,296 | 27,110,923 | 26,770,051.000 | 26,377,388.000 | 26,352,014.000 | 26,318,732 | 27,372,104 | 26,455,918 | 25,959,948
Gains (Losses) on Extinguishment of Debt | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 437,000 | $ 0 | $ 437,000 | $ 122,000
Acquisition Related Costs | 0 | 0 | 2,909,000 | 484,000 | 4,764,000 | 151,000 | 206,000 | 334,000 | 3,393,000 | 5,455,000 | 10,501,000
Total unusual or infrequent expense items | 0 | 0 | 2,909,000 | 484,000 | 4,764,000 | 151,000 | 206,000 | 771,000 |  |  |
Tax Expense related to a change in tax law | 2,361,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | 466,000 | $ 0 | $ 0
Investments in Low Income Housing Projects [Member] |  |  |  |  |  |  |  |  |  |  |
Tax Expense related to a change in tax law | 466,000 |  |  |  |  |  |  |  | 466,000 |  |
Net Deferred Tax Asset [Member] |  |  |  |  |  |  |  |  |  |  |
Tax Expense related to a change in tax law | $ 1,895,000 |  |  |  |  |  |  |  | $ 1,900,000 |  |

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