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FAIR VALUE MEASUREMENTS - Measured on Non-recurring Basis (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assets
Other real estate owned		$ 2,236,000
Non-recurring | Level 3
Assets
Impaired loans	$ 8,746,000	9,625,000
Capitalized servicing rights	3,605,000	4,301,000
Other real estate owned		2,236,000
Premises held for sale	962,000	1,764,000
Total	13,313,000	17,926,000
Total Gains (Losses)	1,342,000
Non-recurring | Level 3 | Impaired loans
Assets
Impaired loans		6,137,000
Total Gains (Losses)	879,000
Non-recurring | Level 3 | Capitalized servicing rights
Assets
Total Gains (Losses)	696,000
Non-recurring | Level 3 | Other real estate owned
Assets
Other real estate owned		$ 2,236,000
Total Gains (Losses)	(355,000)
Non-recurring | Level 3 | Assets held for sale
Assets
Total Gains (Losses)	$ 122,000

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