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Loans and ALLL (Credit quality indicators for commercial and agricultural credit exposures) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 1,271,910	$ 1,301,037
Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	772,567	807,439
Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	562,131	570,587
Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	173,145	164,851
Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	37,291	72,001
Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	94,726	93,955
Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	66,344	66,144
Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	28,382	27,811
Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	867,293	901,394
1 - Excellent [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	300	300
1 - Excellent [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
1 - Excellent [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	300	300
1 - Excellent [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
1 - Excellent [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
1 - Excellent [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
1 - Excellent [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
1 - Excellent [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	300	300
2 - High quality [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	18,471	15,891
2 - High quality [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	9,368	9,010
2 - High quality [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	9,103	6,881
2 - High quality [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
2 - High quality [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	413	453
2 - High quality [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	383	453
2 - High quality [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	30	0
2 - High quality [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	18,884	16,344
3 - High satisfactory [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	148,622	204,223
3 - High satisfactory [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	72,155	86,135
3 - High satisfactory [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	39,176	46,087
3 - High satisfactory [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	37,291	72,001
3 - High satisfactory [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	14,966	13,656
3 - High satisfactory [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	9,420	9,361
3 - High satisfactory [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,546	4,295
3 - High satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	163,588	217,879
4 - Low satisfactory [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	568,721	552,864
4 - Low satisfactory [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	452,567	448,489
4 - Low satisfactory [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	116,154	104,375
4 - Low satisfactory [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
4 - Low satisfactory [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	55,398	52,469
4 - Low satisfactory [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	39,063	36,483
4 - Low satisfactory [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	16,335	15,986
4 - Low satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	624,119	605,333
5 - Special mention [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	22,771	14,563
5 - Special mention [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	18,955	13,212
5 - Special mention [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,816	1,351
5 - Special mention [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
5 - Special mention [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	16,270	16,548
5 - Special mention [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	11,231	13,096
5 - Special mention [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,039	3,452
5 - Special mention [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	39,041	31,111
6 - Substandard [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	13,498	19,257
6 - Substandard [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	9,004	13,519
6 - Substandard [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,494	5,738
6 - Substandard [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
6 - Substandard [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,408	10,055
6 - Substandard [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	6,143	6,252
6 - Substandard [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,265	3,803
6 - Substandard [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	20,906	29,312
7 - Vulnerable [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	184	341
7 - Vulnerable [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	82	222
7 - Vulnerable [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	102	119
7 - Vulnerable [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
7 - Vulnerable [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	271	774
7 - Vulnerable [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	104	499
7 - Vulnerable [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	167	275
7 - Vulnerable [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	455	1,115
8 - Doubtful [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
8 - Doubtful [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
8 - Doubtful [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
8 - Doubtful [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Total commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Commercial other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Total agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Agricultural real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Agricultural other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Loss [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 0	$ 0

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