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Merger accounting - Schedule of Acquired Assets and Assumed Liabilities Measured at Estimated Fair Values (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |  |  |
Total Purchase Price | $ 106,536 |  |  |
Net Assets Acquired: |  |  |  |
Cash and due from banks | 6,982 | $ 28,218 | $ 24,656 |
Federal funds sold | 15,410 |  |  |
Investment securities available-for-sale | 156,435 |  |  | $ 156,435
Restricted equity securities | 997 |  |  | 997
Loans, net | 504,002 | 306 | 1,261 | 504,002
Accrued interest receivable | 3,625 |  |  | 3,625
Premises and equipment | 11,737 | (101) | (101) | 11,737
Core deposit and other intangible assets | 6,323 |  |  |
Other assets | 18,647 |  |  | 18,647
Deposits | (628,304) | (684) | (1,056) | (628,304)
Short-term borrowings | (17,737) |  |  | (17,737)
Long-term debt | (2,516) | (53) | (55) | (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 | $ 63,370 |

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