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Loans and ALLL (Past due and current loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Financing Receivable, 90 Days or More Past Due, Still Accruing $ 0 $ 0
Nonaccrual 3,077 5,313
Total Past Due and Nonaccrual 3,498 9,610
Total 1,248,558 1,238,311
Loans and Leases Receivable, Gross 1,248,558 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 161 1,329
Total Past Due and Nonaccrual 345 2,148
Total 757,993 756,686
Loans and Leases Receivable, Gross 757,993 756,686
Commercial real estate [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, 90 Days or More Past Due, Still Accruing 0 0
Nonaccrual 37 26
Total Past Due and Nonaccrual 80 359
Total 537,016 506,297
Loans and Leases Receivable, Gross 537,016 506,297
Commercial other [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, 90 Days or More Past Due, Still Accruing 0 0
Nonaccrual 124 1,303
Total Past Due and Nonaccrual 265 1,789
Total 174,000 200,131
Loans and Leases Receivable, Gross 174,000 200,131
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 46,977 50,258
Loans and Leases Receivable, Gross 46,977 50,258
Total agricultural [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, 90 Days or More Past Due, Still Accruing 0 0
Nonaccrual 2,811 3,785
Total Past Due and Nonaccrual 2,860 3,786
Total 93,782 100,461
Loans and Leases Receivable, Gross 93,782 100,461
Agricultural real estate [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, 90 Days or More Past Due, Still Accruing 0 0
Nonaccrual 2,536 3,398
Total Past Due and Nonaccrual 2,585 3,398
Total 66,109 71,218
Loans and Leases Receivable, Gross 66,109 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 27,673 29,243
Loans and Leases Receivable, Gross 27,673 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 105 199
Total Past Due and Nonaccrual 268 3,580
Total 321,620 307,543
Loans and Leases Receivable, Gross 321,620 307,543
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 105 199
Total Past Due and Nonaccrual 261 3,547
Loans and Leases Receivable, Gross 287,213 272,972
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 2,837 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 7 8
Loans and Leases Receivable, Gross 31,570 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 25 96
Total 75,163 73,621
Loans and Leases Receivable, Gross 75,163 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 17 93
Loans and Leases Receivable, Gross 72,285 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 8 3
Loans and Leases Receivable, Gross 2,878 3,179
Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Total 372 4,152
Financial Asset, 30 to 59 Days Past Due [Member] | Total commercial [Member]    
Financing Receivable, Past Due [Line Items]    
Total 184 819
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]    
Financing Receivable, Past Due [Line Items]    
Total 43 333
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial other [Member]    
Financing Receivable, Past Due [Line Items]    
Total 141 486
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 163 3,236
Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate senior liens [Member]    
Financing Receivable, Past Due [Line Items]    
Total 156 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 7 8
Financial Asset, 30 to 59 Days Past Due [Member] | Total Consumer [Member]    
Financing Receivable, Past Due [Line Items]    
Total 25 96
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer secured [Member]    
Financing Receivable, Past Due [Line Items]    
Total 17 93
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Unsecured Financing Receivable [Member]    
Financing Receivable, Past Due [Line Items]    
Total 8 3
Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Total 49 145
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 49 0
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural real estate [Member]    
Financing Receivable, Past Due [Line Items]    
Total 49 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 0 145
Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate senior liens [Member]    
Financing Receivable, Past Due [Line Items]    
Total 0 145
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 0 0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer secured [Member]    
Financing Receivable, Past Due [Line Items]    
Total 0 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 1,245,060 1,228,701
Financial Asset, Not Past Due | Total commercial [Member]    
Financing Receivable, Past Due [Line Items]    
Total 757,648 754,538
Financial Asset, Not Past Due | Commercial real estate [Member]    
Financing Receivable, Past Due [Line Items]    
Total 536,936 505,938
Financial Asset, Not Past Due | Commercial other [Member]    
Financing Receivable, Past Due [Line Items]    
Total 173,735 198,342
Financial Asset, Not Past Due | Commercial Advances to Mortgage Brokers Segment [Member]    
Financing Receivable, Past Due [Line Items]    
Total 46,977 50,258
Financial Asset, Not Past Due | Total agricultural [Member]    
Financing Receivable, Past Due [Line Items]    
Total 90,922 96,675
Financial Asset, Not Past Due | Agricultural real estate [Member]    
Financing Receivable, Past Due [Line Items]    
Total 63,524 67,820
Financial Asset, Not Past Due | Agricultural other [Member]    
Financing Receivable, Past Due [Line Items]    
Total 27,398 28,855
Financial Asset, Not Past Due | Total residential real estate [Member]    
Financing Receivable, Past Due [Line Items]    
Total 321,352 303,963
Financial Asset, Not Past Due | Residential real estate senior liens [Member]    
Financing Receivable, Past Due [Line Items]    
Total 286,952 269,425
Financial Asset, Not Past Due | Residential real estate junior liens [Member]    
Financing Receivable, Past Due [Line Items]    
Total 2,837 3,791
Financial Asset, Not Past Due | Residential real estate home equity lines of credit [Member]    
Financing Receivable, Past Due [Line Items]    
Total 31,563 30,747
Financial Asset, Not Past Due | Total Consumer [Member]    
Financing Receivable, Past Due [Line Items]    
Total 75,138 73,525
Financial Asset, Not Past Due | Consumer secured [Member]    
Financing Receivable, Past Due [Line Items]    
Total 72,268 70,349
Financial Asset, Not Past Due | Consumer Unsecured Financing Receivable [Member]    
Financing Receivable, Past Due [Line Items]    
Total $ 2,870 $ 3,176