Loans and ALLL (Past due and current loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 0	$ 97
Nonaccrual	457	1,245
Total Past Due and Nonaccrual	11,130	4,031
Total	1,264,173	1,301,037
Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	96	341
Total Past Due and Nonaccrual	7,504	561
Total	740,920	807,439
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	74	222
Total Past Due and Nonaccrual	7,197	357
Total	574,660	570,587
Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	22	119
Total Past Due and Nonaccrual	307	204
Total	166,260	164,851
Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total	0	72,001
Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	234	774
Total Past Due and Nonaccrual	234	987
Total	104,314	93,955
Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	67	499
Total Past Due and Nonaccrual	67	712
Total	72,331	66,144
Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	167	275
Total Past Due and Nonaccrual	167	275
Total	31,983	27,811
Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	97
Nonaccrual	127	130
Total Past Due and Nonaccrual	3,333	2,287
Total	340,885	326,361
Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	97
Nonaccrual	127	93
Total Past Due and Nonaccrual	3,295	2,243
Total	304,901	293,143
Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total	3,282	2,439
Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	37
Total Past Due and Nonaccrual	38	44
Total	32,702	30,779
Total consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	59	196
Total	78,054	73,282
Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	55	186
Total	74,941	70,445
Consumer unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	4	10
Total	3,113	2,837
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	7,870	2,652
Financing Receivables, 30 to 59 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4,838	220
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4,553	135
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	285	85
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	213
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	213
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,981	2,023
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,943	2,016
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	38	7
Financing Receivables, 30 to 59 Days Past Due [Member] | Total consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	51	196
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	47	186
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4	10
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,803	37
Financing Receivables, 60 to 89 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,570	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,570	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	225	37
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	225	37
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	8	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	8	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Financial Asset, Not Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,253,043	1,297,006
Financial Asset, Not Past Due | Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	733,416	806,878
Financial Asset, Not Past Due | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	567,463	570,230
Financial Asset, Not Past Due | Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	165,953	164,647
Financial Asset, Not Past Due | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	72,001
Financial Asset, Not Past Due | Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	104,080	92,968
Financial Asset, Not Past Due | Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	72,264	65,432
Financial Asset, Not Past Due | Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	31,816	27,536
Financial Asset, Not Past Due | Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	337,552	324,074
Financial Asset, Not Past Due | Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	301,606	290,900
Financial Asset, Not Past Due | Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,282	2,439
Financial Asset, Not Past Due | Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	32,664	30,735
Financial Asset, Not Past Due | Total consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	77,995	73,086
Financial Asset, Not Past Due | Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	74,886	70,259
Financial Asset, Not Past Due | Consumer unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 3,109	$ 2,827