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Pending Acquisition (Details) - Asheville Savings Bank [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
May 01, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Apr. 28, 2017
$ / shares
Restructuring Cost and Reserve [Line Items]      
Cash and Stock transaction value $ 175,000    
Closing stock price | $ / shares     $ 43.12
Banking location   13  
Assets   $ 801,000  
Gross loan   614,000  
Deposits   $ 677,000  
First Bancorp Plans [Member]      
Restructuring Cost and Reserve [Line Items]      
Shareholders received shares per share | shares 1.44    
Shareholders received cash per share | $ / shares $ 41.90    
Percentage of total outstanding shares 90.00%    
Maximum Number of shares exchange 10.00%    
Maximum Number of shares exchange not be exceed 19.90%