LOANS AND LEASES - Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 59,456		$ 70,700
Current balance	82,273		86,809
Contractual Principal Balance	110,009		104,732
Related Allowance	1,420		1,160
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
Interest income recognized	571	204
Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	19,263		30,925
Current balance	33,424		37,633
Contractual Principal Balance	49,497		43,500
Related Allowance	738		667
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
Interest income recognized	322	26
Lease financing
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	301		22
Current balance	301		22
Contractual Principal Balance	301		22
Related Allowance	0		0
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
Interest income recognized	0	0
Construction real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	7		9
Current balance	8		9
Contractual Principal Balance	25		26
Related Allowance	0		0
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
Interest income recognized	0	1
Commercial real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	21,082		20,500
Current balance	25,206		25,022
Contractual Principal Balance	33,109		32,884
Related Allowance	651		461
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
Interest income recognized	122	102
Residential real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	13,052		13,495
Current balance	16,935		17,598
Contractual Principal Balance	19,535		20,276
Related Allowance	31		32
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
Interest income recognized	88	54
Home equity
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	5,581		5,580
Current balance	6,225		6,351
Contractual Principal Balance	7,232		7,461
Related Allowance	0		0
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
Interest income recognized	38	21
Installment
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	170		169
Current balance	174		174
Contractual Principal Balance	310		563
Related Allowance	0		0
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
Interest income recognized	1	0
Loans with no related allowance recorded [member]
Financing Receivable, Impaired [Line Items]
Current balance	76,195		84,060
Contractual Principal Balance	102,850		101,983
Related Allowance	0		0
Average current balance	80,129	40,334
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	30,142		36,694
Contractual Principal Balance	46,215		42,561
Related Allowance	0		0
Average current balance	33,418	7,867
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Impaired [Line Items]
Current balance	301		22
Contractual Principal Balance	301		22
Related Allowance	0		0
Average current balance	162	41
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Impaired [Line Items]
Current balance	8		9
Contractual Principal Balance	25		26
Related Allowance	0		0
Average current balance	9	28
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Current balance	22,708		23,513
Contractual Principal Balance	29,530		31,375
Related Allowance	0		0
Average current balance	23,111	21,400
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Impaired [Line Items]
Current balance	16,637		17,297
Contractual Principal Balance	19,237		19,975
Related Allowance	0		0
Average current balance	16,967	6,503
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	6,225		6,351
Contractual Principal Balance	7,232		7,461
Related Allowance	0		0
Average current balance	6,288	4,214
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Impaired [Line Items]
Current balance	174		174
Contractual Principal Balance	310		563
Related Allowance	0		0
Average current balance	174	281
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Current balance	6,078
Contractual Principal Balance	7,159
Related Allowance	1,420
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	3,282		939
Contractual Principal Balance	3,282		939
Related Allowance	738		667
Average current balance	2,111	204
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
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] | Construction real estate
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] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Current balance	2,498		1,509
Contractual Principal Balance	3,579		1,509
Related Allowance	651		461
Average current balance	2,004	1,739
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Impaired [Line Items]
Current balance	298		301
Contractual Principal Balance	298		301
Related Allowance	31		32
Average current balance	300	1,051
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	0		0
Contractual Principal Balance	0		0
Related Allowance	0		0
Average current balance	0	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]
Financing Receivable, Impaired [Line Items]
Current balance			2,749
Contractual Principal Balance			2,749
Related Allowance			$ 1,160
Average current balance	$ 4,415	$ 3,095