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Unaudited Quarterly Financial Data (Condensed) (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
Summarized unaudited quarterly financial data |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 96,898 | $ 96,464 | $ 94,032 | $ 87,628 | $ 87,759 | $ 85,944 | $ 86,069 | $ 84,381 | $ 375,022 | $ 344,153 | $ 319,681
Interest expense | 7,072 | 7,652 | 7,774 | 7,366 | 7,214 | 7,318 | 7,424 | 7,675 | 29,864 | 29,631 | 29,275
Net interest income | 89,826 | 88,812 | 86,258 | 80,262 | 80,545 | 78,626 | 78,645 | 76,706 | 345,158 | 314,522 | 290,406
Provision for loan losses | 2,886 | 3,327 | 3,013 | 1,598 | 1,139 | 626 | 0 | 568 | 10,824 | 2,333 | 2,284
Net interest income after provision for loan losses | 86,940 | 85,485 | 83,245 | 78,664 | 79,406 | 78,000 | 78,645 | 76,138 | 334,334 | 312,189 | 288,122
Non-interest income | 27,709 | 31,185 | 27,656 | 25,689 | 28,014 | 28,293 | 26,759 | 24,252 | 112,239 | 107,318 | 98,761
Non-interest expense | 68,366 | 68,552 | 65,309 | 63,344 | 66,717 | 65,180 | 64,461 | 62,356 | 265,571 | 258,714 | 236,757
Income before income taxes | 46,283 | 48,118 | 45,592 | 41,009 | 40,703 | 41,113 | 40,943 | 38,034 | 181,002 | 160,793 | 150,126
Federal and state income tax expense | 31,327 | 11,639 | 11,905 | 9,754 | 9,662 | 10,156 | 10,492 | 9,352 | 64,625 | 39,662 | 33,999
Net Income | $ 14,956 | $ 36,479 | $ 33,687 | $ 31,255 | $ 31,041 | $ 30,957 | $ 30,451 | $ 28,682 | $ 116,377 | $ 121,131 | $ 116,127
Basic earnings per share | $ 0.19 | $ 0.47 | $ 0.43 | $ 0.41 | $ 0.41 | $ 0.40 | $ 0.40 | $ 0.38 | $ 1.50 | $ 1.59 | $ 1.54
Diluted earnings per share | $ 0.19 | $ 0.47 | $ 0.43 | $ 0.41 | $ 0.41 | $ 0.40 | $ 0.40 | $ 0.38 | $ 1.50 | $ 1.59 | $ 1.54

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