FAIR VALUE (Quantitative Information about Level 3 fair value measurements) (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative instruments	$ 0	$ 0
Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative instruments	696	1,306
Discounted cash flows
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	8,102	6,890
Modified appraised value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	1,422	1,927
Modified appraised value | Agricultural and agricultural real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	9,514	11,404
Modified appraised value | Residential real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	863	855
Modified appraised value | Real Estate Construction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	1,984
Modified appraised value | Premises, furniture and equipment held for sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale	14,073	10,828
Interest rate lock commitments | Discounted cash flows
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative instruments	$ 696	$ 1,306
Closing ratio | Discounted cash flows | Weighted Average | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.88	0.88
Closing ratio | Discounted cash flows | Minimum | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0	0
Closing ratio | Discounted cash flows | Maximum | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.99	0.99
Appraisal discount | Modified appraised value | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%	0.00%
Appraisal discount | Modified appraised value | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	10.00%	10.00%
Appraisal discount | Modified appraised value | Real Estate Construction | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%
Appraisal discount | Modified appraised value | Real Estate Construction | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	10.00%
Appraisal discount | Modified appraised value | Premises, furniture and equipment held for sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%	0.00%
Appraisal discount | Modified appraised value | Premises, furniture and equipment held for sale | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	10.00%	10.00%
Valuation discount | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	9.01%	9.02%
Valuation discount | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	9.00%	9.00%
Valuation discount | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	11.00%	11.00%
Measurement Input, Constant Prepayment Rate | Modified appraised value | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	9.08%	13.40%
Measurement Input, Constant Prepayment Rate | Modified appraised value | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	9.80%	13.10%
Measurement Input, Constant Prepayment Rate | Modified appraised value | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	20.00%	18.60%
Commercial and industrial | Modified appraised value | Commercial and industrial
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 10,547	$ 8,989
Commercial and industrial | Modified appraised value | Owner occupied commercial real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	9,247	8,447
Commercial and industrial | Modified appraised value | Non-owner occupied commercial real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 11,738	$ 11,946
Commercial and industrial | Appraisal discount | Modified appraised value | Commercial and industrial | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%	0.00%
Commercial and industrial | Appraisal discount | Modified appraised value | Commercial and industrial | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	6.00%	6.00%
Commercial and industrial | Appraisal discount | Modified appraised value | Owner occupied commercial real estate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%	0.00%
Commercial and industrial | Appraisal discount | Modified appraised value | Owner occupied commercial real estate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	7.00%	7.00%
Commercial and industrial | Appraisal discount | Modified appraised value | Non-owner occupied commercial real estate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%	0.00%
Commercial and industrial | Appraisal discount | Modified appraised value | Non-owner occupied commercial real estate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	10.00%	10.00%
Agricultural and agricultural real estate | Appraisal discount | Modified appraised value | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%	0.00%
Agricultural and agricultural real estate | Appraisal discount | Modified appraised value | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	9.00%	7.00%
Residential real estate | Appraisal discount | Modified appraised value | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	0.00%	0.00%
Residential real estate | Appraisal discount | Modified appraised value | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate (as a percent)	7.00%	7.00%