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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 9,857 $ 10,549
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 132 $ 123
Number of Loans | loan 6 3
Pre-Modification Recorded Investment $ 1,649 $ 670
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,649 $ 670
Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 0
Pre-Modification Recorded Investment $ 919 $ 0
Below Market Interest Rate and Extension of Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 5 3
Pre-Modification Recorded Investment $ 730 $ 670
Commercial other [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 460 12
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 6 $ 0
Number of Loans | loan 2 1
Pre-Modification Recorded Investment $ 963 $ 147
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 963 $ 147
Commercial other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 0
Pre-Modification Recorded Investment $ 919 $ 0
Commercial other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 1
Pre-Modification Recorded Investment $ 44 $ 147
Agricultural other [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,355 44
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 22 $ 0
Number of Loans | loan 2 2
Pre-Modification Recorded Investment $ 593 $ 523
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 593 $ 523
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 0
Pre-Modification Recorded Investment $ 0 $ 0
Agricultural other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 2
Pre-Modification Recorded Investment $ 593 $ 523
Residential real estate senior liens [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 5,343 6,682
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 55 $ 68
Number of Loans | loan 2 0
Pre-Modification Recorded Investment $ 93 $ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 93 $ 0
Residential real estate senior liens [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [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, Modifications [Line Items]    
Number of Loans | loan 2 0
Pre-Modification Recorded Investment $ 93 $ 0
Residential real estate junior liens [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 12
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0