LOANS AND LEASES - Nonaccrual, Restructured and Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Modifications [Line Items]          
Average current balance $ 50,383 $ 57,849 $ 52,443 $ 61,171  
Nonaccrual loans 18,301   18,301   $ 27,997
Accruing trouble debt restructurings 32,164   32,164   28,876
Total impaired loans 50,465   50,465   56,873
Restructured loans - nonaccrual status 5,600   5,600   9,300
Interest income effect          
Gross amount of interest that would have been recorded under original terms 705 852 2,173 2,750  
Interest included in income          
Nonaccrual loans 97 91 269 370  
Troubled debt restructurings 224 168 665 436  
Total interest included in income 321 259 934 806  
Net impact on interest income 384 593 1,239 1,944  
Commercial          
Financing Receivable, Modifications [Line Items]          
Average current balance 14,243 10,847 15,096 10,494  
Nonaccrual loans 3,201   3,201   8,405
Total impaired loans 14,799   14,799   17,411
Interest included in income          
Total interest included in income 91 53 258 169  
Real estate - construction          
Financing Receivable, Modifications [Line Items]          
Average current balance 0 151 0 187  
Nonaccrual loans 0   0   0
Total impaired loans 0   0   0
Interest included in income          
Total interest included in income 0 0 0 0  
Real estate - commercial          
Financing Receivable, Modifications [Line Items]          
Average current balance 21,067 31,631 22,441 34,201  
Nonaccrual loans 5,985   5,985   9,418
Total impaired loans 21,196   21,196   24,652
Interest included in income          
Total interest included in income 144 131 422 408  
Residential - real estate          
Financing Receivable, Modifications [Line Items]          
Average current balance 9,186 9,119 9,007 10,051  
Nonaccrual loans 4,759   4,759   5,027
Total impaired loans 9,285   9,285   8,994
Interest included in income          
Total interest included in income 59 53 171 163  
Installment          
Financing Receivable, Modifications [Line Items]          
Average current balance 460 5,705 348 412  
Nonaccrual loans 327   327   127
Total impaired loans 384   384   253
Interest included in income          
Total interest included in income 2 2 5 6  
Home equity          
Financing Receivable, Modifications [Line Items]          
Average current balance 4,736 396 5,145 5,826  
Nonaccrual loans 3,815   3,815   4,898
Total impaired loans 4,587   4,587   5,441
Interest included in income          
Total interest included in income 24 20 68 60  
Other          
Financing Receivable, Modifications [Line Items]          
Average current balance 691 0 406 0  
Nonaccrual loans 214   214   122
Total impaired loans 214   214   $ 122
Interest included in income          
Total interest included in income $ 1 $ 0 $ 10 $ 0