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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance $ 2,924 $ 6,411
Impaired loans without a valuation allowance, Outstanding Balance 19,094 20,499
Impaired loans, Outstanding Balance 22,018 26,910
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,185 6,683
Impaired loans without a valuation allowance, Unpaid Principal Balance 19,410 20,815
Impaired loans, Unpaid Principal Balance 22,595 27,498
Impaired loans, Valuation Allowance 451 578
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 4,969 8,093
Impaired loans without a valuation allowance, Average Outstanding Balance 17,697 22,289
Impaired loans, Average Outstanding Balance 22,666 30,382
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 200 334
Impaired loans without a valuation allowance, Interest Income Recognized 1,021 1,400
Impaired loans, Interest Income Recognized 1,221 1,734
Total commercial [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 8,342 9,267
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 8,659 9,584
Impaired loans, Valuation Allowance 12 13
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 8,053 11,853
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 470 638
Commercial real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 183 192
Impaired loans without a valuation allowance, Outstanding Balance 5,366 5,829
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 184 193
Impaired loans without a valuation allowance, Unpaid Principal Balance 5,682 6,145
Impaired loans, Valuation Allowance 12 9
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 189 1,668
Impaired loans without a valuation allowance, Average Outstanding Balance 5,514 6,313
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 12 69
Impaired loans without a valuation allowance, Interest Income Recognized 338 398
Commercial other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 2,802
Impaired loans without a valuation allowance, Outstanding Balance 2,793 444
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 2,802
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,793 444
Impaired loans, Valuation Allowance 0 4
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 1,724 1,909
Impaired loans without a valuation allowance, Average Outstanding Balance 626 1,963
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 62 103
Impaired loans without a valuation allowance, Interest Income Recognized 58 68
Total agricultural [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 10,935 14,189
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 10,935 14,189
Impaired loans, Valuation Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 11,552 14,730
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 625 945
Agricultural real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance   0
Impaired loans without a valuation allowance, Outstanding Balance 8,522 9,538
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance   0
Impaired loans without a valuation allowance, Unpaid Principal Balance 8,522 9,538
Impaired loans, Valuation Allowance   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance   553
Impaired loans without a valuation allowance, Average Outstanding Balance 8,568 9,739
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized   11
Impaired loans without a valuation allowance, Interest Income Recognized 468 699
Agricultural other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance   0
Impaired loans without a valuation allowance, Outstanding Balance 2,413 4,651
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance   0
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,413 4,651
Impaired loans, Valuation Allowance   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance   169
Impaired loans without a valuation allowance, Average Outstanding Balance 2,984 4,269
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized   0
Impaired loans without a valuation allowance, Interest Income Recognized 157 235
Total residential real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 2,741 3,454
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 3,001 3,725
Impaired loans, Valuation Allowance 439 565
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 3,061 3,799
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 126 151
Residential real estate senior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 2,741 3,417
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,001 3,688
Impaired loans, Valuation Allowance 439 565
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 3,056 3,794
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 126 151
Residential real estate home equity lines of credit [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Outstanding Balance 0 37
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans without a valuation allowance, Unpaid Principal Balance 0 37
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Average Outstanding Balance 5 5
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0