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Acquisitions and FDIC Indemnification Asset (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Gain on Sale of certain assets and liabilities of Insurance Brokerage Operation $ 0 $ 0 $ 13,021,000    
Assets     2,958,016,000 $ 2,979,585,000  
Goodwill     34,355,000 39,489,000  
Loans and Leases Receivable, Net of Loans with Deteriorated Credit Quality, Covered     6,000,000 6,500,000  
First National Bank Of Danville [Member]          
Business Acquisition [Line Items]          
Reimbursements from the FDIC     19,400,000    
Business Aquisition, Loss Sharing Agreement Losses On Assets Threshold     $ 29,000,000    
Business Acquisition Loss Sharing Agreement Losses In Excess Of Threshold To Be Reimbursed Percentage     95.00%    
Business Acquisition, Loss Sharing Agreement Losses Up To Threshold To Be Reimbursed Percentage     80.00%    
Forrest Sherer Insurance [Domain]          
Business Acquisition [Line Items]          
Assets       13,000,000 $ 15,800,000
Insurance Services Revenue       7,600,000 8,300,000
Goodwill $ 5.1        
Operating Income (Loss)       $ 168,000 $ 554,000