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Loans (Retail Loan Portfolio Categorized by Performance Status) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Residential Real Estate Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year $ 94,045 $ 79,882
Prior Fiscal Year 1 79,622 86,126
Prior Fiscal Year 2 80,862 119,329
Prior Fiscal Year 3 110,566 77,232
Prior Fiscal Year 4 70,404 56,197
Prior 199,710 171,194
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 635,209 589,960
Residential Real Estate Loans [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 94,045 79,882
Prior Fiscal Year 1 79,520 85,821
Prior Fiscal Year 2 79,578 118,819
Prior Fiscal Year 3 109,822 76,437
Prior Fiscal Year 4 69,564 55,520
Prior 197,688 169,410
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 630,217 585,889
Residential Real Estate Loans [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0 0
Prior Fiscal Year 1 102 305
Prior Fiscal Year 2 1,284 510
Prior Fiscal Year 3 744 795
Prior Fiscal Year 4 840 677
Prior 2,022 1,784
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 4,992 4,071
Residential Real Estate Loans [Member] | Current Period Gross Write-offs [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0  
Prior Fiscal Year 1 0  
Prior Fiscal Year 2 0  
Prior Fiscal Year 3 0  
Prior Fiscal Year 4 32  
Prior 70  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term 0  
Total 102  
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 71,180 70,976
Revolving Loans Converted to Term 5,542 6,694
Total 76,722 77,670
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 71,149 70,942
Revolving Loans Converted to Term 5,372 6,586
Total 76,521 77,528
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 31 34
Revolving Loans Converted to Term 170 108
Total 201 142
Residential Real Estate Lines [Member] | Current Period Gross Write-offs [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0  
Prior Fiscal Year 1 0  
Prior Fiscal Year 2 0  
Prior Fiscal Year 3 0  
Prior Fiscal Year 4 0  
Prior 0  
Revolving Loans Amortized Cost Basis 28  
Revolving Loans Converted to Term 13  
Total 41  
Consumer Indirect [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 201,948 441,080
Prior Fiscal Year 1 362,297 333,111
Prior Fiscal Year 2 256,944 127,096
Prior Fiscal Year 3 89,704 60,362
Prior Fiscal Year 4 37,405 39,557
Prior 33,839 22,414
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 982,137 1,023,620
Consumer Indirect [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 201,305 440,332
Prior Fiscal Year 1 361,192 331,902
Prior Fiscal Year 2 255,880 126,664
Prior Fiscal Year 3 89,404 59,981
Prior Fiscal Year 4 37,256 39,352
Prior 33,718 22,310
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 978,755 1,020,541
Consumer Indirect [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 643 748
Prior Fiscal Year 1 1,105 1,209
Prior Fiscal Year 2 1,064 432
Prior Fiscal Year 3 300 381
Prior Fiscal Year 4 149 205
Prior 121 104
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 3,382 3,079
Consumer Indirect [Member] | Current Period Gross Write-offs [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 342  
Prior Fiscal Year 1 4,331  
Prior Fiscal Year 2 4,254  
Prior Fiscal Year 3 1,343  
Prior Fiscal Year 4 1,018  
Prior 1,189  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term 0  
Total 12,477  
Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 29,304 6,463
Prior Fiscal Year 1 4,453 2,664
Prior Fiscal Year 2 1,680 2,043
Prior Fiscal Year 3 1,171 761
Prior Fiscal Year 4 311 213
Prior 644 308
Revolving Loans Amortized Cost Basis 2,718 2,658
Revolving Loans Converted to Term 0 0
Total 40,281 15,110
Other Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 29,304 6,463
Prior Fiscal Year 1 4,453 2,664
Prior Fiscal Year 2 1,680 2,043
Prior Fiscal Year 3 1,171 761
Prior Fiscal Year 4 311 213
Prior 644 308
Revolving Loans Amortized Cost Basis 2,712 2,656
Revolving Loans Converted to Term 0 0
Total 40,275 15,108
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 0 0
Prior Fiscal Year 3 0 0
Prior Fiscal Year 4 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 6 2
Revolving Loans Converted to Term 0 0
Total 6 $ 2
Other Consumer [Member] | Current Period Gross Write-offs [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 713  
Prior Fiscal Year 1 122  
Prior Fiscal Year 2 105  
Prior Fiscal Year 3 32  
Prior Fiscal Year 4 28  
Prior 19  
Revolving Loans Amortized Cost Basis 45  
Revolving Loans Converted to Term 0  
Total $ 1,064