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Loans & Leases and Allowance for Credit Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
With no related allowance recorded [Abstract]      
Recorded Investment $ 1,623 $ 4,573 $ 4,963
Unpaid Principal Balance 1,691 4,686 5,016
Average Recorded Investment 3,294 4,552 4,705
Interest Income Recognized 4 40 158
With an allowance recorded [Abstract]      
Recorded Investment 5,824 2,530 2,592
Unpaid Principal Balance 5,855 2,746 2,844
Related Allowance 1,100 945 768
Average Recorded Investment 4,209 2,558 2,588
Interest Income Recognized 60 16 47
Total [Abstract]      
Recorded Investment 7,447 7,103 7,555
Unpaid Principal Balance 7,546 7,432 7,860
Related Allowance 1,100 945 768
Average Recorded Investment 7,503 7,110 7,293
Interest Income Recognized 64 56 205
Commercial Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 110 80 184
Unpaid Principal Balance 110 80 184
Average Recorded Investment 147 91 354
Interest Income Recognized 4 2 7
With an allowance recorded [Abstract]      
Recorded Investment 3,024    
Unpaid Principal Balance 3,010    
Related Allowance 471    
Average Recorded Investment 1,512    
Interest Income Recognized 30    
Total [Abstract]      
Related Allowance 471    
Agricultural Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 976    
Unpaid Principal Balance 983    
Average Recorded Investment 1,141    
Interest Income Recognized 0    
Residential 1st Mortgages [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 413 329 451
Unpaid Principal Balance 467 371 504
Average Recorded Investment 432 440 404
Interest Income Recognized 0 2 10
With an allowance recorded [Abstract]      
Recorded Investment 426 242 430
Unpaid Principal Balance 466 282 469
Related Allowance 20 12 21
Average Recorded Investment 428 295 336
Interest Income Recognized 5 3 13
Total [Abstract]      
Related Allowance 20 12 21
Home Equity Lines & Loans [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 64 725 0
Unpaid Principal Balance 65 796 0
Average Recorded Investment 32 653 181
Interest Income Recognized 0 0 0
With an allowance recorded [Abstract]      
Recorded Investment 89 218 90
Unpaid Principal Balance 95 231 97
Related Allowance 4 35 5
Average Recorded Investment 90 176 123
Interest Income Recognized 1 1 4
Total [Abstract]      
Related Allowance 4 35 5
Agricultural [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 60 193 0
Unpaid Principal Balance 66 193 0
Average Recorded Investment 30 193 144
Interest Income Recognized 0 0 5
With an allowance recorded [Abstract]      
Recorded Investment 638 413 625
Unpaid Principal Balance 639 413 625
Related Allowance 331 115 128
Average Recorded Investment 632 413 581
Interest Income Recognized 8 6 22
Total [Abstract]      
Related Allowance 331 115 128
Commercial [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 0 3,083 3,023
Unpaid Principal Balance 0 3,083 3,023
Average Recorded Investment 1,512 3,093 3,053
Interest Income Recognized 0 33 133
With an allowance recorded [Abstract]      
Recorded Investment 1,641 1,631 1,441
Unpaid Principal Balance 1,633 1,789 1,640
Related Allowance 268 757 608
Average Recorded Investment 1,541 1,644 1,536
Interest Income Recognized 16 6 8
Total [Abstract]      
Related Allowance 268 757 608
Consumer & Other [Member]      
With an allowance recorded [Abstract]      
Recorded Investment 6 26 6
Unpaid Principal Balance 12 31 13
Related Allowance 6 26 6
Average Recorded Investment 6 30 12
Interest Income Recognized 0 0 0
Total [Abstract]      
Related Allowance $ 6 $ 26 $ 6