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Loans & Leases and Allowance for Credit Losses, Impaired Loans & Lease (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
With no related allowance recorded [Abstract]      
Recorded Investment $ 1,005 $ 1,623 $ 1,015
Unpaid Principal Balance 1,107 1,691 1,116
Average Recorded Investment 1,010 3,294 1,173
Interest Income Recognized 10 4 22
With an allowance recorded [Abstract]      
Recorded Investment 5,344 5,824 5,303
Unpaid Principal Balance 5,401 5,855 5,364
Related Allowance 581 1,100 623
Average Recorded Investment 5,325 4,209 5,655
Interest Income Recognized 47 60 203
Total [Abstract]      
Recorded Investment 6,349 7,447 6,318
Unpaid Principal Balance 6,508 7,546 6,480
Related Allowance 581 1,100 623
Average Recorded Investment 6,335 7,503 6,828
Interest Income Recognized 57 64 225
Commercial Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 102 110 104
Unpaid Principal Balance 102 110 104
Average Recorded Investment 103 147 107
Interest Income Recognized 2 4 11
With an allowance recorded [Abstract]      
Recorded Investment 2,955 3,024 2,973
Unpaid Principal Balance 2,943 3,010 2,961
Related Allowance 335 471 366
Average Recorded Investment 2,964 1,512 2,999
Interest Income Recognized 24 30 104
Total [Abstract]      
Related Allowance 335 471 366
Agricultural Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment   976 0
Unpaid Principal Balance   983 0
Average Recorded Investment   1,141 488
Interest Income Recognized   0 0
Residential 1st Mortgages [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 903 413 911
Unpaid Principal Balance 1,005 467 1,012
Average Recorded Investment 907 432 532
Interest Income Recognized 8 0 11
With an allowance recorded [Abstract]      
Recorded Investment 583 426 508
Unpaid Principal Balance 649 466 571
Related Allowance 29 20 25
Average Recorded Investment 546 428 469
Interest Income Recognized 7 5 16
Total [Abstract]      
Related Allowance 29 20 25
Home Equity Lines & Loans [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment   64 0
Unpaid Principal Balance   65 0
Average Recorded Investment   32 16
Interest Income Recognized   0 0
With an allowance recorded [Abstract]      
Recorded Investment 78 89 73
Unpaid Principal Balance 88 95 89
Related Allowance 4 4 4
Average Recorded Investment 76 90 74
Interest Income Recognized 1 1 3
Total [Abstract]      
Related Allowance 4 4 4
Agricultural [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment   60 0
Unpaid Principal Balance   66 0
Average Recorded Investment   30 30
Interest Income Recognized   0 0
With an allowance recorded [Abstract]      
Recorded Investment   638 0
Unpaid Principal Balance   639 0
Related Allowance   331 0
Average Recorded Investment   632 409
Interest Income Recognized   8 21
Total [Abstract]      
Related Allowance   331 0
Commercial [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment   0  
Unpaid Principal Balance   0  
Average Recorded Investment   1,512  
Interest Income Recognized   0  
With an allowance recorded [Abstract]      
Recorded Investment 1,720 1,641 1,741
Unpaid Principal Balance 1,713 1,633 1,734
Related Allowance 205 268 220
Average Recorded Investment 1,731 1,541 1,693
Interest Income Recognized 15 16 59
Total [Abstract]      
Related Allowance 205 268 220
Consumer & Other [Member]      
With an allowance recorded [Abstract]      
Recorded Investment 8 6 8
Unpaid Principal Balance 8 12 9
Related Allowance 8 6 8
Average Recorded Investment 8 6 11
Interest Income Recognized 0 0 0
Total [Abstract]      
Related Allowance $ 8 $ 6 $ 8