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Loans (Retail Loan Portfolio Categorized by Performance Status) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Residential Real Estate Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year $ 112,704 $ 79,882
Prior Fiscal Year 1 80,501 86,126
Prior Fiscal Year 2 81,513 119,329
Prior Fiscal Year 3 110,955 77,232
Prior Fiscal Year 4 71,462 56,197
Prior 192,687 171,194
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 649,822 589,960
Residential Real Estate Loans [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 112,704 79,882
Prior Fiscal Year 1 80,117 85,821
Prior Fiscal Year 2 80,323 118,819
Prior Fiscal Year 3 109,601 76,437
Prior Fiscal Year 4 70,325 55,520
Prior 190,388 169,410
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 643,458 585,889
Residential Real Estate Loans [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 0 0
Prior Fiscal Year 1 384 305
Prior Fiscal Year 2 1,190 510
Prior Fiscal Year 3 1,354 795
Prior Fiscal Year 4 1,137 677
Prior 2,299 1,784
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 6,364 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 95  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term 0  
Total 127  
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 72,183 70,976
Revolving Loans Converted to Term 5,184 6,694
Total 77,367 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 72,128 70,942
Revolving Loans Converted to Term 5,018 6,586
Total 77,146 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 55 34
Revolving Loans Converted to Term 166 108
Total 221 142
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 247,918 441,080
Prior Fiscal Year 1 337,452 333,111
Prior Fiscal Year 2 234,164 127,096
Prior Fiscal Year 3 79,032 60,362
Prior Fiscal Year 4 31,315 39,557
Prior 18,950 22,414
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 948,831 1,023,620
Consumer Indirect [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 247,194 440,332
Prior Fiscal Year 1 336,369 331,902
Prior Fiscal Year 2 232,891 126,664
Prior Fiscal Year 3 78,652 59,981
Prior Fiscal Year 4 31,091 39,352
Prior 18,820 22,310
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 945,017 1,020,541
Consumer Indirect [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 724 748
Prior Fiscal Year 1 1,083 1,209
Prior Fiscal Year 2 1,273 432
Prior Fiscal Year 3 380 381
Prior Fiscal Year 4 224 205
Prior 130 104
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 3,814 3,079
Consumer Indirect [Member] | Current Period Gross Write-offs [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 1,371  
Prior Fiscal Year 1 6,279  
Prior Fiscal Year 2 5,845  
Prior Fiscal Year 3 1,787  
Prior Fiscal Year 4 1,282  
Prior 1,459  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Converted to Term 0  
Total 18,023  
Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 35,496 6,463
Prior Fiscal Year 1 3,990 2,664
Prior Fiscal Year 2 1,424 2,043
Prior Fiscal Year 3 949 761
Prior Fiscal Year 4 217 213
Prior 256 308
Revolving Loans Amortized Cost Basis 2,768 2,658
Revolving Loans Converted to Term 0 0
Total 45,100 15,110
Other Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 35,483 6,463
Prior Fiscal Year 1 3,990 2,664
Prior Fiscal Year 2 1,424 2,043
Prior Fiscal Year 3 949 761
Prior Fiscal Year 4 217 213
Prior 256 308
Revolving Loans Amortized Cost Basis 2,747 2,656
Revolving Loans Converted to Term 0 0
Total 45,066 15,108
Other Consumer [Member] | Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 13 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 21 2
Revolving Loans Converted to Term 0 0
Total 34 $ 2
Other Consumer [Member] | Current Period Gross Write-offs [Member]    
Financing Receivable Recorded Investment [Line Items]    
Current Fiscal Year 902  
Prior Fiscal Year 1 127  
Prior Fiscal Year 2 105  
Prior Fiscal Year 3 52  
Prior Fiscal Year 4 31  
Prior 20  
Revolving Loans Amortized Cost Basis 47  
Revolving Loans Converted to Term 0  
Total $ 1,284