LOANS AND LEASES - Nonaccrual, Restructured and Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Document Period End Date			Sep. 30, 2019
Average current balance	$ 83,960	$ 62,493	$ 84,250	$ 52,960
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	39	124	67
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	513	317	1,428	828
Nonaccrual loans	60,693		60,693		$ 70,700
Accruing trouble debt restructurings	18,450		18,450		16,109
Total impaired loans	79,143		79,143		86,809
Restructured loans - nonaccrual status	21,500		21,500		22,400
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,568	1,192	4,648	3,126
Interest included in income
Nonaccrual loans	336	169	863	395
Troubled debt restructurings	184	187	689	500
Total interest included in income	520	356	1,552	895
Net impact on interest income	1,048	836	3,096	2,231
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	42,151	11,611	38,839	9,841
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	28	87	34
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	316	63	807	162
Nonaccrual loans	28,358		28,358		30,925
Total impaired loans	36,917		36,917		37,633
Interest included in income
Total interest included in income	317	91	894	196
Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	290	0	226	21
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	0	0
Nonaccrual loans	284		284		22
Total impaired loans	284		284		22
Interest included in income
Total interest included in income	0	0	0	0
Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	6	17	7	22
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	0	2
Nonaccrual loans	5		5		9
Total impaired loans	5		5		9
Interest included in income
Total interest included in income	0	0	0	2
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	19,713	29,701	22,414	26,420
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	4	3	27	9
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	94	136	295	375
Nonaccrual loans	14,889		14,889		20,500
Total impaired loans	19,756		19,756		25,022
Interest included in income
Total interest included in income	98	139	322	384
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	16,056	14,283	16,661	10,918
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	7	10	21
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	74	86	229	209
Nonaccrual loans	11,655		11,655		13,495
Total impaired loans	16,133		16,133		17,598
Interest included in income
Total interest included in income	76	93	239	230
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	5,594	6,563	5,941	5,439
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	1	0	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	29	31	95	78
Nonaccrual loans	5,427		5,427		5,580
Total impaired loans	5,944		5,944		6,351
Interest included in income
Total interest included in income	29	32	95	81
Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	150	318	162	299
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	2	2
Nonaccrual loans	75		75		169
Total impaired loans	104		104		174
Interest included in income
Total interest included in income	0	1	2	2
Loans with no related allowance recorded [member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	77,824	58,767	78,975	49,550
Total impaired loans	77,249		77,249		84,060
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	37,835	10,033	35,626	8,950
Total impaired loans	36,705		36,705		36,694
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	148	0	155	21
Total impaired loans	0		0		22
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	6	17	7	22
Total impaired loans	5		5		9
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	18,703	28,689	20,907	25,044
Total impaired loans	18,653		18,653		23,513
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	15,388	13,247	16,177	9,875
Total impaired loans	15,838		15,838		17,297
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	5,594	6,463	5,941	5,339
Total impaired loans	5,944		5,944		6,351
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	150	318	162	299
Total impaired loans	104		104		174
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total impaired loans	1,894		1,894
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	4,316	1,578	3,213	891
Total impaired loans	212		212		939
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	142	0	71	0
Total impaired loans	284		284		0
Impaired Financing Receivables With Related Allowance [Member] | Construction real estate
Financing Receivable, Troubled Debt Restructuring [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, Troubled Debt Restructuring [Line Items]
Average current balance	1,010	1,012	1,507	1,376
Total impaired loans	1,103		1,103		1,509
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	668	1,036	484	1,043
Total impaired loans	295		295		301
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	0	100	0	100
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	0	0	0	0
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	$ 6,136	$ 3,726	$ 5,275	$ 3,410
Total impaired loans					$ 2,749