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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Impaired Financing Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	$ 21,220	$ 27,160
Recorded Investment With No Allowance	14,865	16,802
Recorded Investment With Allowance	4,807	6,648
Total Recorded Investment	19,672	23,450
Related Allowance	735	676
Average Recorded Investment	21,294	24,743	$ 22,392
Interest Income Recognized	558	786	750
Interest Income Recognized Cash Basis	24	20	59
Real Estate Loans [Member] | Mortgages [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	1,212	932
Recorded Investment With No Allowance	794	515
Recorded Investment With Allowance	223	288
Total Recorded Investment	1,017	803
Related Allowance	20	10
Average Recorded Investment	1,062	944	900
Interest Income Recognized	16	13	13
Interest Income Recognized Cash Basis	0	0	0
Real Estate Loans [Member] | Home Equity [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	170	106
Recorded Investment With No Allowance	83	12
Recorded Investment With Allowance	66	75
Total Recorded Investment	149	87
Related Allowance	12	14
Average Recorded Investment	119	95	67
Interest Income Recognized	6	4	4
Interest Income Recognized Cash Basis	0	0	0
Real Estate Loans [Member] | Commercial [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	12,070	16,326
Recorded Investment With No Allowance	10,723	11,933
Recorded Investment With Allowance	814	1,394
Total Recorded Investment	11,537	13,327
Related Allowance	251	216
Average Recorded Investment	11,756	13,907	11,567
Interest Income Recognized	453	506	385
Interest Income Recognized Cash Basis	24	20	7
Real Estate Loans [Member] | Agricultural [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	3,900	5,598
Recorded Investment With No Allowance	1,580	2,386
Recorded Investment With Allowance	2,202	3,206
Total Recorded Investment	3,782	5,592
Related Allowance	151	84
Average Recorded Investment	4,899	4,736	3,574
Interest Income Recognized	78	151	131
Interest Income Recognized Cash Basis	0	0	0
Consumer [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	4
Recorded Investment With No Allowance	4
Recorded Investment With Allowance	0
Total Recorded Investment	4
Related Allowance	0
Average Recorded Investment	2	1	3
Interest Income Recognized	0	0	0
Interest Income Recognized Cash Basis	0	0	0
Other Commercial Loans [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	2,517	2,711
Recorded Investment With No Allowance	1,555	1,836
Recorded Investment With Allowance	347	370
Total Recorded Investment	1,902	2,206
Related Allowance	147	193
Average Recorded Investment	2,056	3,659	4,790
Interest Income Recognized	1	89	152
Interest Income Recognized Cash Basis	0	0	52
Other Agricultural Loans [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	1,347	1,487
Recorded Investment With No Allowance	126	120
Recorded Investment With Allowance	1,155	1,315
Total Recorded Investment	1,281	1,435
Related Allowance	154	159
Average Recorded Investment	1,400	1,401	1,491
Interest Income Recognized	4	23	65
Interest Income Recognized Cash Basis	$ 0	$ 0	$ 0

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