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Loans and ALLL (Summary of information pertaining to TDRs) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 10,470 $ 13,500 $ 10,523 $ 14,417
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 37 $ 132 $ 252 $ 371
Number of Loans | loan 1 8 6 34
Pre-Modification Recorded Investment $ 25 $ 1,426 $ 2,043 $ 7,671
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 25 $ 1,426 $ 2,043 $ 7,647
Interest Rate Below Market Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 1 6 1 15
Pre-Modification Recorded Investment $ 25 $ 575 $ 25 $ 2,674
Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 0 2 5 19
Pre-Modification Recorded Investment $ 0 $ 851 $ 2,018 $ 4,997
Commercial other [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 11 778 11 1,263
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 16 $ 0 $ 55
Number of Loans | loan     2 4
Pre-Modification Recorded Investment     $ 184 $ 1,360
Financing Receivable, Modifications, Post-Modification Recorded Investment     $ 184 $ 1,360
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     2 3
Pre-Modification Recorded Investment     $ 184 $ 1,186
Agricultural other [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,292 324 659 108
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 11 $ 45 $ 20 $ 45
Number of Loans | loan 1 7 4 22
Pre-Modification Recorded Investment $ 25 $ 1,327 $ 1,859 $ 5,718
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 25 $ 1,327 $ 1,859 $ 5,694
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 1 5 1 12
Pre-Modification Recorded Investment $ 25 $ 476 $ 25 $ 2,345
Agricultural other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 0 2 3 10
Pre-Modification Recorded Investment $ 0 $ 851 $ 1,834 $ 3,373
Residential real estate senior liens [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 6,096 7,512 6,406 7,694
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 14 $ 17 $ 101 $ 107
Number of Loans | loan 0 1 0 8
Pre-Modification Recorded Investment $ 0 $ 99 $ 0 $ 593
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 99 $ 0 $ 593
Residential real estate senior liens [Member] | Interest Rate Below Market Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan 0 1 0 2
Pre-Modification Recorded Investment $ 0 $ 99 $ 0 $ 155
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 0 0 6
Pre-Modification Recorded Investment $ 0 $ 0 $ 0 $ 438
Residential real estate junior liens [Member]        
Financing Receivable, Modifications [Line Items]        
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 12 18 12 29
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0