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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 4,528 $ 8,146 $ 5,630 $ 8,601
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 34 75 $ 168 $ 263
Number of Loans | loan     2 11
Pre-Modification Recorded Investment     $ 153 $ 8,473
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 153 $ 8,473
Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan     1 7
Pre-Modification Recorded Investment     $ 55 $ 6,901
Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan     1 4
Pre-Modification Recorded Investment     $ 98 $ 1,572
Commercial other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,413 3,090 2,299 1,569
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 35 $ 62 $ 71
Number of Loans | loan 1 0 1 5
Pre-Modification Recorded Investment $ 55 $ 0 $ 55 $ 4,761
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 55 $ 0 $ 55 $ 4,761
Commercial other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 1 0 1 1
Pre-Modification Recorded Investment $ 55 $ 0 $ 55 $ 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 0 0 4
Pre-Modification Recorded Investment $ 0 $ 0 $ 0 $ 1,572
Agricultural other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment     0 226
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 2,927 3,585 3,141 3,908
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 31 $ 37 $ 97 $ 115
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