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Loans Purchased credit impaired loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Purchased credit impaired loans    
Carrying Amount $ 35,064 $ 19,067
Loan Type    
Purchased credit impaired loans    
Outstanding Balance 47,281 24,292
Commercial real estate, other    
Purchased credit impaired loans    
Outstanding Balance 16,893 7,762
Commercial and industrial    
Purchased credit impaired loans    
Outstanding Balance 3,040 1,041
Residential real estate    
Purchased credit impaired loans    
Outstanding Balance 27,155 15,183
Consumer    
Purchased credit impaired loans    
Outstanding Balance $ 193 $ 306