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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
loan
Mar. 31, 2021
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 6,280 $ 8,894
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 68 $ 82
Number of Loans | loan 1 9
Pre-Modification Recorded Investment $ 98 $ 8,364
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 98 $ 8,364
Interest Rate Below Market Reduction [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 0 7
Pre-Modification Recorded Investment $ 0 $ 6,901
Below Market Interest Rate and Extension of Amortization Period [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 1 2
Pre-Modification Recorded Investment $ 98 $ 1,463
Commercial other [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 2,737 54
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 30 $ 0
Number of Loans | loan 0 3
Pre-Modification Recorded Investment $ 0 $ 4,652
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 0 $ 4,652
Commercial other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Recorded Investment $ 0 $ 3,189
Commercial 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 $ 1,463
Agricultural other [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 678
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0
Number of Loans | loan 0 6
Pre-Modification Recorded Investment $ 0 $ 3,712
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 0 $ 3,712
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 0 6
Pre-Modification Recorded Investment $ 0 $ 3,712
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 0
Pre-Modification Recorded Investment $ 0 $ 0
Residential real estate senior liens [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 3,354 4,228
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 35 $ 43
Number of Loans | loan 1 0
Pre-Modification Recorded Investment $ 98 $ 0
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 98 $ 0
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 1 0
Pre-Modification Recorded Investment $ 98 $ 0