LOANS AND LEASES - Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 30,118		$ 30,118		$ 17,730
Current balance	49,810		49,810		47,970
Contractual Principal Balance	55,547		55,547		53,930
Related Allowance	385		385		1,324
Average current balance	53,260	$ 50,383	54,402	$ 52,443
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	15	62	67	224
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	293	259	941	710
Interest income recognized	308	321	1,008	934
Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	9,026		9,026		2,419
Current balance	12,325		12,325		13,203
Contractual Principal Balance	12,897		12,897		13,784
Related Allowance	179		179		550
Average current balance	15,562	14,243	16,132	15,096
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	8	26	26
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	63	83	259	232
Interest income recognized	65	91	285	258
Lease financing
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	87		87		195
Current balance	87		87		195
Contractual Principal Balance	87		87		195
Related Allowance	0		0		0
Average current balance	91	691	120	406
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	8
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	1	3	2
Interest income recognized	1	1	3	10
Construction real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	824		824		0
Current balance	824		824		0
Contractual Principal Balance	824		824		0
Related Allowance	0		0		0
Average current balance	950	0	744	0
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
Interest income recognized	0	0	0	0
Commercial real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	12,244		12,244		6,098
Current balance	23,597		23,597		20,460
Contractual Principal Balance	26,115		26,115		22,909
Related Allowance	44		44		593
Average current balance	23,839	21,067	24,076	22,441
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	5	46	18	163
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	147	98	451	259
Interest income recognized	152	144	469	422
Residential real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	4,333		4,333		5,251
Current balance	8,644		8,644		9,601
Contractual Principal Balance	10,003		10,003		10,837
Related Allowance	160		160		179
Average current balance	8,636	9,186	8,927	9,007
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	7	20	24
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	55	52	147	147
Interest income recognized	62	59	167	171
Home equity
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,364		3,364		3,400
Current balance	4,079		4,079		4,074
Contractual Principal Balance	5,195		5,195		5,602
Related Allowance	2		2		2
Average current balance	3,892	4,736	4,052	5,145
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	26	23	77	65
Interest income recognized	27	24	80	68
Installment
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	240		240		367
Current balance	254		254		437
Contractual Principal Balance	426		426		603
Related Allowance	0		0		0
Average current balance	290	460	351	348
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	2	4	5
Interest income recognized	1	2	4	5
Credit card
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	0		0		0
Related Allowance	0		0		0
Loans with no related allowance recorded [member]
Financing Receivable, Impaired [Line Items]
Current balance	47,959		47,959		37,383
Contractual Principal Balance	53,691		53,691		43,292
Related Allowance	0		0		0
Average current balance	49,608	40,515	49,199	41,864
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	12,146		12,146		12,134
Contractual Principal Balance	12,718		12,718		12,713
Related Allowance	0		0		0
Average current balance	13,730	13,015	14,669	13,990
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Impaired [Line Items]
Current balance	87		87		195
Contractual Principal Balance	87		87		195
Related Allowance	0		0		0
Average current balance	91	155	120	138
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Impaired [Line Items]
Current balance	824		824		0
Contractual Principal Balance	824		824		0
Related Allowance	0		0		0
Average current balance	950	0	744	0
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Current balance	23,089		23,089		12,232
Contractual Principal Balance	25,607		25,607		14,632
Related Allowance	0		0		0
Average current balance	23,187	14,363	21,563	14,757
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Impaired [Line Items]
Current balance	7,581		7,581		8,412
Contractual Principal Balance	8,935		8,935		9,648
Related Allowance	0		0		0
Average current balance	7,569	7,887	7,801	7,587
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	3,978		3,978		3,973
Contractual Principal Balance	5,094		5,094		5,501
Related Allowance	0		0		0
Average current balance	3,791	4,635	3,951	5,044
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Impaired [Line Items]
Current balance	254		254		437
Contractual Principal Balance	426		426		603
Related Allowance	0		0		0
Average current balance	290	460	351	348
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Current balance	1,851		1,851
Contractual Principal Balance	1,856		1,856
Related Allowance	385		385
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	179		179		1,069
Contractual Principal Balance	179		179		1,071
Related Allowance	179		179		550
Average current balance	1,832	1,228	1,463	1,106
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
Financing Receivable, Impaired [Line Items]
Current balance	0		0		0
Contractual Principal Balance	0		0		0
Related Allowance	0		0		0
Average current balance	0	536	0	268
Impaired Financing Receivables With Related Allowance [Member] | Construction real estate
Financing Receivable, Impaired [Line Items]
Current balance	0		0		0
Contractual Principal Balance	0		0		0
Related Allowance	0		0		0
Average current balance	0	0	0	0
Impaired Financing Receivables With Related Allowance [Member] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Current balance	508		508		8,228
Contractual Principal Balance	508		508		8,277
Related Allowance	44		44		593
Average current balance	652	6,704	2,513	7,684
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Impaired [Line Items]
Current balance	1,063		1,063		1,189
Contractual Principal Balance	1,068		1,068		1,189
Related Allowance	160		160		179
Average current balance	1,067	1,299	1,126	1,420
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	101		101		101
Contractual Principal Balance	101		101		101
Related Allowance	2		2		2
Average current balance	101	101	101	101
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Impaired [Line Items]
Current balance	0		0		0
Contractual Principal Balance	0		0		0
Related Allowance	0		0		0
Average current balance	0	0	0	0
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Current balance					10,587
Contractual Principal Balance					10,638
Related Allowance					$ 1,324
Average current balance	$ 3,652	$ 9,868	$ 5,203	$ 10,579