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Loans and Allowance for Credit Losses (Schedule of Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Loans with no related allowance recorded:
Recorded Investment	$ 2,344		$ 2,344		$ 1,531
Unpaid Principal Balance	2,434		2,434		1,657
Related Allowance
Average Recorded Investment			4,389		2,481
Interest Income Recognized			176		69
Loans with an allowance recorded:
Recorded Investment	667		667		4,232
Unpaid Principal Balance	667		667		4,232
Related Allowance	152		152		1,131
Average Recorded Investment			2		2,147
Interest Income Recognized					91
Total impaired loans
Recorded Investment	3,011		3,011		5,763
Unpaid Principal Balance	3,101		3,101		5,889
Related Allowance	152		152		1,131
Average Recorded Investment	2,012	$ 5,060	4,391	$ 4,062	4,628
Interest Income Recognized	38	$ 31	176	$ 72	160
Commercial real estate [Member]
Loans with no related allowance recorded:
Recorded Investment	1,967		1,967		1,062
Unpaid Principal Balance	2,006		2,006		1,153
Related Allowance
Average Recorded Investment			3,960		1,968
Interest Income Recognized			161		46
Loans with an allowance recorded:
Recorded Investment	572		572		4,232
Unpaid Principal Balance	572		572		4,232
Related Allowance	57		57		1,131
Average Recorded Investment			2		2,147
Interest Income Recognized					91
Total impaired loans
Recorded Investment	2,539		2,539		5,294
Unpaid Principal Balance	2,578		2,578		5,385
Related Allowance	57		57		1,131
Average Recorded Investment			3,962		4,115
Interest Income Recognized			161		137
Commercial real estate [Member] \| Mortgages [Member]
Loans with no related allowance recorded:
Recorded Investment	247		247		256
Unpaid Principal Balance	285		285		318
Related Allowance
Average Recorded Investment			2,802		798
Interest Income Recognized			116
Loans with an allowance recorded:
Recorded Investment					3,581
Unpaid Principal Balance					3,581
Related Allowance					1,110
Average Recorded Investment					1,468
Interest Income Recognized					57
Total impaired loans
Recorded Investment	247		247		3,837
Unpaid Principal Balance	285		285		3,899
Related Allowance					1,110
Average Recorded Investment			2,802		2,266
Interest Income Recognized			116		57
Commercial real estate [Member] \| Agricultural Sector [Member]
Loans with no related allowance recorded:
Recorded Investment	1,720		1,720		806
Unpaid Principal Balance	1,721		1,721		835
Related Allowance
Average Recorded Investment			1,158		1,170
Interest Income Recognized			45		46
Loans with an allowance recorded:
Recorded Investment	572		572		651
Unpaid Principal Balance	572		572		651
Related Allowance	57		57		21
Average Recorded Investment			2		679
Interest Income Recognized					34
Total impaired loans
Recorded Investment	2,292		2,292		1,457
Unpaid Principal Balance	2,293		2,293		1,486
Related Allowance	57		57		21
Average Recorded Investment			1,160		1,849
Interest Income Recognized			45		80
Commercial real estate [Member] \| Construction [Member]
Loans with no related allowance recorded:
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Loans with an allowance recorded:
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Total impaired loans
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Commercial and Industrial Sector [Member]
Loans with no related allowance recorded:
Recorded Investment	377		377		469
Unpaid Principal Balance	428		428		504
Related Allowance
Average Recorded Investment			429		513
Interest Income Recognized			15		23
Loans with an allowance recorded:
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Total impaired loans
Recorded Investment	377		377		469
Unpaid Principal Balance	428		428		504
Related Allowance
Average Recorded Investment			429		513
Interest Income Recognized			15		23
Commercial and Industrial Sector [Member] \| Tax-free loans [Member]
Loans with no related allowance recorded:
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Loans with an allowance recorded:
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Total impaired loans
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Commercial and Industrial Sector [Member] \| Agriculture loans [Member]
Loans with no related allowance recorded:
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Loans with an allowance recorded:
Recorded Investment	95		95
Unpaid Principal Balance	95		95
Related Allowance	95		95
Average Recorded Investment
Interest Income Recognized
Total impaired loans
Recorded Investment	95		95
Unpaid Principal Balance	95		95
Related Allowance	95		95
Average Recorded Investment
Interest Income Recognized
Total Commercial and Industrial Sector [Member]
Loans with no related allowance recorded:
Recorded Investment	377		377		469
Unpaid Principal Balance	428		428		504
Related Allowance
Average Recorded Investment			429		513
Interest Income Recognized			15		23
Loans with an allowance recorded:
Recorded Investment	95		95
Unpaid Principal Balance	95		95
Related Allowance	95		95
Average Recorded Investment
Interest Income Recognized
Total impaired loans
Recorded Investment	472		472		469
Unpaid Principal Balance	523		523		504
Related Allowance	$ 95		95
Average Recorded Investment			429		513
Interest Income Recognized			$ 15		$ 23