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Unaudited Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summarized unaudited quarterly financial data |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 73,939 | $ 69,531 | $ 62,151 | $ 57,955 | $ 59,666 | $ 62,015 | $ 64,192 | $ 67,884 | $ 263,576 | $ 253,757 | $ 280,109
Interest expense | 6,929 | 7,186 | 7,185 | 7,458 | 8,165 | 8,907 | 9,044 | 9,598 | 28,758 | 35,714 | 44,494
Net Interest Income | 67,010 | 62,345 | 54,966 | 50,497 | 51,501 | 53,108 | 55,148 | 58,286 | 234,818 | 218,043 | 235,615
Provision for loan losses | 1,802 | 1,907 | 1,078 | 2,100 | 2,275 | 2,700 | 7,925 | 8,625 | 6,887 | 21,525 | 64,500
Net interest income after provision for loan losses | 65,208 | 60,438 | 53,888 | 48,397 | 49,226 | 50,408 | 47,223 | 49,661 | 227,931 | 196,518 | 171,115
Noninterest Income | 23,002 | 23,873 | 23,222 | 22,950 | 25,393 | 23,974 | 21,791 | 20,338 | 93,047 | 91,496 | 78,199
Noninterest Expense | 53,034 | 50,368 | 48,481 | 43,434 | 48,008 | 50,178 | 46,190 | 49,045 | 195,317 | 193,421 | 232,124
Income Before Income Taxes | 35,176 | 33,943 | 28,629 | 27,913 | 26,611 | 24,204 | 22,824 | 20,954 | 125,661 | 94,593 | 17,190
Federal and state income tax expense | 8,630 | 8,315 | 5,927 | 7,145 | 5,853 | 4,760 | 3,843 | 4,621 | 30,017 | 19,077 | (281)
Net Income | $ 26,546 | $ 25,628 | $ 22,702 | $ 20,768 | $ 20,758 | $ 19,444 | $ 18,981 | $ 16,333 | $ 95,644 | $ 75,516 | $ 17,471
Basic earnings per share | $ 0.36 | $ 0.35 | $ 0.31 | $ 0.29 | $ 0.29 | $ 0.27 | $ 0.26 | $ 0.23 | $ 1.31 | $ 1.05 | $ 0.24
Diluted earnings per share | $ 0.36 | $ 0.35 | $ 0.31 | $ 0.29 | $ 0.29 | $ 0.27 | $ 0.26 | $ 0.23 | $ 1.31 | $ 1.05 | $ 0.24

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