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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 8,763 $ 10,174 $ 8,828 $ 10,014
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 106 $ 116 $ 188 $ 248
Number of Loans | loan 2 2 11 8
Pre-Modification Recorded Investment $ 109 $ 1,768 $ 8,473 $ 3,417
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 109 $ 1,768 $ 8,473 $ 3,417
Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 0 7 1
Pre-Modification Recorded Investment $ 0 $ 0 $ 6,901 $ 919
Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 2 2 4 7
Pre-Modification Recorded Investment $ 109 $ 1,768 $ 1,572 $ 2,498
Commercial other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,563 460 808 460
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 36 $ 0 $ 36 $ 6
Number of Loans | loan 2 0 5 2
Pre-Modification Recorded Investment $ 109 $ 0 $ 4,761 $ 963
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 109 $ 0 $ 4,761 $ 963
Commercial other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 0 1 1
Pre-Modification Recorded Investment $ 0 $ 0 $ 3,189 $ 919
Commercial other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 2 0 4 1
Pre-Modification Recorded Investment $ 109 $ 0 $ 1,572 $ 44
Agricultural other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 1,355 339 1,355
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 20 $ 0 $ 42
Number of Loans | loan 0 2 6 4
Pre-Modification Recorded Investment $ 0 $ 1,768 $ 3,712 $ 2,361
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 0 $ 1,768 $ 3,712 $ 2,361
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 0 6 0
Pre-Modification Recorded Investment $ 0 $ 0 $ 3,712 $ 0
Agricultural other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 2 0 4
Pre-Modification Recorded Investment $ 0 $ 1,768 $ 0 $ 2,361
Residential real estate senior liens [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 3,912 5,050 4,070 5,197
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 35 $ 49 $ 78 $ 104
Number of Loans | loan     0 2
Pre-Modification Recorded Investment     $ 0 $ 93
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 0 $ 93
Residential real estate senior liens [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan     0 0
Pre-Modification Recorded Investment     $ 0 $ 0
Residential real estate senior liens [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan     0 2
Pre-Modification Recorded Investment     $ 0 $ 93