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Loans & Leases and Allowance for Credit Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
With no related allowance recorded [Abstract]          
Recorded Investment $ 505 $ 5,043 $ 505 $ 5,043 $ 4,963
Unpaid Principal Balance 563 5,093 563 5,093 5,016
Average Recorded Investment 1,028 4,642 1,969 4,535 4,705
Interest Income Recognized 5 40 15 121 158
With an allowance recorded [Abstract]          
Recorded Investment 5,724 2,635 5,724 2,635 2,592
Unpaid Principal Balance 5,771 2,870 5,771 2,870 2,844
Related Allowance 721 790 721 790 768
Average Recorded Investment 5,748 2,616 5,251 2,578 2,588
Interest Income Recognized 49 10 159 38 47
Total [Abstract]          
Recorded Investment 6,229 7,678 6,229 7,678 7,555
Unpaid Principal Balance 6,334 7,963 6,334 7,963 7,860
Related Allowance 721 790 721 790 768
Average Recorded Investment 6,776 7,258 7,220 7,113 7,293
Interest Income Recognized 54 50 174 159 205
Commercial Real Estate [Member]          
With no related allowance recorded [Abstract]          
Recorded Investment 106 1,074 106 1,074 184
Unpaid Principal Balance 107 1,071 107 1,071 184
Average Recorded Investment 107 575 121 248 354
Interest Income Recognized 2 2 9 6 7
With an allowance recorded [Abstract]          
Recorded Investment 2,991   2,991    
Unpaid Principal Balance 2,977   2,977    
Related Allowance 384   384    
Average Recorded Investment 3,000   2,509    
Interest Income Recognized 25   80    
Total [Abstract]          
Related Allowance 384   384    
Agricultural Real Estate [Member]          
With no related allowance recorded [Abstract]          
Recorded Investment 0 322 0 322  
Unpaid Principal Balance 0 322 0 322  
Average Recorded Investment 488 404 868 270  
Interest Income Recognized 0 0 0 3  
Residential 1st Mortgages [Member]          
With no related allowance recorded [Abstract]          
Recorded Investment 399 414 399 414 451
Unpaid Principal Balance 456 466 456 466 504
Average Recorded Investment 403 417 415 411 404
Interest Income Recognized 3 3 6 7 10
With an allowance recorded [Abstract]          
Recorded Investment 519 430 519 430 430
Unpaid Principal Balance 574 471 574 471 469
Related Allowance 26 21 26 21 21
Average Recorded Investment 472 335 442 290 336
Interest Income Recognized 3 3 12 9 13
Total [Abstract]          
Related Allowance 26 21 26 21 21
Home Equity Lines & Loans [Member]          
With no related allowance recorded [Abstract]          
Recorded Investment 0 0 0 0 0
Unpaid Principal Balance 0 0 0 0 0
Average Recorded Investment 0 0 21 339 181
Interest Income Recognized 0 0 0 0 0
With an allowance recorded [Abstract]          
Recorded Investment 83 92 83 92 90
Unpaid Principal Balance 90 98 90 98 97
Related Allowance 4 5 4 5 5
Average Recorded Investment 67 93 76 142 123
Interest Income Recognized 0 1 2 3 4
Total [Abstract]          
Related Allowance 4 5 4 5 5
Agricultural [Member]          
With no related allowance recorded [Abstract]          
Recorded Investment 0 191 0 191 0
Unpaid Principal Balance 0 191 0 191 0
Average Recorded Investment 30 192 40 193 144
Interest Income Recognized 0 2 0 5 5
With an allowance recorded [Abstract]          
Recorded Investment 367 640 367 640 625
Unpaid Principal Balance 367 640 367 640 625
Related Allowance 69 137 69 137 128
Average Recorded Investment 499 644 588 529 581
Interest Income Recognized 7 6 21 18 22
Total [Abstract]          
Related Allowance 69 137 69 137 128
Commercial [Member]          
With no related allowance recorded [Abstract]          
Recorded Investment 0 3,042 0 3,042 3,023
Unpaid Principal Balance 0 3,043 0 3,043 3,023
Average Recorded Investment 0 3,053 504 3,073 3,053
Interest Income Recognized 0 33 0 100 133
With an allowance recorded [Abstract]          
Recorded Investment 1,760 1,466 1,760 1,466 1,441
Unpaid Principal Balance 1,752 1,648 1,752 1,648 1,640
Related Allowance 234 620 234 620 608
Average Recorded Investment 1,696 1,536 1,624 1,599 1,536
Interest Income Recognized 14 0 44 8 8
Total [Abstract]          
Related Allowance 234 620 234 620 608
Consumer & Other [Member]          
With no related allowance recorded [Abstract]          
Recorded Investment   0   0  
Unpaid Principal Balance   0   0  
Average Recorded Investment   1   1  
Interest Income Recognized   0   0  
With an allowance recorded [Abstract]          
Recorded Investment 4 7 4 7 6
Unpaid Principal Balance 11 13 11 13 13
Related Allowance 4 7 4 7 6
Average Recorded Investment 14 8 12 18 12
Interest Income Recognized 0 0 0 0 0
Total [Abstract]          
Related Allowance $ 4 $ 7 $ 4 $ 7 $ 6