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Net Income Per Common Share | 12 Months Ended
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Dec. 31, 2011
Net Income Per Common Share [Abstract] |
Net Income Per Common Share | (16) NET INCOME PER COMMON SHARE Basic and diluted net income per common share are calculated as follows:
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
|  | (Dollars in thousands, except per share data) |
Year Ended December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 45,621 |  |  |  | 15,267,357 |  |  | $ | 2.99 |
Effect of stock options |  |  | — |  |  |  | 282,774 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 45,621 |  |  |  | 15,550,131 |  |  | $ | 2.93 |
Year Ended December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 42,309 |  |  |  | 15,348,102 |  |  | $ | 2.76 |
Effect of stock options |  |  | — |  |  |  | 303,210 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 42,309 |  |  |  | 15,651,312 |  |  | $ | 2.70 |
Year Ended December 31, 2009 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 32,609 |  |  |  | 15,299,781 |  |  | $ | 2.13 |
Effect of stock options |  |  | — |  |  |  | 294,008 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 32,609 |  |  |  | 15,593,789 |  |  | $ | 2.09 |
The following table shows the number and average exercise price of options that were excluded from the computation of diluted net income per common share for each year because the options' exercise prices were greater than the average market price of the common shares.
|  | Shares |  |  | Average Exercise Price |
December 31, 2011 |  |  | 550,495 |  |  | $ | 38.85 |
December 31, 2010 |  |  | 420,679 |  |  | $ | 38.31 |
December 31, 2009 |  |  | 304,292 |  |  | $ | 43.01 |

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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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: 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=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6920599&loc=d3e1278-109256 Reference 5: 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 6: 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=6880815&loc=d3e20235-122688 + Details
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