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LOANS AND ALLOWANCE FOR LOAN LOSSES (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve for unfunded commitments	$ 11,000	$ 15,000	$ 11,000	$ 15,000	$ 22,000
Activity in ALL:
Beginning balance	26,163,000	23,668,000	24,712,000	24,171,000	24,171,000
Loans charged off	(1,303,000)	(659,000)	(1,910,000)	(1,851,000)	(2,248,000)
Recoveries	95,000	162,000	228,000	361,000	1,944,000
Provision (credit)(1)	733,000	355,000	2,658,000	845,000	845,000
Ending balance	25,688,000	23,526,000	25,688,000	23,526,000	24,712,000
Ending Balance: Individually evaluated for impairment	738,000	756,000	738,000	756,000	824,000
Ending Balance: Collectively evaluated for impairment	24,950,000	22,770,000	24,950,000	22,770,000	23,888,000
Ending Balance: Individually evaluated for impairment	5,517,000	12,112,000	5,517,000	12,112,000	6,926,000
Ending Balance: Collectively evaluated for impairment	3,105,117,000	2,896,731,000	3,105,117,000	2,896,731,000	3,019,296,000
Total Loans Outstanding	3,110,634,000	2,908,843,000	3,110,634,000	2,908,843,000	3,026,222,000
Residential Real Estate
Activity in ALL:
Beginning balance	6,249,000	5,779,000	6,071,000	5,086,000	5,086,000
Loans charged off	(411,000)	(115,000)	(436,000)	(231,000)	(173,000)
Recoveries	2,000	37,000	6,000	52,000	90,000
Provision (credit)(1)	382,000	59,000	581,000	853,000	1,068,000
Ending balance	6,222,000	5,760,000	6,222,000	5,760,000	6,071,000
Ending Balance: Individually evaluated for impairment	337,000	619,000	337,000	619,000	586,000
Ending Balance: Collectively evaluated for impairment	5,885,000	5,141,000	5,885,000	5,141,000	5,485,000
Ending Balance: Individually evaluated for impairment	3,880,000	5,184,000	3,880,000	5,184,000	4,762,000
Ending Balance: Collectively evaluated for impairment	1,058,018,000	936,304,000	1,058,018,000	936,304,000	988,104,000
Total Loans Outstanding	1,061,898,000	941,488,000	1,061,898,000	941,488,000	992,866,000
Commercial Real Estate
Activity in ALL:
Beginning balance	12,152,000	10,310,000	11,654,000	11,863,000	11,863,000
Loans charged off	(92,000)	0	(157,000)	(512,000)	(512,000)
Recoveries	34,000	4,000	41,000	19,000	28,000
Provision (credit)(1)	(18,000)	268,000	538,000	(788,000)	275,000
Ending balance	12,076,000	10,582,000	12,076,000	10,582,000	11,654,000
Ending Balance: Individually evaluated for impairment	29,000	23,000	29,000	23,000	23,000
Ending Balance: Collectively evaluated for impairment	12,047,000	10,559,000	12,047,000	10,559,000	11,631,000
Ending Balance: Individually evaluated for impairment	406,000	5,007,000	406,000	5,007,000	930,000
Ending Balance: Collectively evaluated for impairment	1,255,113,000	1,210,972,000	1,255,113,000	1,210,972,000	1,268,603,000
Total Loans Outstanding	1,255,519,000	1,215,979,000	1,255,519,000	1,215,979,000	1,269,533,000
Commercial
Activity in ALL:
Beginning balance	4,107,000	4,303,000	3,620,000	4,171,000	4,171,000
Loans charged off	(183,000)	(150,000)	(636,000)	(448,000)	(736,000)
Recoveries	56,000	117,000	167,000	237,000	1,770,000
Provision (credit)(1)	124,000	(302,000)	953,000	8,000	(1,585,000)
Ending balance	4,104,000	3,968,000	4,104,000	3,968,000	3,620,000
Ending Balance: Individually evaluated for impairment	303,000	0	303,000	0	53,000
Ending Balance: Collectively evaluated for impairment	3,801,000	3,968,000	3,801,000	3,968,000	3,567,000
Ending Balance: Individually evaluated for impairment	646,000	1,548,000	646,000	1,548,000	786,000
Ending Balance: Collectively evaluated for impairment	421,108,000	367,289,000	421,108,000	367,289,000	380,994,000
Total Loans Outstanding	421,754,000	368,837,000	421,754,000	368,837,000	381,780,000
Home Equity
Activity in ALL:
Beginning balance	2,992,000	2,616,000	2,796,000	2,367,000	2,367,000
Loans charged off	(348,000)	(157,000)	(392,000)	(381,000)	(476,000)
Recoveries	0	0	0	44,000	44,000
Provision (credit)(1)	132,000	116,000	372,000	545,000	861,000
Ending balance	2,776,000	2,575,000	2,776,000	2,575,000	2,796,000
Ending Balance: Individually evaluated for impairment	69,000	114,000	69,000	114,000	162,000
Ending Balance: Collectively evaluated for impairment	2,707,000	2,461,000	2,707,000	2,461,000	2,634,000
Ending Balance: Individually evaluated for impairment	585,000	373,000	585,000	373,000	442,000
Ending Balance: Collectively evaluated for impairment	322,979,000	325,079,000	322,979,000	325,079,000	327,321,000
Total Loans Outstanding	323,564,000	325,452,000	323,564,000	325,452,000	327,763,000
Consumer
Activity in ALL:
Beginning balance	383,000	260,000	234,000	233,000	233,000
Loans charged off	(258,000)	(28,000)	(278,000)	(70,000)	(96,000)
Recoveries	3,000	3,000	14,000	8,000	11,000
Provision (credit)(1)	145,000	38,000	303,000	102,000	86,000
Ending balance	273,000	273,000	273,000	273,000	234,000
Ending Balance: Individually evaluated for impairment	0	0	0	0
Ending Balance: Collectively evaluated for impairment	273,000	273,000	273,000	273,000	234,000
Ending Balance: Individually evaluated for impairment	0	0	0	0	6,000
Ending Balance: Collectively evaluated for impairment	24,187,000	20,258,000	24,187,000	20,258,000	20,618,000
Total Loans Outstanding	24,187,000	20,258,000	24,187,000	20,258,000	20,624,000
HPFC Portfolio Segment
Activity in ALL:
Beginning balance	280,000	400,000	337,000	451,000	451,000
Loans charged off	(11,000)	(209,000)	(11,000)	(209,000)	(255,000)
Recoveries	0	1,000	0	1,000	1,000
Provision (credit)(1)	(32,000)	176,000	(89,000)	125,000	140,000
Ending balance	237,000	368,000	237,000	368,000	337,000
Ending Balance: Individually evaluated for impairment	0	0	0	0
Ending Balance: Collectively evaluated for impairment	237,000	368,000	237,000	368,000	337,000
Ending Balance: Individually evaluated for impairment	0	0	0	0
Ending Balance: Collectively evaluated for impairment	23,712,000	36,829,000	23,712,000	36,829,000	33,656,000
Total Loans Outstanding	$ 23,712,000	$ 36,829,000	$ 23,712,000	$ 36,829,000	$ 33,656,000

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