LOANS AND LEASES - Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Current balance	$ 52,134		$ 56,873
Contractual Principal Balance	61,350		66,066
Related Allowance	1,401		1,573
Average current balance	54,506		60,310
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	212		875
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	96		282
Interest income recognized	308	$ 303	1,157
Commercial
Financing Receivable, Impaired [Line Items]
Current balance	14,485		17,411
Contractual Principal Balance	15,605		18,576
Related Allowance	400		357
Average current balance	15,948		11,877
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	74		258
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	9		26
Interest income recognized	83		284
Real estate - construction
Financing Receivable, Impaired [Line Items]
Current balance	0		0
Contractual Principal Balance	0		0
Related Allowance	0		0
Average current balance	0		150
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Interest income recognized	0		0
Real estate - commercial
Financing Receivable, Impaired [Line Items]
Current balance	22,977		24,652
Contractual Principal Balance	27,681		29,185
Related Allowance	763		979
Average current balance	23,815		32,291
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	70		344
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	77		213
Interest income recognized	147		557
Real estate - residential
Financing Receivable, Impaired [Line Items]
Current balance	8,663		8,994
Contractual Principal Balance	9,934		10,367
Related Allowance	236		235
Average current balance	8,829		9,839
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	46		184
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	9		40
Interest income recognized	55		224
Home equity
Financing Receivable, Impaired [Line Items]
Current balance	5,669		5,441
Contractual Principal Balance	7,773		7,540
Related Allowance	2		2
Average current balance	5,556		5,749
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	21		82
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1		3
Interest income recognized	22		85
Installment
Financing Receivable, Impaired [Line Items]
Current balance	219		253
Contractual Principal Balance	236		276
Related Allowance	0		0
Average current balance	236		380
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1		7
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Interest income recognized	1		7
Other
Financing Receivable, Impaired [Line Items]
Current balance	121		122
Contractual Principal Balance	121		122
Related Allowance	0		0
Average current balance	122		24
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Interest income recognized	0		0
Loans with no related allowance recorded [member]
Financing Receivable, Impaired [Line Items]
Current balance	40,550		45,881
Contractual Principal Balance	49,562		54,521
Related Allowance	0		0
Average current balance	43,217		44,176
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	13,512		16,418
Contractual Principal Balance	14,442		17,398
Related Allowance	0		0
Average current balance	14,965		10,468
Loans with no related allowance recorded [member] | Real estate - construction
Financing Receivable, Impaired [Line Items]
Current balance	0		0
Contractual Principal Balance	0		0
Related Allowance	0		0
Average current balance	0		150
Loans with no related allowance recorded [member] | Real estate - commercial
Financing Receivable, Impaired [Line Items]
Current balance	14,003		16,301
Contractual Principal Balance	18,707		20,479
Related Allowance	0		0
Average current balance	15,152		19,363
Loans with no related allowance recorded [member] | Real estate - residential
Financing Receivable, Impaired [Line Items]
Current balance	7,126		7,447
Contractual Principal Balance	8,383		8,807
Related Allowance	0		0
Average current balance	7,287		8,143
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	5,569		5,340
Contractual Principal Balance	7,673		7,439
Related Allowance	0		0
Average current balance	5,455		5,648
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Impaired [Line Items]
Current balance	219		253
Contractual Principal Balance	236		276
Related Allowance	0		0
Average current balance	236		380
Loans with no related allowance recorded [member] | Other
Financing Receivable, Impaired [Line Items]
Current balance	121		122
Contractual Principal Balance	121		122
Related Allowance	0		0
Average current balance	122		24
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Current balance	11,584		10,992
Contractual Principal Balance	11,788		11,545
Related Allowance	1,401		1,573
Average current balance	11,289		16,134
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	973		993
Contractual Principal Balance	1,163		1,178
Related Allowance	400		357
Average current balance	983		1,409
Impaired Financing Receivables With Related Allowance [Member] | Real estate - construction
Financing Receivable, Impaired [Line Items]
Current balance	0		0
Contractual Principal Balance	0		0
Related Allowance	0		0
Average current balance	0		0
Impaired Financing Receivables With Related Allowance [Member] | Real estate - commercial
Financing Receivable, Impaired [Line Items]
Current balance	8,974		8,351
Contractual Principal Balance	8,974		8,706
Related Allowance	763		979
Average current balance	8,663		12,928
Impaired Financing Receivables With Related Allowance [Member] | Real estate - residential
Financing Receivable, Impaired [Line Items]
Current balance	1,537		1,547
Contractual Principal Balance	1,551		1,560
Related Allowance	236		235
Average current balance	1,542		1,696
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	100		101
Contractual Principal Balance	100		101
Related Allowance	2		2
Average current balance	101		101
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Impaired [Line Items]
Current balance	0		0
Contractual Principal Balance	0		0
Related Allowance	0		0
Average current balance	0		0
Impaired Financing Receivables With Related Allowance [Member] | Other
Financing Receivable, Impaired [Line Items]
Current balance	0		0
Contractual Principal Balance	0		0
Related Allowance	0		0
Average current balance	$ 0		$ 0