FAIR VALUE OF ASSETS AND LIABILITIES - Impaired Loans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Assets and liabilities measured on non-recurring basis
Total Losses	$ 1,033,000	$ 462,000	$ 1,085,000	$ 816,000
Residential loans
Assets and liabilities measured on non-recurring basis
Total Losses	584,000		581,000
Commercial loans
Assets and liabilities measured on non-recurring basis
Total Losses	449,000	395,000	449,000	749,000
Other real estate owned and repossessed assets
Assets and liabilities measured on non-recurring basis
Total Losses		$ 67,000	55,000	$ 67,000
Non-recurring
Assets and liabilities measured on non-recurring basis
Fair value	0		0		$ 0
Non-recurring | Level 3
Assets and liabilities measured on non-recurring basis
Fair value	27,617,000		27,617,000		13,133,000
Non-recurring | Level 3 | Asset held for sale
Assets and liabilities measured on non-recurring basis
Fair value	8,536,000		8,536,000		8,536,000
Non-recurring | Level 3 | Residential loans
Assets and liabilities measured on non-recurring basis
Fair value	13,244,000		13,244,000		2,272,000
Non-recurring | Level 3 | Commercial loans
Assets and liabilities measured on non-recurring basis
Fair value	5,300,000		5,300,000		1,606,000
Non-recurring | Level 3 | Other real estate owned and repossessed assets
Assets and liabilities measured on non-recurring basis
Fair value	$ 537,000		$ 537,000		$ 719,000