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Business Combinations - Summary of Pro Forma Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |
Net interest income | $ 67,907 | $ 66,353 | $ 200,363 | $ 196,861
Net income | $ 21,420 | $ 22,960 | $ 65,928 | $ 60,084
Pro forma earnings per share: |  |  |  |
Basic (dollars per share) | $ 0.27 | $ 0.29 | $ 0.83 | $ 0.76
Diluted (dollars per share) | $ 0.27 | $ 0.29 | $ 0.83 | $ 0.75

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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