LOANS AND LEASES - Nonaccrual, Restructured and Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Average current balance	$ 84,544	$ 43,429
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	64	11
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	507	193
Nonaccrual loans	59,456		$ 70,700
Accruing trouble debt restructurings	22,817		16,109
Total impaired loans	82,273		86,809
Restructured loans - nonaccrual status	13,100		22,400
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,613	802
Interest included in income
Nonaccrual loans	335	80
Troubled debt restructurings	236	124
Total interest included in income	571	204
Net impact on interest income	1,042	598
Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	35,529	8,071
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	43	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	279	26
Nonaccrual loans	19,263		30,925
Total impaired loans	33,424		37,633
Interest included in income
Total interest included in income	322	26
Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	162	41
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0
Nonaccrual loans	301		22
Total impaired loans	301		22
Interest included in income
Total interest included in income	0	0
Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	9	28
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	1
Nonaccrual loans	7		9
Total impaired loans	8		9
Interest included in income
Total interest included in income	0	1
Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	25,115	23,139
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	19	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	103	99
Nonaccrual loans	21,082		20,500
Total impaired loans	25,206		25,022
Interest included in income
Total interest included in income	122	102
Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	17,267	7,554
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	7
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	86	47
Nonaccrual loans	13,052		13,495
Total impaired loans	16,935		17,598
Interest included in income
Total interest included in income	88	54
Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	6,288	4,315
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	1
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	38	20
Nonaccrual loans	5,581		5,580
Total impaired loans	6,225		6,351
Interest included in income
Total interest included in income	38	21
Installment
Financing Receivable, Modifications [Line Items]
Average current balance	174	281
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	0
Nonaccrual loans	170		169
Total impaired loans	174		174
Interest included in income
Total interest included in income	1	0
Loans with no related allowance recorded [member]
Financing Receivable, Modifications [Line Items]
Average current balance	80,129	40,334
Total impaired loans	76,195		84,060
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	33,418	7,867
Total impaired loans	30,142		36,694
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	162	41
Total impaired loans	301		22
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	9	28
Total impaired loans	8		9
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	23,111	21,400
Total impaired loans	22,708		23,513
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	16,967	6,503
Total impaired loans	16,637		17,297
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	6,288	4,214
Total impaired loans	6,225		6,351
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Modifications [Line Items]
Average current balance	174	281
Total impaired loans	174		174
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Modifications [Line Items]
Total impaired loans	6,078
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Average current balance	2,111	204
Total impaired loans	3,282		939
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
Financing Receivable, Modifications [Line Items]
Average current balance	0	0
Total impaired loans	0		0
Impaired Financing Receivables With Related Allowance [Member] | Construction real estate
Financing Receivable, Modifications [Line Items]
Average current balance	0	0
Total impaired loans	0		0
Impaired Financing Receivables With Related Allowance [Member] | Commercial real estate
Financing Receivable, Modifications [Line Items]
Average current balance	2,004	1,739
Total impaired loans	2,498		1,509
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Modifications [Line Items]
Average current balance	300	1,051
Total impaired loans	298		301
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Modifications [Line Items]
Average current balance	0	101
Total impaired loans	0		0
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Modifications [Line Items]
Average current balance	0	0
Total impaired loans	0		0
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Modifications [Line Items]
Average current balance	$ 4,415	$ 3,095
Total impaired loans			$ 2,749