BORROWINGS - Junior Subordinated Debt Trusts (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 110,106	$ 48,600
Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	115,500
Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	3,885
F.N.B. Statutory Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 22,165
Interest Rate	2.90%
F.N.B. Statutory Trust II [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	1.65%
F.N.B. Statutory Trust II [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 21,500
F.N.B. Statutory Trust II [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	665
Omega Financial Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 26,454
Interest Rate	3.35%
Omega Financial Capital Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	2.19%
Omega Financial Capital Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 26,000
Omega Financial Capital Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	1,114
Yadkin Valley Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 20,739
Interest Rate	2.57%
Yadkin Valley Statutory Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	1.32%
Yadkin Valley Statutory Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 25,000
Yadkin Valley Statutory Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	774
FNB Financial Services Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 21,692
Interest Rate	2.61%
FNB Financial Services Capital Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	1.46%
FNB Financial Services Capital Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 25,000
FNB Financial Services Capital Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	774
American Community Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 10,452
Interest Rate	3.95%
American Community Capital Trust II [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	2.80%
American Community Capital Trust II [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 10,000
American Community Capital Trust II [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	310
Crescent Financial Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 8,604
Interest Rate	4.26%
Crescent Financial Capital Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	3.10%
Crescent Financial Capital Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 8,000
Crescent Financial Capital Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 248