| **Quarterly Results of Operations (Unaudited) (Tables)**  | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Quarterly Financial Information Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Quarterly Results of Operations (Unaudited)               | The following table sets forth certain quarterly results for the years ended December 31, 2014 and 2013: 20142013FirstSecondThirdFourthFirstSecondThirdFourthInterest income$51,009$51,527$53,290$53,053$43,738$40,653$40,736$45,707Interest expense5,1175,4085,4245,8934,2804,0033,7144,572Net interest income45,89246,11947,86647,16039,45836,65037,02241,135Provision for loan losses1,6009602,1021,9971,5331,016Net interest income after provision for loan losses45,89246,11946,26646,20037,35634,65335,48940,119Non-interest income15,18615,93318,29416,25413,87714,05911,80015,073Non-interest expense43,08941,25042,57641,67734,70033,74234,21940,558Income before income tax expense17,98920,80221,98420,77716,53314,97013,07014,634Income tax expense4,3695,6425,8625,5174,6684,1552,6673,187Net income13,62015,16016,12215,26011,86510,81510,40311,447Preferred stock dividends(857)(852)(430)(241)Net income available to common stockholders$13,620$15,160$16,122$15,260$11,008$9,963$9,973$11,206Basic EPS$0.38$0.42$0.45$0.41 $0.38$0.35$0.35$0.34Diluted EPS$0.38$0.41$0.45$0.41 $0.38$0.34$0.35$0.34Average Shares Outstanding:Basic35,956,43636,026,76336,054,86737,018,01428,716,98728,783,40728,806,80932,597,145Diluted36,260,62436,294,14936,328,98137,323,27628,971,23829,023,51329,081,47232,912,605 |

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| - Definition
Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306
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