ACQUISITIONS - Details of Loans Acquired (Details) - F&M Bancshares. Inc. - USD ($)
$ in Thousands
Dec. 31, 2015
Jan. 01, 2015
Business Acquisition [Line Items]    
Acquired loans receivable $ 404,637  
Discount   $ (6,017)
Commercial and industrial    
Business Acquisition [Line Items]    
Discount   (1,635)
Commercial real estate | Including multi-family residential    
Business Acquisition [Line Items]    
Discount   (3,109)
Commercial real estate | Construction loans    
Business Acquisition [Line Items]    
Discount   (693)
Residential portfolio | Construction loans    
Business Acquisition [Line Items]    
Discount   (72)
Residential portfolio | 1-4 Family residential including home equity    
Business Acquisition [Line Items]    
Discount   (409)
Consumer and other    
Business Acquisition [Line Items]    
Discount   (99)
Contractual Balance    
Business Acquisition [Line Items]    
Acquired loans receivable   410,654
Contractual Balance | Commercial and industrial    
Business Acquisition [Line Items]    
Acquired loans receivable   96,891
Contractual Balance | Commercial real estate | Including multi-family residential    
Business Acquisition [Line Items]    
Acquired loans receivable   225,191
Contractual Balance | Commercial real estate | Construction loans    
Business Acquisition [Line Items]    
Acquired loans receivable   40,787
Contractual Balance | Residential portfolio | Construction loans    
Business Acquisition [Line Items]    
Acquired loans receivable   6,467
Contractual Balance | Residential portfolio | 1-4 Family residential including home equity    
Business Acquisition [Line Items]    
Acquired loans receivable   35,897
Contractual Balance | Consumer and other    
Business Acquisition [Line Items]    
Acquired loans receivable   5,421
Fair Value    
Business Acquisition [Line Items]    
Acquired loans receivable   404,637
Fair Value | Commercial and industrial    
Business Acquisition [Line Items]    
Acquired loans receivable   95,256
Fair Value | Commercial real estate | Including multi-family residential    
Business Acquisition [Line Items]    
Acquired loans receivable   222,082
Fair Value | Commercial real estate | Construction loans    
Business Acquisition [Line Items]    
Acquired loans receivable   40,094
Fair Value | Residential portfolio | Construction loans    
Business Acquisition [Line Items]    
Acquired loans receivable   6,395
Fair Value | Residential portfolio | 1-4 Family residential including home equity    
Business Acquisition [Line Items]    
Acquired loans receivable   35,488
Fair Value | Consumer and other    
Business Acquisition [Line Items]    
Acquired loans receivable   $ 5,322