| **Net Income Per Share (Tables)** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Earnings Per Share [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Net Income Per Share              | The following table reconciles basic and diluted net income per share for the years indicated: 2014 2013 2012   Weighted-Average Shares     Weighted-Average Shares     Weighted-Average Shares  Basic net income per share:$60,162     $44,530     $45,122    Preferred stock dividends     (2,380)     (4,539)    Net income available to common stockholders60,162 36,266,356 $1.66 42,150 29,731,420 $1.42 40,583 28,632,915 $1.42Effect of dilutive stock options and warrants  288,253     276,960     213,769  Diluted net income per share:                 Net income available to common stockholders$60,162 36,554,609 $1.65 $42,150 30,008,380 $1.41 $40,583 28,846,684 $1.41 |

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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
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