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Loans and ALLL (Past due and current loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 0
Nonaccrual	3,329	5,313
Total Past Due and Nonaccrual	3,913	9,610
Total	1,206,663	1,238,311
Loans and Leases Receivable, Gross	1,206,663	1,238,311
Total commercial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	182	1,329
Total Past Due and Nonaccrual	513	2,148
Total	723,888	756,686
Loans and Leases Receivable, Gross	723,888	756,686
Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	45	26
Total Past Due and Nonaccrual	101	359
Total	520,206	506,297
Loans and Leases Receivable, Gross	520,206	506,297
Commercial other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	137	1,303
Total Past Due and Nonaccrual	412	1,789
Total	203,682	200,131
Loans and Leases Receivable, Gross	203,682	200,131
Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total	0	50,258
Loans and Leases Receivable, Gross	0	50,258
Total agricultural [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	3,014	3,785
Total Past Due and Nonaccrual	3,014	3,786
Total	95,197	100,461
Loans and Leases Receivable, Gross	95,197	100,461
Agricultural real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	2,739	3,398
Total Past Due and Nonaccrual	2,739	3,398
Total	68,508	71,218
Loans and Leases Receivable, Gross	68,508	71,218
Agricultural other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	275	387
Total Past Due and Nonaccrual	275	388
Total	26,689	29,243
Loans and Leases Receivable, Gross	26,689	29,243
Total residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	133	199
Total Past Due and Nonaccrual	277	3,580
Total	312,567	307,543
Loans and Leases Receivable, Gross	312,567	307,543
Residential real estate senior liens [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	133	199
Total Past Due and Nonaccrual	277	3,547
Loans and Leases Receivable, Gross	279,339	272,972
Residential real estate junior liens [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	25
Loans and Leases Receivable, Gross	3,179	3,816
Residential real estate home equity lines of credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	8
Loans and Leases Receivable, Gross	30,049	30,755
Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	109	96
Total	75,011	73,621
Loans and Leases Receivable, Gross	75,011	73,621
Consumer secured [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	102	93
Loans and Leases Receivable, Gross	72,078	70,442
Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	7	3
Loans and Leases Receivable, Gross	2,933	3,179
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	418	4,152
Financial Asset, 30 to 59 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Past Due [Line Items]
Total	331	819
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	56	333
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Past Due [Line Items]
Total	275	486
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Past Due [Line Items]
Total	0	1
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Past Due [Line Items]
Total	0	1
Financial Asset, 30 to 59 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	9	3,236
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Past Due [Line Items]
Total	9	3,203
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Past Due [Line Items]
Total	0	25
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Past Due [Line Items]
Total	0	8
Financial Asset, 30 to 59 Days Past Due [Member] | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total	78	96
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Past Due [Line Items]
Total	71	93
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Total	7	3
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total	166	145
Financial Asset, 60 to 89 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	135	145
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Past Due [Line Items]
Total	135	145
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total	31	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Past Due [Line Items]
Total	31	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Total	0	0
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	1,202,750	1,228,701
Financial Asset, Not Past Due | Total commercial [Member]
Financing Receivable, Past Due [Line Items]
Total	723,375	754,538
Financial Asset, Not Past Due | Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	520,105	505,938
Financial Asset, Not Past Due | Commercial other [Member]
Financing Receivable, Past Due [Line Items]
Total	203,270	198,342
Financial Asset, Not Past Due | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Past Due [Line Items]
Total	0	50,258
Financial Asset, Not Past Due | Total agricultural [Member]
Financing Receivable, Past Due [Line Items]
Total	92,183	96,675
Financial Asset, Not Past Due | Agricultural real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	65,769	67,820
Financial Asset, Not Past Due | Agricultural other [Member]
Financing Receivable, Past Due [Line Items]
Total	26,414	28,855
Financial Asset, Not Past Due | Total residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Total	312,290	303,963
Financial Asset, Not Past Due | Residential real estate senior liens [Member]
Financing Receivable, Past Due [Line Items]
Total	279,062	269,425
Financial Asset, Not Past Due | Residential real estate junior liens [Member]
Financing Receivable, Past Due [Line Items]
Total	3,179	3,791
Financial Asset, Not Past Due | Residential real estate home equity lines of credit [Member]
Financing Receivable, Past Due [Line Items]
Total	30,049	30,747
Financial Asset, Not Past Due | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total	74,902	73,525
Financial Asset, Not Past Due | Consumer secured [Member]
Financing Receivable, Past Due [Line Items]
Total	71,976	70,349
Financial Asset, Not Past Due | Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Total	$ 2,926	$ 3,176

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Amount of financing receivable 90 days or more past due and still accruing.

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