Junior Subordinated Debt - Junior Subordinated Debt Trusts (Detail) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 F.N.B. Statutory Trust II [Member]	Mar. 31, 2014 Omega Financial Capital Trust I [Member]	Mar. 31, 2014 BCSB Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Trust Preferred Securities	$ 67,500		$ 21,500	$ 36,000	$ 10,000
Common Securities	2,089		665	1,114	310
Junior subordinated debt	$ 68,517	$ 75,205	$ 22,165	$ 36,042	$ 10,310
Stated Maturity Date			Jun. 15, 2036	Oct. 18, 2034	Oct. 07, 2033
Interest Rate			1.88%	2.43%	3.24%
Description of variable rate			Variable; LIBOR + 165 basis points (bps)	Variable; LIBOR + 219 bps	Variable; LIBOR + 300 bps
Basis points			1.65%	2.19%	3.00%