LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - TDR MODIFICATIONS (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Troubled Debt Restructurings disclosures
Number of Loans | loan	308	347	347
Recorded Investment	$ 41,586,000	$ 49,580,000	$ 49,580,000
Commitments to lend any additional material amounts to existing TDR relationships	0	0
Change between the pre and post modification loan	$ 0	$ 0	$ 0
Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	277	307
Recorded Investment	$ 28,753,000	$ 35,209,000
Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	3	2
Recorded Investment	$ 648,000	$ 631,000
Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	205	229
Recorded Investment	$ 24,338,000	$ 30,384,000
Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	14	16
Recorded Investment	$ 922,000	$ 1,560,000
Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	55	60
Recorded Investment	$ 2,845,000	$ 2,634,000
Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan	31	40
Recorded Investment	$ 12,833,000	$ 14,371,000
Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	6	7
Recorded Investment	$ 3,079,000	$ 1,998,000
Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	10	13
Recorded Investment	$ 4,997,000	$ 5,748,000
Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	15	20
Recorded Investment	$ 4,757,000	$ 6,625,000
Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	28	44	103
Recorded Investment	$ 6,417,000	$ 7,536,000	$ 17,082,000
Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	21	32	77
Recorded Investment	$ 1,921,000	$ 3,642,000	$ 7,689,000
Modified During The Period | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1	4
Recorded Investment	$ 146,000	$ 617,000	$ 389,000
Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	9	22	32
Recorded Investment	$ 715,000	$ 2,667,000	$ 4,047,000
Modified During The Period | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan		2	6
Recorded Investment		$ 43,000	$ 848,000
Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	11	7	35
Recorded Investment	$ 1,060,000	$ 315,000	$ 2,405,000
Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan	7	12	26
Recorded Investment	$ 4,496,000	$ 3,894,000	$ 9,393,000
Modified During The Period | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	3	6
Recorded Investment	$ 1,718,000	$ 465,000	$ 1,570,000
Modified During The Period | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	3	1	11
Recorded Investment	$ 884,000	$ 815,000	$ 4,995,000
Modified During The Period | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	8	9
Recorded Investment	$ 1,894,000	$ 2,614,000	$ 2,828,000
Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	197	252
Recorded Investment	$ 29,874,000	$ 36,644,000
Percentage of troubled debt restructurings performing as per terms of modifications	72.00%	74.00%
Specific reserve allocations made to customers	$ 4,000,000	$ 5,000,000
Percentage of Bank's TDRs that occurred during period, which were performing according to their modified terms	62.00%	65.00%	68.00%
Specific reserve allocations made to customers whose loan terms were modified in TDRs during period	$ 377,000	$ 300,000	$ 1,000,000
Performing Financing Receivable | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	174	224
Recorded Investment	$ 19,702,000	$ 27,380,000
Performing Financing Receivable | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	2
Recorded Investment	$ 155,000	$ 631,000
Performing Financing Receivable | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	148	183
Recorded Investment	$ 18,125,000	$ 24,734,000
Performing Financing Receivable | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	7	9
Recorded Investment	$ 616,000	$ 789,000
Performing Financing Receivable | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	17	30
Recorded Investment	$ 806,000	$ 1,226,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan	23	28
Recorded Investment	$ 10,172,000	$ 9,264,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	5	6
Recorded Investment	$ 2,666,000	$ 1,517,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	8	10
Recorded Investment	$ 4,769,000	$ 5,021,000
Performing Financing Receivable | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	10	12
Recorded Investment	$ 2,737,000	$ 2,726,000
Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	16	29	66
Recorded Investment	$ 3,963,000	$ 4,914,000	$ 11,638,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	11	21	46
Recorded Investment	$ 1,031,000	$ 2,918,000	$ 4,940,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 146,000	$ 617,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	6	17	21
Recorded Investment	$ 566,000	$ 2,148,000	$ 2,274,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			5
Recorded Investment			$ 820,000
Performing Financing Receivable | Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	3	20
Recorded Investment	$ 319,000	$ 153,000	$ 1,846,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan	5	8	20
Recorded Investment	$ 2,932,000	$ 1,996,000	$ 6,698,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	3	4
Recorded Investment	$ 1,718,000	$ 465,000	$ 1,185,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	1	9
Recorded Investment	$ 749,000	$ 815,000	$ 4,411,000
Performing Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	4	7
Recorded Investment	$ 465,000	$ 716,000	$ 1,102,000
Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	111	95
Recorded Investment	$ 11,712,000	$ 12,936,000
Nonperforming Financing Receivable | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	103	83
Recorded Investment	$ 9,051,000	$ 7,829,000
Nonperforming Financing Receivable | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1
Recorded Investment	$ 493,000
Nonperforming Financing Receivable | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	57	46
Recorded Investment	$ 6,213,000	$ 5,650,000
Nonperforming Financing Receivable | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	7	7
Recorded Investment	$ 306,000	$ 771,000
Nonperforming Financing Receivable | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	38	30
Recorded Investment	$ 2,039,000	$ 1,408,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan	8	12
Recorded Investment	$ 2,661,000	$ 5,107,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 413,000	$ 481,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	3
Recorded Investment	$ 228,000	$ 727,000
Nonperforming Financing Receivable | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	5	8
Recorded Investment	$ 2,020,000	$ 3,899,000
Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	12	15	37
Recorded Investment	$ 2,454,000	$ 2,622,000	$ 5,444,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	10	11	31
Recorded Investment	$ 890,000	$ 724,000	$ 2,749,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			4
Recorded Investment			$ 389,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	3	5	11
Recorded Investment	$ 149,000	$ 519,000	$ 1,773,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan		2	1
Recorded Investment		$ 43,000	$ 28,000
Nonperforming Financing Receivable | Modified During The Period | Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	7	4	15
Recorded Investment	$ 741,000	$ 162,000	$ 559,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	4	6
Recorded Investment	$ 1,564,000	$ 1,898,000	$ 2,695,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			2
Recorded Investment			$ 385,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	1		2
Recorded Investment	$ 135,000		$ 584,000
Nonperforming Financing Receivable | Modified During The Period | Commercial Real Estate and Commercial Construction | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	4	2
Recorded Investment	$ 1,429,000	$ 1,898,000	$ 1,726,000