LOANS AND LEASES - Nonaccrual, Restructured and Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Average current balance	$ 53,765	$ 59,910	$ 49,716	$ 55,543
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	17	26	28	52
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	318	306	511	648
Nonaccrual loans	40,462		40,462		$ 24,082
Accruing trouble debt restructurings	21,839		21,839		17,545
Total impaired loans	62,301		62,301		41,627
Restructured loans - nonaccrual status	5,900		5,900		6,400
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,132	1,158	1,934	1,974
Interest included in income
Nonaccrual loans	146	163	226	305
Troubled debt restructurings	189	169	313	395
Total interest included in income	335	332	539	700
Net impact on interest income	797	826	1,395	1,274
Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	10,023	19,499	9,125	16,701
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	6	11	6	24
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	73	87	99	196
Nonaccrual loans	3,448		3,448		5,229
Total impaired loans	11,235		11,235		7,331
Interest included in income
Total interest included in income	79	98	105	220
Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	0	98	27	149
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	1	0	2
Nonaccrual loans	0		0		82
Total impaired loans	0		0		82
Interest included in income
Total interest included in income	0	1	0	2
Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	25	1,075	26	538
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	0	2	0
Nonaccrual loans	24		24		29
Total impaired loans	24		24		29
Interest included in income
Total interest included in income	1	0	2	0
Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	27,874	26,123	25,763	24,313
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3	8	6	13
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	140	144	239	304
Nonaccrual loans	21,593		21,593		10,616
Total impaired loans	31,011		31,011		21,542
Interest included in income
Total interest included in income	143	152	245	317
Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	10,215	8,731	9,454	9,217
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	6	14	13
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	76	46	123	92
Nonaccrual loans	9,278		9,278		4,140
Total impaired loans	13,255		13,255		7,932
Interest included in income
Total interest included in income	83	52	137	105
Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	5,323	4,027	5,033	4,212
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	1	2	2
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	27	27	47	51
Nonaccrual loans	5,820		5,820		3,743
Total impaired loans	6,472		6,472		4,456
Interest included in income
Total interest included in income	28	28	49	53
Installment
Financing Receivable, Modifications [Line Items]
Average current balance	305	357	288	413
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	1	1	3
Nonaccrual loans	299		299		243
Total impaired loans	304		304		255
Interest included in income
Total interest included in income	1	1	1	3
Loans with no related allowance recorded [member]
Financing Receivable, Modifications [Line Items]
Average current balance	51,955	55,724	47,029	48,789
Total impaired loans	60,427		60,427		37,183
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	9,714	17,198	8,863	15,607
Total impaired loans	10,856		10,856		7,162
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	0	98	27	149
Total impaired loans	0		0		82
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	25	1,075	26	538
Total impaired loans	24		24		29
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	27,516	25,465	24,485	19,939
Total impaired loans	30,655		30,655		18,423
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	9,173	7,605	8,407	8,032
Total impaired loans	12,216		12,216		6,876
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	5,222	3,926	4,933	4,111
Total impaired loans	6,372		6,372		4,356
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Modifications [Line Items]
Average current balance	305	357	288	413
Total impaired loans	304		304		255
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Modifications [Line Items]
Total impaired loans	1,874		1,874
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	309	2,301	262	1,094
Total impaired loans	379		379		169
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	0	0	0	0
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member] | Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	0	0	0	0
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member] | Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	358	658	1,278	4,374
Total impaired loans	356		356		3,119
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	1,042	1,126	1,047	1,185
Total impaired loans	1,039		1,039		1,056
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	101	101	100	101
Total impaired loans	100		100		100
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Modifications [Line Items]
Average current balance	0	0	0	0
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Modifications [Line Items]
Average current balance	$ 1,810	$ 4,186	$ 2,687	$ 6,754
Total impaired loans					$ 4,444