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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 10,551 $ 14,885 $ 10,550 $ 14,877
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 92 $ 46 $ 215 $ 239
Number of Loans | loan 2 19 5 26
Pre-Modification Recorded Investment $ 1,348 $ 3,762 $ 2,018 $ 6,244
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,348 $ 3,738 $ 2,018 $ 6,221
Interest Rate Below Market Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 0 7 0 9
Pre-Modification Recorded Investment $ 0 $ 1,826 $ 0 $ 2,098
Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 2 12 5 17
Pre-Modification Recorded Investment $ 1,348 $ 1,936 $ 2,018 $ 4,146
Commercial other [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 11 1,463 11 1,505
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 15 $ 0 $ 39
Number of Loans | loan 1 1 2 4
Pre-Modification Recorded Investment $ 37 $ 105 $ 184 $ 1,360
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 37 $ 105 $ 184 $ 1,360
Commercial other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 0 0 0 1
Pre-Modification Recorded Investment $ 0 $ 0 $ 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 1 2 3
Pre-Modification Recorded Investment $ 37 $ 105 $ 184 $ 1,186
Agricultural other [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 641 0 343 0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 9 $ 0 $ 9 $ 0
Number of Loans | loan 1 13 3 15
Pre-Modification Recorded Investment $ 1,311 $ 3,330 $ 1,834 $ 4,391
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,311 $ 3,306 $ 1,834 $ 4,368
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 0 6 0 7
Pre-Modification Recorded Investment $ 0 $ 1,770 $ 0 $ 1,868
Agricultural other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 1 7 3 8
Pre-Modification Recorded Investment $ 1,311 $ 1,560 $ 1,834 $ 2,523
Residential real estate senior liens [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 6,439 7,747 6,561 7,785
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 19 $ 16 $ 87 $ 90
Number of Loans | loan 0 5 0 7
Pre-Modification Recorded Investment $ 0 $ 327 $ 0 $ 493
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 327 $ 0 $ 493
Residential real estate senior liens [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 0 1 0 1
Pre-Modification Recorded Investment $ 0 $ 56 $ 0 $ 56
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 4 0 6
Pre-Modification Recorded Investment $ 0 $ 271 $ 0 $ 437
Residential real estate junior liens [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 12 30 12 35
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0