LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - TDR MODIFICATIONS (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan	Dec. 31, 2016 USD ($) loan
Troubled Debt Restructurings disclosures
Period of time loans are not past due in which TDR loans are performing			30 days
Number of Loans | loan			288		308
Recorded Investment			$ 36,718,000		$ 41,586,000
Commitments to lend any additional material amounts to existing TDR relationships	$ 0		0		$ 0
Change between the pre and post modification loan	$ 0	$ 0	$ 0	$ 0
Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan			264		277
Recorded Investment			$ 27,415,000		$ 28,753,000
Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			2		3
Recorded Investment			$ 483,000		$ 648,000
Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			198		205
Recorded Investment			$ 23,295,000		$ 24,338,000
Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			14		14
Recorded Investment			$ 1,378,000		$ 922,000
Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			50		55
Recorded Investment			$ 2,259,000		$ 2,845,000
Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan			24		31
Recorded Investment			$ 9,303,000		$ 12,833,000
Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			4		6
Recorded Investment			$ 1,281,000		$ 3,079,000
Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			9		10
Recorded Investment			$ 4,253,000		$ 4,997,000
Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			11		15
Recorded Investment			$ 3,769,000		$ 4,757,000
Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	3
Recorded Investment	$ 1,041,000	$ 231,000
Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	3	5	10
Recorded Investment	$ 1,041,000	$ 231,000	$ 1,200,000	$ 506,000
Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	3	2	6
Recorded Investment	$ 220,000	$ 231,000	$ 379,000	$ 340,000
Modified During The Period | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2		2
Recorded Investment	$ 810,000		$ 810,000
Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	1		1	4
Recorded Investment	$ 11,000		$ 11,000	$ 166,000
Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan			5	10
Recorded Investment			$ 1,200,000	$ 506,000
Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			194		197
Recorded Investment			$ 26,632,000		$ 29,874,000
Percentage of troubled debt restructurings performing as per terms of modifications	73.00%		73.00%		72.00%
Specific reserve allocations made to customers	$ 3,000,000		$ 3,000,000		$ 4,000,000
Percentage of Bank's TDRs that occurred during period, which were performing according to their modified terms	100.00%	58.00%	100.00%	54.00%
Specific reserve allocations made to customers whose loan terms were modified in TDRs during period	$ 30,000	$ 29,000	$ 65,000	$ 45,000
Performing Financing Receivable | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan			178		174
Recorded Investment			$ 19,876,000		$ 19,702,000
Performing Financing Receivable | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		2
Recorded Investment			$ 7,000		$ 155,000
Performing Financing Receivable | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			148		148
Recorded Investment			$ 17,824,000		$ 18,125,000
Performing Financing Receivable | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			12		7
Recorded Investment			$ 1,254,000		$ 616,000
Performing Financing Receivable | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			17		17
Recorded Investment			$ 791,000		$ 806,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan			16		23
Recorded Investment			$ 6,756,000		$ 10,172,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			3		5
Recorded Investment			$ 893,000		$ 2,666,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			7		8
Recorded Investment			$ 4,032,000		$ 4,769,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			6		10
Recorded Investment			$ 1,831,000		$ 2,737,000
Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	1
Recorded Investment	$ 1,041,000	$ 133,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	1	5	5
Recorded Investment	$ 1,041,000	$ 133,000	$ 1,200,000	$ 275,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1	2	3
Recorded Investment	$ 220,000	$ 133,000	$ 379,000	$ 187,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2		2
Recorded Investment	$ 810,000		$ 810,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	1		1	2
Recorded Investment	$ 11,000		$ 11,000	$ 88,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan			5	5
Recorded Investment			$ 1,200,000	$ 275,000
Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			94		111
Recorded Investment			$ 10,086,000		$ 11,712,000
Nonperforming Financing Receivable | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan			86		103
Recorded Investment			$ 7,539,000		$ 9,051,000
Nonperforming Financing Receivable | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		1
Recorded Investment			$ 476,000		$ 493,000
Nonperforming Financing Receivable | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			50		57
Recorded Investment			$ 5,471,000		$ 6,213,000
Nonperforming Financing Receivable | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			2		7
Recorded Investment			$ 124,000		$ 306,000
Nonperforming Financing Receivable | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			33		38
Recorded Investment			$ 1,468,000		$ 2,039,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan			8		8
Recorded Investment			$ 2,547,000		$ 2,661,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		1
Recorded Investment			$ 388,000		$ 413,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			2		2
Recorded Investment			$ 221,000		$ 228,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			5		5
Recorded Investment			$ 1,938,000		$ 2,020,000
Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan		2
Recorded Investment		$ 98,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan		2		5
Recorded Investment		$ 98,000		$ 231,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan		2		3
Recorded Investment		$ 98,000		$ 153,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan				2
Recorded Investment				$ 78,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan				5
Recorded Investment				$ 231,000