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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 10,159 $ 10,470 $ 10,064 $ 10,523
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 143 $ 37 $ 391 $ 252
Number of Loans | loan 4 1 12 6
Pre-Modification Recorded Investment $ 3,740 $ 25 $ 7,157 $ 2,043
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 3,740 $ 25 $ 7,157 $ 2,043
Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 1 1 2 1
Pre-Modification Recorded Investment $ 68 $ 25 $ 987 $ 25
Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 3 0 10 5
Pre-Modification Recorded Investment $ 3,672 $ 0 $ 6,170 $ 2,018
Commercial other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 442 11 454 11
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 13 $ 0 $ 19 $ 0
Number of Loans | loan 4 0 6 2
Pre-Modification Recorded Investment $ 3,740 $ 0 $ 4,702 $ 184
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 3,740 $ 0 $ 4,702 $ 184
Commercial other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 1 0 2 0
Pre-Modification Recorded Investment $ 68 $ 0 $ 987 $ 0
Commercial other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 3 0 4 2
Pre-Modification Recorded Investment $ 3,672 $ 0 $ 3,715 $ 184
Agricultural other [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,355 1,292 1,355 659
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 18 $ 11 $ 60 $ 20
Number of Loans | loan 0 1 4 4
Pre-Modification Recorded Investment $ 0 $ 25 $ 2,361 $ 1,859
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 0 $ 25 $ 2,361 $ 1,859
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 1 0 1
Pre-Modification Recorded Investment $ 0 $ 25 $ 0 $ 25
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 4 3
Pre-Modification Recorded Investment $ 0 $ 0 $ 2,361 $ 1,834
Residential real estate senior liens [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 4,600 6,096 4,998 6,406
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 48 14 $ 152 $ 101
Number of Loans | loan     2 0
Pre-Modification Recorded Investment     $ 94 $ 0
Financing Receivable, Troubled Debt Restructuring, Postmodification     $ 94 $ 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     2 0
Pre-Modification Recorded Investment     $ 94 $ 0
Residential real estate junior liens [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 12 0 12
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0