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Loans and ALLL (Past due and current loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 53	$ 0
Nonaccrual	5,319	6,535
Total Past Due and Nonaccrual	6,870	11,405
Current	1,277,515	1,175,165
Total	1,284,385	1,186,570
Total commercial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	53	0
Nonaccrual	1,367	1,621
Total Past Due and Nonaccrual	1,986	2,477
Current	797,646	698,464
Total	799,632	700,941
Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	53	0
Nonaccrual	28	390
Total Past Due and Nonaccrual	178	559
Current	503,862	509,594
Total	504,040	510,153
Commercial other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	1,339	1,231
Total Past Due and Nonaccrual	1,808	1,918
Current	247,017	153,347
Total	248,825	155,265
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
Current	46,767	35,523
Total	46,767	35,523
Total agricultural [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	3,656	4,285
Total Past Due and Nonaccrual	4,455	4,285
Current	98,707	112,635
Total	103,162	116,920
Agricultural real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	3,104	2,711
Total Past Due and Nonaccrual	3,903	2,711
Current	68,476	77,316
Total	72,379	80,027
Agricultural other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	552	1,574
Total Past Due and Nonaccrual	552	1,574
Current	30,231	35,319
Total	30,783	36,893
Total residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Nonaccrual	296	629
Total Past Due and Nonaccrual	384	4,572
Current	307,542	293,997
Total	307,926	298,569
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	184	557
Total Past Due and Nonaccrual	258	4,278
Current	270,436	253,894
Total	270,694	258,172
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	3	65
Current	4,715	5,766
Total	4,718	5,831
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	112	72
Total Past Due and Nonaccrual	123	229
Current	32,391	34,337
Total	32,514	34,566
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	45	71
Current	73,620	70,069
Total	73,665	70,140
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	41	68
Current	70,311	66,547
Total	70,352	66,615
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	4	3
Current	3,309	3,522
Total	3,313	3,525
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,176	4,426
Financial Asset, 30 to 59 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	271	670
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	51	139
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	220	531
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	799	0
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	799	0
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	88	3,685
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	74	3,463
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	3	65
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	11	157
Financial Asset, 30 to 59 Days Past Due [Member] | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	18	71
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	14	68
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	4	3
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	322	444
Financial Asset, 60 to 89 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	295	186
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	46	30
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	249	156
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	258
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	258
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	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]
Financing Receivable, Past Due	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	27	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	27	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 0	$ 0

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