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Merger accounting - Schedule of Acquired Assets and Assumed Liabilities Measured at Estimated Fair Values (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Business Combinations [Abstract] |  |  |
Total Purchase Price | $ 106,536 |  |
Net Assets Acquired: |  |  |
Cash and due from banks | 6,982 | 30,004 | 15,581
Federal funds sold | 15,410 | 9,460 |
Investment securities available-for-sale | 156,435 | 156,435 |
Restricted equity securities | 997 | 997 |
Loans, net | 504,002 | 504,002 |
Accrued interest receivable | 3,625 | 3,625 |
Premises and equipment | 11,737 | 11,737 |
Core deposit and other intangible assets | 6,323 | 6,323 |
Other assets | 18,647 | 18,647 |
Deposits | (628,304) | (628,304) |
Short-term borrowings | (17,737) | (17,737) |
Long-term debt | (2,516) | 2,516 |
Accrued interest payable | (473) | (473) |
Other liabilities | (5,976) | (5,976) |
Net assets acquired | 69,152 |  |
Treasury stock acquired | 412 |  |
Goodwill resulting from merger | $ 36,972 | $ 63,370 | $ 26,398

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