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FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) - Non-recurring - Level 3 - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Individually evaluated loans	$ 6,874	$ 8,324
Capitalized servicing rights	6,778	5,263
Premises held for sale	327	226
Total	13,979	13,813
Quoted prices for similar loans in active markets
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Individually evaluated loans	3,135	4,780
Discount Cash Flows
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Individually evaluated loans	$ 3,739	$ 3,544
Impaired loans | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Loss severity	10.00%	10.00%
Appraised value	$ 71	$ 71
Cash flows	$ 5	$ 6
Discount rate	2.88%	2.88%
Impaired loans | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Loss severity	70.00%	70.00%
Appraised value	$ 1,175	$ 1,792
Cash flows	$ 943	$ 931
Discount rate	6.45%	9.50%
Capitalized servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Constant prepayment rate (CPR)	8.31%	12.47%
Discount rate	9.05%	9.53%
Assets held for sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Premises held for sale	$ 327	$ 226
Selling Costs	6.00%	6.00%
Assets held for sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items}
Appraised value	$ 347	$ 240

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The balance of financing receivables that were individually evaluated for impairment.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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