LOANS - TDR, Recorded Investment and Number of Modifications (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($) item	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($) item	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Borrower's sustained repayment performance period					6 months
Number of Modifications | item	0	5	6	16
Pre-Modification Outstanding Recorded Investment		$ 350	$ 130	$ 1,024
Post-Modification Outstanding Recorded Investment		$ 305	$ 482	$ 977
Number of modifications which subsequently defaulted | item			0
Interest rate and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item			0	0
Post-Modification Outstanding Recorded Investment			$ 0	$ 0
Amortization and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item			0	4
Post-Modification Outstanding Recorded Investment			$ 0	$ 275
Forbearance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item			0	1
Post-Modification Outstanding Recorded Investment			$ 0	$ 77
Forbearance and interest only payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item		2	1	4
Post-Modification Outstanding Recorded Investment		$ 131	$ 25	$ 243
Forbearance and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item		1	0	4
Post-Modification Outstanding Recorded Investment		$ 46	$ 0	$ 249
Maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item			1	0
Post-Modification Outstanding Recorded Investment			$ 9	$ 0
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item		1	0	1
Post-Modification Outstanding Recorded Investment		$ 58	$ 0	$ 58
Interest only payments and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item		1	0	2
Post-Modification Outstanding Recorded Investment		$ 70	$ 0	$ 75
Interest rate, forbearance and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item			4	0
Post-Modification Outstanding Recorded Investment			$ 448	$ 0
Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item		2	1	5
Pre-Modification Outstanding Recorded Investment		$ 186	$ 54	$ 299
Post-Modification Outstanding Recorded Investment		$ 177	$ 252	$ 290
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item		1	3	3
Pre-Modification Outstanding Recorded Investment		$ 12	$ 41	$ 43
Post-Modification Outstanding Recorded Investment		$ 12	$ 196	$ 43
Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item		2		8
Pre-Modification Outstanding Recorded Investment		$ 152		$ 682
Post-Modification Outstanding Recorded Investment		$ 116		$ 644
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item			1
Pre-Modification Outstanding Recorded Investment			$ 26
Post-Modification Outstanding Recorded Investment			$ 25
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications | item			1
Pre-Modification Outstanding Recorded Investment			$ 9
Post-Modification Outstanding Recorded Investment			9
Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of bank-owned residential real estate property	$ 2,300		2,300		$ 2,300
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans collateralized by real estate property in the process of foreclosure			$ 537		$ 810