LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - TDR MODIFICATIONS (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) item	Sep. 30, 2015 USD ($) item	Sep. 30, 2016 USD ($) item	Sep. 30, 2015 USD ($) item	Dec. 31, 2015 USD ($) item
Troubled Debt Restructurings disclosures
Number of Loans | item			315		347
Recorded Investment			$ 42,432,000		$ 49,580,000
Commitments to lend any additional material amounts to existing TDR relationships	$ 0		$ 0		$ 0
Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | item			284		307
Recorded Investment			$ 30,738,000		$ 35,209,000
Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item			2		2
Recorded Investment			$ 512,000		$ 631,000
Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item			214		229
Recorded Investment			$ 26,845,000		$ 30,384,000
Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item			15		16
Recorded Investment			$ 944,000		$ 1,560,000
Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | item			53		60
Recorded Investment			$ 2,437,000		$ 2,634,000
Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | item			31		40
Recorded Investment			$ 11,694,000		$ 14,371,000
Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item			4		7
Recorded Investment			$ 1,404,000		$ 1,998,000
Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item			16		13
Recorded Investment			$ 4,739,000		$ 5,748,000
Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item			11		20
Recorded Investment			$ 5,551,000		$ 6,625,000
Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | item	8	6	19	28
Recorded Investment	$ 2,389,000	$ 2,009,000	$ 2,936,000	$ 5,587,000
Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | item	5	5	16	21
Recorded Investment	$ 660,000	$ 388,000	$ 1,207,000	$ 2,146,000
Modified During The Period | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item				1
Recorded Investment				$ 621,000
Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item	1	2	8	11
Recorded Investment	$ 262,000	$ 195,000	$ 645,000	$ 1,049,000
Modified During The Period | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item				2
Recorded Investment				$ 46,000
Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | item	4	3	8	7
Recorded Investment	$ 398,000	$ 193,000	$ 562,000	$ 430,000
Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | item	3	1	3	7
Recorded Investment	$ 1,729,000	$ 1,621,000	$ 1,729,000	$ 3,441,000
Modified During The Period | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item				1
Recorded Investment				$ 170,000
Modified During The Period | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item	2		2	1
Recorded Investment	$ 225,000		$ 225,000	$ 825,000
Modified During The Period | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item	1	1	1	5
Recorded Investment	$ 1,504,000	$ 1,621,000	$ 1,504,000	$ 2,446,000
Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | item			212		252
Recorded Investment			$ 30,299,000		$ 36,644,000
Percentage of troubled debt restructurings performing as per terms of modifications			71.00%		74.00%
Specific reserve allocations made to customers	$ 4,000,000		$ 4,000,000		$ 5,000,000
Percentage of Bank's TDRs that occurred during period, which were performing according to their modified terms	26.00%	16.00%
Percentage of Bank's TDRs that occurred during year to date period, which were performing according to their modified terms			32.00%	55.00%
Specific reserve allocations made to customers whose loan terms were modified in TDRs during period	$ 75,000	$ 9,000	$ 75,000	$ 9,000
Performing Financing Receivable | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | item			190		224
Recorded Investment			$ 21,878,000		$ 27,380,000
Performing Financing Receivable | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item			1		2
Recorded Investment			$ 10,000		$ 631,000
Performing Financing Receivable | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item			159		183
Recorded Investment			$ 20,229,000		$ 24,734,000
Performing Financing Receivable | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item			8		9
Recorded Investment			$ 651,000		$ 789,000
Performing Financing Receivable | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | item			22		30
Recorded Investment			$ 988,000		$ 1,226,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | item			22		28
Recorded Investment			$ 8,421,000		$ 9,264,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item			3		6
Recorded Investment			$ 974,000		$ 1,517,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item			11		10
Recorded Investment			$ 2,606,000		$ 5,021,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item			8		12
Recorded Investment			$ 4,841,000		$ 2,726,000
Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | item	5	4	11	14
Recorded Investment	$ 613,000	$ 325,000	$ 932,000	$ 3,064,000
Specific reserve allocations made to customers	$ 109,000	$ 75,000	$ 109,000	$ 75,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | item	4	4	10	9
Recorded Investment	$ 525,000	$ 325,000	$ 844,000	$ 1,345,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item				1
Recorded Investment				$ 621,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item	1	2	5	6
Recorded Investment	$ 262,000	$ 195,000	$ 494,000	$ 594,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | item	3	2	5	2
Recorded Investment	$ 263,000	$ 130,000	$ 350,000	$ 130,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | item	1		1	5
Recorded Investment	$ 88,000		$ 88,000	$ 1,719,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item				1
Recorded Investment				$ 170,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item	1		1	1
Recorded Investment	$ 88,000		$ 88,000	$ 825,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item				3
Recorded Investment				$ 724,000
Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | item			103		95
Recorded Investment			$ 12,133,000		$ 12,936,000
Nonperforming Financing Receivable | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | item			94		83
Recorded Investment			$ 8,860,000		$ 7,829,000
Nonperforming Financing Receivable | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item			1
Recorded Investment			$ 502,000
Nonperforming Financing Receivable | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item			55		46
Recorded Investment			$ 6,616,000		$ 5,650,000
Nonperforming Financing Receivable | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item			7		7
Recorded Investment			$ 293,000		$ 771,000
Nonperforming Financing Receivable | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | item			31		30
Recorded Investment			$ 1,449,000		$ 1,408,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | item			9		12
Recorded Investment			$ 3,273,000		$ 5,107,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | item			1		1
Recorded Investment			$ 430,000		$ 481,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item			5		3
Recorded Investment			$ 2,133,000		$ 727,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item			3		8
Recorded Investment			$ 710,000		$ 3,899,000
Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | item	3	2	8	14
Recorded Investment	$ 1,776,000	$ 1,684,000	$ 2,004,000	$ 2,523,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | item	1	1	6	12
Recorded Investment	$ 135,000	$ 63,000	$ 363,000	$ 801,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item			3	5
Recorded Investment			$ 151,000	$ 455,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item				2
Recorded Investment				$ 46,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | item	1	1	3	5
Recorded Investment	$ 135,000	$ 63,000	$ 212,000	$ 300,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | item	2	1	2	2
Recorded Investment	$ 1,641,000	$ 1,621,000	$ 1,641,000	$ 1,722,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | item	1		1
Recorded Investment	$ 137,000		$ 137,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | item	1	1	1	2
Recorded Investment	$ 1,504,000	$ 1,621,000	$ 1,504,000	$ 1,722,000