Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
Jan. 31, 2015 |
Jul. 31, 2011 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||||||||
| Core deposit intangible | $ 0 | $ 1,839 | $ 0 | $ 1,839 | ||||
| Goodwill | ||||||||
| December 31, 2015 | [1] | 43,872 | ||||||
| Additions | 0 | |||||||
| Amortization | 0 | |||||||
| Impairment | 0 | |||||||
| September 30, 2016 | 43,872 | 44,333 | 43,872 | 44,333 | ||||
| Intangibles | ||||||||
| December 31, 2015 | 2,683 | |||||||
| Additions | 0 | |||||||
| Amortization | (213) | $ (300) | (789) | $ (901) | ||||
| Impairment | 0 | |||||||
| September 30, 2016 | $ 1,894 | $ 1,894 | ||||||
| MidCarolina [Member] | ||||||||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||||||||
| Core deposit intangible | $ 6,556 | |||||||
| Amortization period of intangible | 108 months | |||||||
| MainStreet BankShares, Inc. [Member] | ||||||||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||||||||
| Core deposit intangible | $ 1,839 | |||||||
| Amortization period of intangible | 120 months | |||||||
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