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Loans (Retail Loan Portfolio Categorized by Performance Status) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Residential Real Estate Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year $ 72,522 $ 137,926
Prior Fiscal Year 1 132,899 104,122
Prior Fiscal Year 2 89,976 87,918
Prior Fiscal Year 3 71,863 67,111
Prior Fiscal Year 4 55,421 67,706
Prior 161,410 135,017
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 584,091 599,800
Residential Real Estate Loans [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 72,522 137,926
Prior Fiscal Year 1 132,594 103,923
Prior Fiscal Year 2 89,736 87,153
Prior Fiscal Year 3 71,263 66,446
Prior Fiscal Year 4 54,733 67,473
Prior 160,786 134,292
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 581,634 597,213
Residential Real Estate Loans [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0 0
Prior Fiscal Year 1 305 199
Prior Fiscal Year 2 240 765
Prior Fiscal Year 3 600 665
Prior Fiscal Year 4 688 233
Prior 624 725
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 2,457 2,587
Residential Real Estate Lines [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0 0
Prior Fiscal Year 1 0 0
Prior Fiscal Year 2 0 0
Prior Fiscal Year 3 0 0
Prior Fiscal Year 4 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 70,959 79,322
Revolving Loans Converted to Term 8,237 10,483
Total 79,196 89,805
Residential Real Estate Lines [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0 0
Prior Fiscal Year 1 0 0
Prior Fiscal Year 2 0 0
Prior Fiscal Year 3 0 0
Prior Fiscal Year 4 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 70,898 79,257
Revolving Loans Converted to Term 8,106 10,225
Total 79,004 89,482
Residential Real Estate Lines [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0 0
Prior Fiscal Year 1 0 0
Prior Fiscal Year 2 0 0
Prior Fiscal Year 3 0 0
Prior Fiscal Year 4 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 61 65
Revolving Loans Converted to Term 131 258
Total 192 323
Consumer Indirect [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 370,907 295,286
Prior Fiscal Year 1 230,874 202,839
Prior Fiscal Year 2 140,540 167,092
Prior Fiscal Year 3 106,879 111,295
Prior Fiscal Year 4 63,514 47,925
Prior 27,823 15,984
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 940,537 840,421
Consumer Indirect [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 370,536 295,216
Prior Fiscal Year 1 230,468 202,187
Prior Fiscal Year 2 139,884 166,773
Prior Fiscal Year 3 106,545 111,008
Prior Fiscal Year 4 63,216 47,793
Prior 27,784 15,949
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 938,433 838,926
Consumer Indirect [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 371 70
Prior Fiscal Year 1 406 652
Prior Fiscal Year 2 656 319
Prior Fiscal Year 3 334 287
Prior Fiscal Year 4 298 132
Prior 39 35
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 2,104 1,495
Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 4,091 6,774
Prior Fiscal Year 1 4,273 3,177
Prior Fiscal Year 2 2,012 1,765
Prior Fiscal Year 3 964 907
Prior Fiscal Year 4 376 369
Prior 812 508
Revolving Loans Amortized Cost Basis 2,806 3,563
Revolving Loans Converted to Term 0 0
Total 15,334 17,063
Other Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 4,091 6,774
Prior Fiscal Year 1 4,273 3,177
Prior Fiscal Year 2 2,010 1,765
Prior Fiscal Year 3 964 907
Prior Fiscal Year 4 376 369
Prior 812 508
Revolving Loans Amortized Cost Basis 2,806 3,563
Revolving Loans Converted to Term 0 0
Total 15,332 17,063
Other Consumer [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0 0
Prior Fiscal Year 1 0 0
Prior Fiscal Year 2 2 0
Prior Fiscal Year 3 0 0
Prior Fiscal Year 4 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total $ 2 $ 0