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Merger - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 06, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Net assets acquired: |  |  |
Goodwill |  | $ 27,095 | $ 21,720
TCNB Financial Corp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total purchase price | $ 17,226 |  |
Net assets acquired: |  |  |
Cash and short-term investments | 18,152 |  |
Loans, net | 76,444 |  |
Other securities | 716 |  |
Premises and equipment | 1,738 |  |
Accrued interest receivable | 194 |  |
Core deposit intangible | 1,009 |  |
Other assets | 472 |  |
Noninterest-bearing deposits | (18,263) |  |
Interest-bearing deposits | (68,606) |  |
Other liabilities | (5) |  |
Net assets acquired | 11,851 |  |
Goodwill | $ 5,375 |  |

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