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Income Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income Per Common Share | The following table sets forth the computation of basic and diluted net income per common share: (Dollars in Thousands, Except Per Share Amounts)
|  | Nine Months Ended September 30, |  |  | Three Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 17,619 |  |  | $ | 47,044 |  |  | $ | 10,260 |  |  | $ | 6,708 |
Dividends on Series B Preferred |  |  | (240 | ) |  |  | (240 | ) |  |  | — |  |  |  | — |
Dividends on Series D Preferred |  |  | (60 | ) |  |  | (60 | ) |  |  | — |  |  |  | — |
Total dividends on preferred stocks |  |  | (300 | ) |  |  | (300 | ) |  |  | — |  |  |  | — |
Numerator for basic net income per common share—net income applicable to common stock |  |  | 17,319 |  |  |  | 46,744 |  |  |  | 10,260 |  |  |  | 6,708 |
Dividends on preferred stocks assumed to be converted, if dilutive |  |  | 300 |  |  |  | 300 |  |  |  | — |  |  |  | — |
Numerator for diluted net income per common share |  | $ | 17,619 |  |  | $ | 47,044 |  |  | $ | 10,260 |  |  | $ | 6,708 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic net income per common share—weighted-average shares |  |  | 22,446,557 |  |  |  | 22,346,112 |  |  |  | 22,477,974 |  |  |  | 22,373,731 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stocks |  |  | 916,666 |  |  |  | 917,119 |  |  |  | 916,666 |  |  |  | 916,666 |
Stock options |  |  | 223,352 |  |  |  | 264,965 |  |  |  | 202,645 |  |  |  | 261,341 |
Dilutive potential common shares |  |  | 1,140,018 |  |  |  | 1,182,084 |  |  |  | 1,119,311 |  |  |  | 1,178,007 |
Denominator for diluted net income per common share—adjusted weighted-average shares and assumed conversions |  |  | 23,586,575 |  |  |  | 23,528,196 |  |  |  | 23,597,285 |  |  |  | 23,551,738 |
Basic net income per common share |  | $ | 0.77 |  |  | $ | 2.09 |  |  | $ | 0.46 |  |  | $ | 0.30 |
Diluted net income per common share |  | $ | 0.75 |  |  | $ | 2.00 |  |  | $ | 0.43 |  |  | $ | 0.28 |
Antidilutive Securities Excluded from Computation of Earning Per Share | The following weighted-average shares of securities were not included in the computation of diluted net income per common share as their effect would have been antidilutive:
|  | Nine Months Ended September 30, |  |  | Three Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Stock options |  |  | 249,000 |  |  |  | 254,000 |  |  |  | 243,000 |  |  |  | 254,000 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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