LOANS AND LEASES - Nonaccrual, Restructured and Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Average current balance	$ 62,493	$ 53,260	$ 52,960	$ 54,402
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	39	15	67	67
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	317	293	828	941
Nonaccrual loans	42,368		42,368		$ 24,082
Accruing trouble debt restructurings	20,313		20,313		17,545
Total impaired loans	62,681		62,681		41,627
Restructured loans - nonaccrual status	4,700		4,700		6,400
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,192	761	3,126	2,735
Interest included in income
Nonaccrual loans	169	140	395	445
Troubled debt restructurings	187	168	500	563
Total interest included in income	356	308	895	1,008
Net impact on interest income	836	453	2,231	1,727
Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	11,611	15,562	9,841	16,132
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	28	2	34	26
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	63	63	162	259
Nonaccrual loans	4,310		4,310		5,229
Total impaired loans	11,985		11,985		7,331
Interest included in income
Total interest included in income	91	65	196	285
Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	0	91	21	120
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	3
Nonaccrual loans	0		0		82
Total impaired loans	0		0		82
Interest included in income
Total interest included in income	0	1	0	3
Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	17	950	22	744
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	0	2	0
Nonaccrual loans	10		10		29
Total impaired loans	10		10		29
Interest included in income
Total interest included in income	0	0	2	0
Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	29,701	23,839	26,420	24,076
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3	5	9	18
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	136	147	375	451
Nonaccrual loans	20,338		20,338		10,616
Total impaired loans	28,390		28,390		21,542
Interest included in income
Total interest included in income	139	152	384	469
Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	14,283	8,636	10,918	8,927
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	7	21	20
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	86	55	209	147
Nonaccrual loans	11,365		11,365		4,140
Total impaired loans	15,310		15,310		7,932
Interest included in income
Total interest included in income	93	62	230	167
Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	6,563	3,892	5,439	4,052
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	1	3	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	31	26	78	77
Nonaccrual loans	6,018		6,018		3,743
Total impaired loans	6,654		6,654		4,456
Interest included in income
Total interest included in income	32	27	81	80
Installment
Financing Receivable, Modifications [Line Items]
Average current balance	318	290	299	351
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	2	4
Nonaccrual loans	327		327		243
Total impaired loans	332		332		255
Interest included in income
Total interest included in income	1	1	2	4
Loans with no related allowance recorded [member]
Financing Receivable, Modifications [Line Items]
Average current balance	58,767	49,608	49,550	49,199
Total impaired loans	57,104		57,104		37,183
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	10,033	13,730	8,950	14,669
Total impaired loans	9,209		9,209		7,162
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	0	91	21	120
Total impaired loans	0		0		82
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	17	950	22	744
Total impaired loans	10		10		29
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	28,689	23,187	25,044	21,563
Total impaired loans	26,722		26,722		18,423
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	13,247	7,569	9,875	7,801
Total impaired loans	14,277		14,277		6,876
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	6,463	3,791	5,339	3,951
Total impaired loans	6,554		6,554		4,356
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Modifications [Line Items]
Average current balance	318	290	299	351
Total impaired loans	332		332		255
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Modifications [Line Items]
Total impaired loans	5,577		5,577
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	1,578	1,832	891	1,463
Total impaired loans	2,776		2,776		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	1,012	652	1,376	2,513
Total impaired loans	1,668		1,668		3,119
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	1,036	1,067	1,043	1,126
Total impaired loans	1,033		1,033		1,056
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	100	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	$ 3,726	$ 3,652	$ 3,410	$ 5,203
Total impaired loans					$ 4,444