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Acquisitions and FDIC Indemnification Asset (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Gain on Sale of certain assets and liabilities of Insurance Brokerage Operation $ 13,021,000 $ 0    
Assets 2,939,240,000   $ 2,979,585,000  
Goodwill 34,355,000   39,489,000  
Loans and Leases Receivable, Net of Loans with Deteriorated Credit Quality, Covered 6,100,000   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
Operating Income (Loss)     $ 168,000 $ 554,000