ALLOWANCE FOR LOAN LOSSES: Recorded Investments in Nonperforming Loans (Details) - Nonperforming Financing Receivable - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	$ 543	$ 2,458
Non-accrual	9,590	15,367
Nonaccrual With No Allowance for Credit Loss	4,593	4,457
Commercial & Industrial | Commercial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	14	0
Non-accrual	1,950	4,838
Nonaccrual With No Allowance for Credit Loss	1,662	1,080
Farmland | Commercial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	0
Non-accrual	15	195
Nonaccrual With No Allowance for Credit Loss	0	0
Non Farm, Non Residential | Commercial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	0
Non-accrual	2,911	3,729
Nonaccrual With No Allowance for Credit Loss	2,898	3,267
Agriculture | Commercial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	0
Non-accrual	111	409
Nonaccrual With No Allowance for Credit Loss	0	0
All Other Commercial | Commercial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	0
Non-accrual	4	533
Nonaccrual With No Allowance for Credit Loss	0	24
First Liens | Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	346	1,746
Non-accrual	2,339	2,604
Nonaccrual With No Allowance for Credit Loss	33	86
Home Equity | Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	88
Non-accrual	84	30
Nonaccrual With No Allowance for Credit Loss	0	0
Junior Liens | Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	89	252
Non-accrual	294	206
Nonaccrual With No Allowance for Credit Loss	0	0
Multifamily | Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	0
Non-accrual	225	1,380
Nonaccrual With No Allowance for Credit Loss	0	0
All Other Residential | Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	0
Non-accrual	107	135
Nonaccrual With No Allowance for Credit Loss	0	0
Motor Vehicle | Consumer
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	94	372
Non-accrual	864	754
Nonaccrual With No Allowance for Credit Loss	0	0
All Other Consumer | Consumer
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0	0
Non-accrual	686	554
Nonaccrual With No Allowance for Credit Loss	$ 0	$ 0