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Short-Term Borrowings and Long-Term Debt (Junior Subordinated Debentures) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
issue
Dec. 31, 2014
USD ($)
Apr. 28, 2006
issue
Debt Instrument [Line Items]      
Number of Junior Subordinated Debentures issued from funds invested from the sale of trust preferred securities | issue 2    
Number of Junior Subordinated Debentures acquired from merger | issue     2
Junior Subordinated Debentures [Member]      
Debt Instrument [Line Items]      
Principal $ 56,702 $ 56,702  
Interest Payable 18 3,303  
Junior Subordinated Debentures [Member] | Issuer - FNB Trust I [Member]      
Debt Instrument [Line Items]      
Principal 20,619 20,619  
Interest Payable $ 18 1,107  
Junior Subordinated Debentures [Member] | Issuer - FNB Trust I [Member] | 3 month LIBOR [Member]      
Debt Instrument [Line Items]      
Variable rate basis 3 month LIBOR    
Basis spread on variable rate 1.37%    
Interest rate at period end 1.88%    
Junior Subordinated Debentures [Member] | Issuer - FNB Trust II [Member]      
Debt Instrument [Line Items]      
Principal $ 30,928 30,928  
Interest Payable $ 0 1,588  
Junior Subordinated Debentures [Member] | Issuer - FNB Trust II [Member] | 3 month LIBOR [Member]      
Debt Instrument [Line Items]      
Variable rate basis 3 month LIBOR    
Basis spread on variable rate 1.32%    
Interest rate at period end 1.65%    
Junior Subordinated Debentures [Member] | Issuer - Catawba Trust II [Member]      
Debt Instrument [Line Items]      
Principal $ 5,155 5,155  
Interest Payable $ 0 $ 608  
Junior Subordinated Debentures [Member] | Issuer - Catawba Trust II [Member] | 3 month LIBOR [Member]      
Debt Instrument [Line Items]      
Variable rate basis 3 month LIBOR    
Basis spread on variable rate 3.35%    
Interest rate at period end 3.68%