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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 8,146 $ 10,159 $ 8,601 $ 10,064
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 75 143 $ 263 $ 391
Number of Loans | loan     11 12
Pre-Modification Recorded Investment     $ 8,473 $ 7,157
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 8,473 $ 7,157
Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan     7 2
Pre-Modification Recorded Investment     $ 6,901 $ 987
Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan     4 10
Pre-Modification Recorded Investment     $ 1,572 $ 6,170
Commercial other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 3,090 442 1,569 454
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 35 $ 13 $ 71 $ 19
Number of Loans | loan 0 4 5 6
Pre-Modification Recorded Investment $ 0 $ 3,740 $ 4,761 $ 4,702
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 0 $ 3,740 $ 4,761 $ 4,702
Commercial other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 1 1 2
Pre-Modification Recorded Investment $ 0 $ 68 $ 3,189 $ 987
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 3 4 4
Pre-Modification Recorded Investment $ 0 $ 3,672 $ 1,572 $ 3,715
Agricultural other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 1,355 226 1,355
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 18 $ 0 $ 60
Number of Loans | loan     6 4
Pre-Modification Recorded Investment     $ 3,712 $ 2,361
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 3,712 $ 2,361
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 4
Pre-Modification Recorded Investment     $ 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 3,585 4,600 3,908 4,998
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 37 $ 48 $ 115 $ 152
Number of Loans | loan     0 2
Pre-Modification Recorded Investment     $ 0 $ 94
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 0 $ 94
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 $ 94