Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Trust Preferred Capital Notes Qualify for Tier 1 Capital) (Details)

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BORROWINGS (Trust Preferred Capital Notes Qualify for Tier 1 Capital) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Investment $ 251,081 $ 99,854
Trust Preferred Capital Notes    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance 145,500  
Investment 4,504  
Statutory Trust I    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance 22,500  
Investment $ 696  
Rate (2) 5.06%  
Maturity Jun. 17, 2034  
Statutory Trust I | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 2.75%  
Statutory Trust II    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance $ 36,000  
Investment $ 1,114  
Rate (2) 3.71%  
Maturity Jun. 15, 2036  
Statutory Trust II | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 1.40%  
VFG Limited Liability Trust I Indenture    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance $ 20,000  
Investment $ 619  
Rate (2) 5.04%  
Maturity Mar. 18, 2034  
VFG Limited Liability Trust I Indenture | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 2.73%  
FNB Statutory Trust II Indenture    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance $ 12,000  
Investment $ 372  
Rate (2) 5.41%  
Maturity Jun. 26, 2033  
FNB Statutory Trust II Indenture | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 3.10%  
Gateway Capital Statutory Trust I    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance $ 8,000  
Investment $ 248  
Rate (2) 5.41%  
Maturity Sep. 17, 2033  
Gateway Capital Statutory Trust I | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 3.10%  
Gateway Capital Statutory Trust II    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance $ 7,000  
Investment $ 217  
Rate (2) 4.96%  
Maturity Jun. 17, 2034  
Gateway Capital Statutory Trust II | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 2.65%  
Gateway Capital Statutory Trust III    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance $ 15,000  
Investment $ 464  
Rate (2) 3.81%  
Maturity May 30, 2036  
Gateway Capital Statutory Trust III | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 1.50%  
Gateway Capital Statutory Trust IV    
Debt Instrument [Line Items]    
Trust preferred capital notes principal balance $ 25,000  
Investment $ 774  
Rate (2) 3.86%  
Maturity Jul. 30, 2037  
Gateway Capital Statutory Trust IV | LIBOR    
Debt Instrument [Line Items]    
Spread to 3-Month LIBOR 1.55%