LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR MODIFICATIONS (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Dec. 31, 2020 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			2,621		2,388
Recorded Investment			$ 18,313,000		$ 20,778,000
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
Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	292	891	600	897
Recorded Investment	$ 330,000	$ 529,000	$ 767,000	$ 685,000
Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			2,605		2,371
Recorded Investment			$ 14,935,000		$ 17,317,000
Percentage of troubled debt restructurings performing as per terms of modifications	82.00%		82.00%		83.00%
Specific reserve allocations made to customers	$ 1,000,000		$ 1,000,000		$ 1,000,000
Percentage of Bank's TDRs that occurred during period, which were performing according to their modified terms	85.00%	57.00%	67.00%	66.00%
Specific ACLL allocations made to customers whose loan terms were modified in TDRs during period	$ 18,000	$ 0	$ 35,000	$ 28,000
Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	291	889	597	894
Recorded Investment	$ 280,000	$ 302,000	$ 512,000	$ 454,000
Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			16		17
Recorded Investment			$ 3,378,000		$ 3,461,000
Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	2	3	3
Recorded Investment	$ 50,000	$ 227,000	$ 255,000	$ 231,000
Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan			170		184
Recorded Investment			$ 13,856,000		$ 15,230,000
Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		1
Recorded Investment			$ 774,000		$ 826,000
Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			97		107
Recorded Investment			$ 8,787,000		$ 9,896,000
Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			9		11
Recorded Investment			$ 820,000		$ 1,024,000
Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			63		65
Recorded Investment			$ 3,475,000		$ 3,484,000
Residential Real Estate | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	5	6	9	10
Recorded Investment	$ 292,000	$ 270,000	$ 695,000	$ 396,000
Residential Real Estate | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	1		1
Recorded Investment	$ 16,000		$ 161,000
Residential Real Estate | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	6	8	10
Recorded Investment	$ 276,000	$ 270,000	$ 534,000	$ 396,000
Residential Real Estate | Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			156		169
Recorded Investment			$ 13,069,000		$ 14,278,000
Residential Real Estate | Performing Financing Receivable | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		1
Recorded Investment			$ 774,000		$ 826,000
Residential Real Estate | Performing Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			91		101
Recorded Investment			$ 8,391,000		$ 9,526,000
Residential Real Estate | Performing Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			8		9
Recorded Investment			$ 819,000		$ 858,000
Residential Real Estate | Performing Financing Receivable | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			56		58
Recorded Investment			$ 3,085,000		$ 3,068,000
Residential Real Estate | Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	5	6	8
Recorded Investment	$ 242,000	$ 161,000	$ 440,000	$ 283,000
Residential Real Estate | Performing Financing Receivable | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	1		1
Recorded Investment	$ 16,000		$ 161,000
Residential Real Estate | Performing Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	3	5	5	8
Recorded Investment	$ 226,000	$ 161,000	$ 279,000	$ 283,000
Residential Real Estate | Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			14		15
Recorded Investment			$ 787,000		$ 952,000
Residential Real Estate | Nonperforming Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			6		6
Recorded Investment			$ 396,000		$ 370,000
Residential Real Estate | Nonperforming Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		2
Recorded Investment			$ 1,000		$ 166,000
Residential Real Estate | Nonperforming Financing Receivable | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			7		7
Recorded Investment			$ 390,000		$ 416,000
Residential Real Estate | Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1	3	2
Recorded Investment	$ 50,000	$ 109,000	$ 255,000	$ 113,000
Residential Real Estate | Nonperforming Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1	3	2
Recorded Investment	$ 50,000	$ 109,000	$ 255,000	$ 113,000
Commercial Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan			4		7
Recorded Investment			$ 3,871,000		$ 4,904,000
Commercial related and construction/land development
Troubled Debt Restructurings disclosures
Number of Loans | loan			6		9
Recorded Investment			$ 3,872,000		$ 4,949,000
Commercial related and construction/land development | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan					1
Recorded Investment					$ 488,000
Commercial related and construction/land development | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		3
Recorded Investment			$ 947,000		$ 1,091,000
Commercial related and construction/land development | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			5		5
Recorded Investment			$ 2,925,000		$ 3,370,000
Commercial related and construction/land development | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan		1		2
Recorded Investment		$ 118,000		$ 139,000
Commercial related and construction/land development | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan				1
Recorded Investment				$ 21,000
Commercial related and construction/land development | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan		1		1
Recorded Investment		$ 118,000		$ 118,000
Commercial related and construction/land development | Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			4		7
Recorded Investment			$ 1,281,000		$ 2,440,000
Commercial related and construction/land development | Performing Financing Receivable | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan					1
Recorded Investment					$ 488,000
Commercial related and construction/land development | Performing Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan			1		2
Recorded Investment			$ 947,000		$ 1,046,000
Commercial related and construction/land development | Performing Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			3		4
Recorded Investment			$ 334,000		$ 906,000
Commercial related and construction/land development | Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan				1
Recorded Investment				$ 21,000
Commercial related and construction/land development | Performing Financing Receivable | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan				1
Recorded Investment				$ 21,000
Commercial related and construction/land development | Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			2		2
Recorded Investment			$ 2,591,000		$ 2,509,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan					1
Recorded Investment					$ 45,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			2		1
Recorded Investment			$ 2,591,000		$ 2,464,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan		1		1
Recorded Investment		$ 118,000		$ 118,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan		1		1
Recorded Investment		$ 118,000		$ 118,000
Consumer
Troubled Debt Restructurings disclosures
Number of Loans | loan			2,445		2,195
Recorded Investment			$ 585,000		$ 599,000
Consumer | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			2,441		2,193
Recorded Investment			$ 563,000		$ 578,000
Consumer | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			4		2
Recorded Investment			$ 22,000		$ 21,000
Consumer | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	287	884	591	885
Recorded Investment	$ 38,000	$ 141,000	$ 72,000	$ 150,000
Consumer | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	286	884	589	884
Recorded Investment	$ 38,000	$ 141,000	$ 69,000	$ 141,000
Consumer | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	1		2	1
Recorded Investment			$ 3,000	$ 9,000
Consumer | Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan			2,445		2,195
Recorded Investment			$ 585,000		$ 599,000
Consumer | Performing Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan			2,441		2,193
Recorded Investment			$ 563,000		$ 578,000
Consumer | Performing Financing Receivable | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan			4		2
Recorded Investment			$ 22,000		$ 21,000
Consumer | Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	287	884	591	885
Recorded Investment	$ 38,000	$ 141,000	$ 72,000	$ 150,000
Consumer | Performing Financing Receivable | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	286	884	589	884
Recorded Investment	$ 38,000	$ 141,000	$ 69,000	$ 141,000
Consumer | Performing Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	1		2	1
Recorded Investment			$ 3,000	$ 9,000