FAIR VALUE DISCLOSURES, Quantitative Information about Recurring and Non-Recurring Level 3 Fair Value Measurements (Details) $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights	$ 25,425	$ 19,700	$ 13,558	$ 9,049
Non-recurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Impaired loans	6,815	6,427
Non-recurring [Member] | Third Party Appraisals or Inspections [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Impaired loans	$ 6,815	$ 6,427
Non-recurring [Member] | Third Party Appraisals or Inspections [Member] | Collateral Discounts and Selling Costs [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Impaired loans, discounts	0.20	0.20
Non-recurring [Member] | Third Party Appraisals or Inspections [Member] | Collateral Discounts and Selling Costs [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Impaired loans, discounts	1	1
Recurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights	$ 25,425	$ 19,700
Recurring [Member] | Discounted Cash Flows [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights	$ 25,425	$ 19,700
Recurring [Member] | Discounted Cash Flows [Member] | Conditional Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, discounts	0.0848	0.1235
Recurring [Member] | Discounted Cash Flows [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mortgage servicing rights, discounts	0.0863	0.0914