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Goodwill and Intangible Assets (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Goodwill and Intangible Assets (Textual) [Abstract] | ||||
| Amortization expense | $ 4,835,000 | $ 3,182,000 | ||
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Minimum [Member]
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| Goodwill and Intangible Assets (Textual) [Abstract] | ||||
| Period of amortization | 4 years | |||
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Maximum [Member]
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| Goodwill and Intangible Assets (Textual) [Abstract] | ||||
| Period of amortization | 14 years | |||
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Harrisonburg branch acquisition [Member]
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| Goodwill and Intangible Assets (Textual) [Abstract] | ||||
| Core deposit intangible | 9,500 | 9,500 | ||
| Goodwill | 1,800,000 | 1,800,000 | ||
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Amortizable core deposit intangibles [Member]
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| Goodwill and Intangible Assets (Textual) [Abstract] | ||||
| Amortization expense | 1,200,000 | 1,600,000 | 2,500,000 | 3,200,000 |
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Amortizable core deposit intangibles [Member] | Harrisonburg branch acquisition [Member]
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| Goodwill and Intangible Assets (Textual) [Abstract] | ||||
| Amortization expense | 9,500 | |||
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Trademark intangible [Member]
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| Goodwill and Intangible Assets (Textual) [Abstract] | ||||
| Amortization expense | $ 100,000 | $ 100,000 | $ 200,000 | $ 200,000 |