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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
loan
Mar. 31, 2018
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 10,549 $ 14,870
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 123 $ 193
Number of Loans | loan 3 7
Pre-Modification Recorded Investment $ 670 $ 2,483
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 670 $ 2,483
Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 2
Pre-Modification Recorded Investment $ 0 $ 272
Below Market Interest Rate and Extension of Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 5
Pre-Modification Recorded Investment $ 670 $ 2,211
Commercial other [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 12 1,547
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 24
Number of Loans | loan 1 3
Pre-Modification Recorded Investment $ 147 $ 1,255
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 147 $ 1,255
Commercial other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Recorded Investment $ 0 $ 174
Commercial other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 2
Pre-Modification Recorded Investment $ 147 $ 1,081
Agricultural other [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 44 0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0
Number of Loans | loan 2 2
Pre-Modification Recorded Investment $ 523 $ 1,061
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 523 $ 1,061
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Recorded Investment $ 0 $ 98
Agricultural other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 1
Pre-Modification Recorded Investment $ 523 $ 963
Residential real estate senior liens [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 6,682 7,824
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 68 $ 74
Number of Loans | loan 0 2
Pre-Modification Recorded Investment $ 0 $ 167
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 167
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 0 2
Pre-Modification Recorded Investment $ 0 $ 167
Residential real estate junior liens [Member]    
Financing Receivable, Modifications [Line Items]    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 12 40
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0