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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