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Loans - Residential, Home Equity and Consumer Loans Based on Payment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 4,069,355   $ 4,069,355   $ 3,977,900
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Total 619 $ 650 2,279 $ 2,737  
Consumer Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 33,505   33,505   49,282
Year two 26,840   26,840   21,480
Year three 11,071   11,071   9,720
Year four 6,223   6,223   2,756
Year five 1,417   1,417   917
Prior 1,780   1,780   1,912
Revolving Loans Amortized Cost Basis 2,046   2,046   1,786
Total 82,882   82,882   87,853
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     902   1,162
Year two     125   42
Year three     48   23
Year four     37   71
Year five     0   3
Prior     2   1
Revolving Loans Amortized Cost Basis     3   7
Total 364 352 1,117 980 1,309
Consumer Loans | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 33,504   33,504   49,208
Year two 26,797   26,797   21,459
Year three 10,794   10,794   9,708
Year four 6,217   6,217   2,756
Year five 1,417   1,417   917
Prior 1,779   1,779   1,911
Revolving Loans Amortized Cost Basis 2,046   2,046   1,783
Total 82,554   82,554   87,742
Consumer Loans | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1   1   74
Year two 43   43   21
Year three 277   277   12
Year four 6   6   0
Year five 0   0   0
Prior 1   1   1
Revolving Loans Amortized Cost Basis 0   0   3
Total 328   328   111
Home Equity Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 55   55   0
Year two 264   264   417
Year three 4,045   4,045   488
Year four 663   663   150
Year five 424   424   165
Prior 3,905   3,905   1,309
Revolving Loans Amortized Cost Basis 324,473   324,473   297,156
Total 333,829   333,829   299,685
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     0   0
Year three     35   0
Year four     99   55
Year five     0   0
Prior     0   24
Revolving Loans Amortized Cost Basis     0   15
Total 0 0 134 39 94
Home Equity Loans | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 55   55   0
Year two 264   264   170
Year three 3,595   3,595   236
Year four 639   639   90
Year five 424   424   165
Prior 3,623   3,623   1,207
Revolving Loans Amortized Cost Basis 324,435   324,435   296,784
Total 333,035   333,035   298,652
Home Equity Loans | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   247
Year three 450   450   252
Year four 24   24   60
Year five 0   0   0
Prior 282   282   102
Revolving Loans Amortized Cost Basis 38   38   372
Total 794   794   1,033
Residential Mortgage Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 40,889   40,889   56,317
Year two 53,083   53,083   65,361
Year three 59,684   59,684   86,170
Year four 76,003   76,003   41,639
Year five 37,405   37,405   17,940
Prior 95,351   95,351   95,417
Revolving Loans Amortized Cost Basis 0   0   0
Total 362,415   362,415   362,844
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     0   0
Year three     0   22
Year four     0   36
Year five     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Total 0 $ 1 0 $ 58 58
Residential Mortgage Loans | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 40,889   40,889   56,306
Year two 52,945   52,945   65,301
Year three 59,530   59,530   85,753
Year four 75,581   75,581   41,352
Year five 37,019   37,019   17,831
Prior 94,433   94,433   94,926
Revolving Loans Amortized Cost Basis 0   0   0
Total 360,397   360,397   361,469
Residential Mortgage Loans | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   11
Year two 138   138   60
Year three 154   154   417
Year four 422   422   287
Year five 386   386   109
Prior 918   918   491
Revolving Loans Amortized Cost Basis 0   0   0
Total $ 2,018   $ 2,018   $ 1,375