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Loans (Credit Quality Indicators Vintage) (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]          
Term loans amortized cost, current year $ 236,511   $ 236,511   $ 878,981
Term loans amortized cost, prior year 907,727   907,727   1,551,627
Term loans amortized cost, two years ago 1,531,281   1,531,281   1,144,330
Term loans amortized cost, three years ago 1,030,520   1,030,520   478,623
Term loans amortized cost, four years ago 416,157   416,157   372,009
Term loans amortized cost, five years ago or more 1,045,024   1,045,024   831,226
Revolving loans amortized cost 332,772   332,772   375,764
Revolving loans converted to term loans 14,897   14,897   15,146
Total 5,514,889   5,514,889   5,647,706
Gross charge-offs, current year     177   196
Gross charge-offs, prior year     0   0
Gross charge-offs, two years ago     0   8
Gross charge-offs, three years ago     0   0
Gross charge-offs, four years ago     2   0
Gross charge-offs, five years ago or more     3   373
Gross charge-offs, revolving loans     0   0
Gross charge-offs, revolving loans converted to term loans     0   0
Total gross charge-offs 59 $ 44 182 $ 157 577
Basis adjustment associated with fair value hedges (19)   (19)    
Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 123,469   123,469   348,969
Term loans amortized cost, prior year 419,332   419,332   598,946
Term loans amortized cost, two years ago 595,793   595,793   414,898
Term loans amortized cost, three years ago 363,292   363,292   168,451
Term loans amortized cost, four years ago 126,092   126,092   181,982
Term loans amortized cost, five years ago or more 460,413   460,413   349,986
Revolving loans amortized cost 12,702   12,702   42,095
Revolving loans converted to term loans 998   998   1,032
Total 2,102,091   2,102,091   2,106,359
Gross charge-offs, current year     0   0
Gross charge-offs, prior year     0   0
Gross charge-offs, two years ago     0   0
Gross charge-offs, three years ago     0   0
Gross charge-offs, four years ago     0   0
Gross charge-offs, five years ago or more     0   373
Gross charge-offs, revolving loans     0   0
Gross charge-offs, revolving loans converted to term loans     0   0
Total gross charge-offs 0 0 0 0 373
Commercial real estate | Pass [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 102,951   102,951   327,139
Term loans amortized cost, prior year 411,548   411,548   598,946
Term loans amortized cost, two years ago 595,793   595,793   396,468
Term loans amortized cost, three years ago 363,292   363,292   168,451
Term loans amortized cost, four years ago 126,092   126,092   167,484
Term loans amortized cost, five years ago or more 440,220   440,220   333,356
Revolving loans amortized cost 12,702   12,702   42,095
Revolving loans converted to term loans 998   998   1,032
Total 2,053,596   2,053,596   2,034,971
Commercial real estate | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 0   0   0
Term loans amortized cost, prior year 0   0   0
Term loans amortized cost, two years ago 0   0   0
Term loans amortized cost, three years ago 0   0   0
Term loans amortized cost, four years ago 0   0   0
Term loans amortized cost, five years ago or more 6,291   6,291   16,630
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 6,291   6,291   16,630
Commercial real estate | Classified [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 20,518   20,518   21,830
Term loans amortized cost, prior year 7,784   7,784   0
Term loans amortized cost, two years ago 0   0   18,430
Term loans amortized cost, three years ago 0   0   0
Term loans amortized cost, four years ago 0   0   14,498
Term loans amortized cost, five years ago or more 13,902   13,902   0
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 42,204   42,204   54,758
Commercial & industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 37,209   37,209   66,726
Term loans amortized cost, prior year 51,886   51,886   125,712
Term loans amortized cost, two years ago 138,510   138,510   52,471
Term loans amortized cost, three years ago 25,400   25,400   49,812
Term loans amortized cost, four years ago 46,954   46,954   73,739
Term loans amortized cost, five years ago or more 174,703   174,703   145,361
Revolving loans amortized cost 91,117   91,117   90,664
Revolving loans converted to term loans 500   500   587
Total 566,279   566,279   605,072
Gross charge-offs, current year     24   37
Gross charge-offs, prior year     0   0
Gross charge-offs, two years ago     0   0
Gross charge-offs, three years ago     0   0
Gross charge-offs, four years ago     0   0
Gross charge-offs, five years ago or more     0   0
Gross charge-offs, revolving loans     0   0
Gross charge-offs, revolving loans converted to term loans     0   0
Total gross charge-offs 4 5 24 25 37
Commercial & industrial | Pass [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 36,394   36,394   55,607
Term loans amortized cost, prior year 51,886   51,886   124,894
Term loans amortized cost, two years ago 134,880   134,880   52,282
Term loans amortized cost, three years ago 24,008   24,008   49,812
Term loans amortized cost, four years ago 45,534   45,534   72,876
Term loans amortized cost, five years ago or more 167,399   167,399   145,361
Revolving loans amortized cost 86,116   86,116   90,664
Revolving loans converted to term loans 500   500   587
Total 546,717   546,717   592,083
Commercial & industrial | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 0   0   11,119
Term loans amortized cost, prior year 0   0   0
Term loans amortized cost, two years ago 3,630   3,630   0
Term loans amortized cost, three years ago 1,223   1,223   0
Term loans amortized cost, four years ago 1,420   1,420   181
Term loans amortized cost, five years ago or more 6,511   6,511   0
Revolving loans amortized cost 5,001   5,001   0
Revolving loans converted to term loans 0   0   0
Total 17,785   17,785   11,300
Commercial & industrial | Classified [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 815   815   0
Term loans amortized cost, prior year 0   0   818
Term loans amortized cost, two years ago 0   0   189
Term loans amortized cost, three years ago 169   169   0
Term loans amortized cost, four years ago 0   0   682
Term loans amortized cost, five years ago or more 793   793   0
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 1,777   1,777   1,689
Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 61,973   61,973   431,563
Term loans amortized cost, prior year 412,571   412,571   808,442
Term loans amortized cost, two years ago 780,622   780,622   666,447
Term loans amortized cost, three years ago 633,280   633,280   256,440
Term loans amortized cost, four years ago 239,744   239,744   114,056
Term loans amortized cost, five years ago or more 401,226   401,226   327,530
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 2,529,416   2,529,416   2,604,478
Gross charge-offs, current year     0   0
Gross charge-offs, prior year     0   0
Gross charge-offs, two years ago     0   0
Gross charge-offs, three years ago     0   0
Gross charge-offs, four years ago     0   0
Gross charge-offs, five years ago or more     0   0
Gross charge-offs, revolving loans     0   0
Gross charge-offs, revolving loans converted to term loans     0   0
Total gross charge-offs 0 0 0 0 0
Residential real estate | Current [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 61,973   61,973   431,563
Term loans amortized cost, prior year 412,283   412,283   808,442
Term loans amortized cost, two years ago 780,622   780,622   666,447
Term loans amortized cost, three years ago 633,280   633,280   255,554
Term loans amortized cost, four years ago 239,234   239,234   113,462
Term loans amortized cost, five years ago or more 395,077 [1]   395,077 [1]   320,894
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 2,522,469 [1]   2,522,469 [1]   2,596,362
Residential real estate | Past Due [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 0   0   0
Term loans amortized cost, prior year 288   288   0
Term loans amortized cost, two years ago 0   0   0
Term loans amortized cost, three years ago 0   0   886
Term loans amortized cost, four years ago 510   510   594
Term loans amortized cost, five years ago or more 6,149   6,149   6,636
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 6,947   6,947   8,116
Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 10,553   10,553   24,925
Term loans amortized cost, prior year 19,164   19,164   14,997
Term loans amortized cost, two years ago 13,286   13,286   6,829
Term loans amortized cost, three years ago 6,298   6,298   2,919
Term loans amortized cost, four years ago 2,510   2,510   2,112
Term loans amortized cost, five years ago or more 5,453   5,453   4,525
Revolving loans amortized cost 228,716   228,716   242,760
Revolving loans converted to term loans 13,399   13,399   13,527
Total 299,379   299,379   312,594
Gross charge-offs, current year     0   0
Gross charge-offs, prior year     0   0
Gross charge-offs, two years ago     0   0
Gross charge-offs, three years ago     0   0
Gross charge-offs, four years ago     0   0
Gross charge-offs, five years ago or more     0   0
Gross charge-offs, revolving loans     0   0
Gross charge-offs, revolving loans converted to term loans     0   0
Total gross charge-offs 0 0 0 0 0
Home equity | Current [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 10,553   10,553   24,925
Term loans amortized cost, prior year 18,968   18,968   14,997
Term loans amortized cost, two years ago 13,186   13,186   6,829
Term loans amortized cost, three years ago 6,298   6,298   2,919
Term loans amortized cost, four years ago 2,368   2,368   1,982
Term loans amortized cost, five years ago or more 4,580   4,580   3,696
Revolving loans amortized cost 227,817   227,817   241,459
Revolving loans converted to term loans 12,809   12,809   12,591
Total 296,579   296,579   309,398
Home equity | Past Due [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 0   0   0
Term loans amortized cost, prior year 196   196   0
Term loans amortized cost, two years ago 100   100   0
Term loans amortized cost, three years ago 0   0   0
Term loans amortized cost, four years ago 142   142   130
Term loans amortized cost, five years ago or more 873   873   829
Revolving loans amortized cost 899   899   1,301
Revolving loans converted to term loans 590   590   936
Total 2,800   2,800   3,196
Other          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 3,307   3,307   6,798
Term loans amortized cost, prior year 4,774   4,774   3,530
Term loans amortized cost, two years ago 3,070   3,070   3,685
Term loans amortized cost, three years ago 2,250   2,250   1,001
Term loans amortized cost, four years ago 857   857   120
Term loans amortized cost, five years ago or more 3,229   3,229   3,824
Revolving loans amortized cost 237   237   245
Revolving loans converted to term loans 0   0   0
Total 17,724   17,724   19,203
Gross charge-offs, current year     153   159
Gross charge-offs, prior year     0   0
Gross charge-offs, two years ago     0   8
Gross charge-offs, three years ago     0   0
Gross charge-offs, four years ago     2   0
Gross charge-offs, five years ago or more     3   0
Gross charge-offs, revolving loans     0   0
Gross charge-offs, revolving loans converted to term loans     0   0
Total gross charge-offs 55 $ 39 158 $ 132 167
Other | Current [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 3,266   3,266   6,777
Term loans amortized cost, prior year 4,774   4,774   3,530
Term loans amortized cost, two years ago 3,046   3,046   3,685
Term loans amortized cost, three years ago 2,241   2,241   1,001
Term loans amortized cost, four years ago 857   857   120
Term loans amortized cost, five years ago or more 3,228   3,228   3,824
Revolving loans amortized cost 237   237   243
Revolving loans converted to term loans 0   0   0
Total 17,649   17,649   19,180
Other | Past Due [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 41   41   21
Term loans amortized cost, prior year 0   0   0
Term loans amortized cost, two years ago 24   24   0
Term loans amortized cost, three years ago 9   9   0
Term loans amortized cost, four years ago 0   0   0
Term loans amortized cost, five years ago or more 1   1   0
Revolving loans amortized cost 0   0   2
Revolving loans converted to term loans 0   0   0
Total $ 75   $ 75   $ 23
[1] Excludes a $19 thousand negative basis adjustment associated with fair value hedges. See Note 6 for additional disclosure.