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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 8,894 $ 9,857
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 82 $ 132
Number of Loans | loan 9 6
Pre-Modification Recorded Investment $ 8,364 $ 1,649
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 8,364 $ 1,649
Interest Rate Below Market Reduction [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 7 1
Pre-Modification Recorded Investment $ 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 5
Pre-Modification Recorded Investment $ 1,463 $ 730
Commercial other [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 54 460
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 6
Number of Loans | loan 3 2
Pre-Modification Recorded Investment $ 4,652 $ 963
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 4,652 $ 963
Commercial other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 1 1
Pre-Modification Recorded Investment $ 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 1
Pre-Modification Recorded Investment $ 1,463 $ 44
Agricultural other [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 678 1,355
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 22
Number of Loans | loan 6 2
Pre-Modification Recorded Investment $ 3,712 $ 593
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 3,712 $ 593
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 6 0
Pre-Modification Recorded Investment $ 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
Pre-Modification Recorded Investment $ 0 $ 593
Residential real estate senior liens [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 4,228 5,343
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 43 $ 55
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