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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |
Summarized unaudited quarterly financial data |
| Quarters ended 2013
(Dollars in thousands, except per share data) | March 31 |  | June 30 |  | September 30 |  | December 31
Interest income | $ | 57,955 |  |  | 62,151 |  |  | 69,531 |  |  | 73,939 |
Interest expense | 7,458 |  |  | 7,185 |  |  | 7,186 |  |  | 6,929 |
Net interest income | 50,497 |  |  | 54,966 |  |  | 62,345 |  |  | 67,010 |
Provision for loan losses | 2,100 |  |  | 1,078 |  |  | 1,907 |  |  | 1,802 |
Net interest income after provision for loan losses | 48,397 |  |  | 53,888 |  |  | 60,438 |  |  | 65,208 |
Non-interest income | 22,950 |  |  | 23,222 |  |  | 23,873 |  |  | 23,002 |
Non-interest expense | 43,434 |  |  | 48,481 |  |  | 50,368 |  |  | 53,034 |
Income before income taxes | 27,913 |  |  | 28,629 |  |  | 33,943 |  |  | 35,176 |
Federal and state income tax expense | 7,145 |  |  | 5,927 |  |  | 8,315 |  |  | 8,630 |
Net income | 20,768 |  |  | 22,702 |  |  | 25,628 |  |  | 26,546 |
Basic earnings per share | 0.29 |  |  | 0.31 |  |  | 0.35 |  |  | 0.36 |
Diluted earnings per share | 0.29 |  |  | 0.31 |  |  | 0.35 |  |  | 0.36 |
| Quarters ended 2012
(Dollars in thousands, except per share data) | March 31 |  | June 30 |  | September 30 |  | December 31
Interest income | $ | 67,884 |  |  | 64,192 |  |  | 62,015 |  |  | 59,666 |
Interest expense | 9,598 |  |  | 9,044 |  |  | 8,907 |  |  | 8,165 |
Net interest income | 58,286 |  |  | 55,148 |  |  | 53,108 |  |  | 51,501 |
Provision for loan losses | 8,625 |  |  | 7,925 |  |  | 2,700 |  |  | 2,275 |
Net interest income after provision for loan losses | 49,661 |  |  | 47,223 |  |  | 50,408 |  |  | 49,226 |
Non-interest income | 20,338 |  |  | 21,791 |  |  | 23,974 |  |  | 25,393 |
Non-interest expense | 49,045 |  |  | 46,190 |  |  | 50,178 |  |  | 48,008 |
Income before income taxes | 20,954 |  |  | 22,824 |  |  | 24,204 |  |  | 26,611 |
Federal and state income tax expense | 4,621 |  |  | 3,843 |  |  | 4,760 |  |  | 5,853 |
Net income | 16,333 |  |  | 18,981 |  |  | 19,444 |  |  | 20,758 |
Basic earnings per share | 0.23 |  |  | 0.26 |  |  | 0.27 |  |  | 0.29 |
Diluted earnings per share | 0.23 |  |  | 0.26 |  |  | 0.27 |  |  | 0.29 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=25249566&loc=d3e1280-108306 + Details
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