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Borrowings and Borrowings Availability (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Borrowings $ 407,543 $ 271,394
First Bancorp Capital Trust II [Member]    
Borrowings 10,300 10,300
First Bancorp Capital Trust III [Member]    
Borrowings 10,300 10,300
First Bank Corp Capital Trust IV [Member]    
Borrowings 25,800 25,800
Carolina Capital Trust [Member]    
Borrowings 10,300 10,300
FHLB Line of Credit [Member]    
Line of credit, borrowing capacity 936,000  
Line of credit, outstanding 354,000 225,000
Line of credit, amount reduced 198,000 $ 193,000
Line of credit, amount unused 384,000  
FRB Line of Credit [Member]    
Line of credit, borrowing capacity 109,000  
Federal Funds Line of Credit [Member]    
Line of credit, borrowing capacity $ 35,000