Short-Term Borrowings and Long-Term Debt (Junior Subordinated Debentures) (Details) (Junior Subordinated Debentures [Member], USD $) In Thousands, unless otherwise specified					12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Issuer - FNB Trust I [Member]	Dec. 31, 2011 Issuer - FNB Trust I [Member]	Dec. 31, 2012 Issuer - FNB Trust I [Member] 3 month LIBOR [Member]	Dec. 31, 2012 Issuer - FNB Trust II [Member]	Dec. 31, 2011 Issuer - FNB Trust II [Member]	Dec. 31, 2012 Issuer - FNB Trust II [Member] 3 month LIBOR [Member]	Dec. 31, 2012 Issuer - Catawba Trust II [Member]	Dec. 31, 2011 Issuer - Catawba Trust II [Member]	Dec. 31, 2012 Issuer - Catawba Trust II [Member] 3 month LIBOR [Member]
Debt Instrument [Line Items]
Principal	$ 56,702	$ 56,702	$ 20,619	$ 20,619		$ 30,928	$ 30,928		$ 5,155	$ 5,155
Variable rate basis					3 month LIBOR			3 month LIBOR			3 month LIBOR
Basis spread on variable rate					1.37%			1.32%			3.35%
Interest rate at period end					1.676%			1.626%			3.656%