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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