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Earnings Per Share | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding during the period presented. Diluted earnings per share is computed by including the net increase in shares as if dilutive outstanding stock options were exercised and restricted stock awards were vested, using the treasury stock method. Basic and diluted earnings per share has been computed based on the following:
| Years ended
(Dollars in thousands, except per share data) | December 31, 2014 |  | December 31, 2013 |  | December 31, 2012
Net income available to common stockholders, basic and diluted | $ | 112,755 |  |  | 95,644 |  |  | 75,516 |
Average outstanding shares - basic | 74,641,957 |  |  | 73,191,713 |  |  | 71,928,570 |
Add: dilutive stock options and awards | 45,358 |  |  | 68,565 |  |  | 86 |
Average outstanding shares - diluted | 74,687,315 |  |  | 73,260,278 |  |  | 71,928,656 |
Basic earnings per share | $ | 1.51 |  |  | 1.31 |  |  | 1.05 |
Diluted earnings per share | $ | 1.51 |  |  | 1.31 |  |  | 1.05 |
There were 0, 38,915 and 879,525 options excluded from the diluted average outstanding share calculation for the years ended December 31, 2014, 2013, and 2012, respectively, due to the option exercise price exceeding the market price of the Company’s common stock.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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