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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 5,787,622   $ 5,787,622   $ 4,133,267
Current Period Gross Charge-Offs          
Total 1,126 $ 619 2,772 $ 2,279  
Consumer Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 43,567   43,567   40,530
Year two 41,681   41,681   20,829
Year three 15,304   15,304   9,372
Year four 5,949   5,949   5,484
Year five 4,060   4,060   1,181
Prior 2,902   2,902   1,550
Revolving Loans Amortized Cost Basis 6,179   6,179   2,450
Total 119,642   119,642   81,396
Current Period Gross Charge-Offs          
Year one     960   1,212
Year two     32   181
Year three     65   72
Year four     30   40
Year five     15   0
Prior     3   2
Revolving Loans Amortized Cost Basis     0   4
Total 446 364 1,105 1,117 1,511
Consumer Loans | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 43,566   43,566   40,504
Year two 41,669   41,669   20,828
Year three 15,304   15,304   9,359
Year four 5,905   5,905   5,469
Year five 4,060   4,060   1,181
Prior 2,902   2,902   1,542
Revolving Loans Amortized Cost Basis 6,179   6,179   2,450
Total 119,585   119,585   81,333
Consumer Loans | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1   1   26
Year two 12   12   1
Year three 0   0   13
Year four 44   44   15
Year five 0   0   0
Prior 0   0   8
Revolving Loans Amortized Cost Basis 0   0   0
Total 57   57   63
Home Equity Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 360   360   172
Year two 1,062   1,062   289
Year three 1,631   1,631   3,998
Year four 4,455   4,455   797
Year five 1,338   1,338   503
Prior 4,780   4,780   4,136
Revolving Loans Amortized Cost Basis 443,213   443,213   334,913
Total 456,839   456,839   344,808
Current Period Gross Charge-Offs          
Year one     0   0
Year two     0   0
Year three     0   62
Year four     68   99
Year five     0   0
Prior     3   0
Revolving Loans Amortized Cost Basis     0   9
Total 71 0 71 134 170
Home Equity Loans | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 360   360   172
Year two 1,004   1,004   161
Year three 1,503   1,503   3,721
Year four 4,161   4,161   773
Year five 1,113   1,113   478
Prior 4,625   4,625   3,532
Revolving Loans Amortized Cost Basis 443,188   443,188   334,884
Total 455,954   455,954   343,721
Home Equity Loans | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 58   58   128
Year three 128   128   277
Year four 294   294   24
Year five 225   225   25
Prior 155   155   604
Revolving Loans Amortized Cost Basis 25   25   29
Total 885   885   1,087
Residential Mortgage Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 69,752   69,752   48,957
Year two 87,215   87,215   51,273
Year three 103,747   103,747   58,217
Year four 195,146   195,146   73,908
Year five 147,742   147,742   35,604
Prior 189,068   189,068   89,489
Revolving Loans Amortized Cost Basis 0   0   0
Total 792,670   792,670   357,448
Current Period Gross Charge-Offs          
Year one     0   0
Year two     0   0
Year three     39   0
Year four     0   0
Year five     32   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Total 43 $ 0 71 $ 0 0
Residential Mortgage Loans | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 69,752   69,752   48,957
Year two 86,995   86,995   51,059
Year three 102,557   102,557   57,988
Year four 194,918   194,918   73,239
Year five 146,897   146,897   35,370
Prior 187,538   187,538   88,633
Revolving Loans Amortized Cost Basis 0   0   0
Total 788,657   788,657   355,246
Residential Mortgage Loans | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 220   220   214
Year three 1,190   1,190   229
Year four 228   228   669
Year five 845   845   234
Prior 1,530   1,530   856
Revolving Loans Amortized Cost Basis 0   0   0
Total $ 4,013   $ 4,013   $ 2,202