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Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (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
Total Loan Balance          
Current fiscal year $ 532,634   $ 532,634   $ 1,117,436
Year two 1,165,227   1,165,227   1,320,936
Year three 1,263,568   1,263,568   1,094,225
Year four 942,600   942,600   503,703
Year five 451,252   451,252   645,502
More than five years 2,036,020   2,036,020   1,650,211
Revolving 1,263,917   1,263,917   1,292,135
Revolving-Term 33,836   33,836   29,193
Total 7,689,054   7,689,054   7,653,341
Year-to-date Gross Charge-offs          
Current fiscal year     676   830
Year two     96   214
Year three     136   218
Year four     1,310   25
Year five     84   3,989
More than five years     5,635   18,669
Revolving     1,081   109
Revolving-Term     1,205   584
Total 2,440 $ 4,077 10,223 $ 20,758 24,638
Pass          
Total Loan Balance          
Current fiscal year 532,201   532,201   1,117,247
Year two 1,159,202   1,159,202   1,318,412
Year three 1,259,316   1,259,316   1,060,514
Year four 914,805   914,805   499,034
Year five 446,709   446,709   595,848
More than five years 1,874,476   1,874,476   1,473,853
Revolving 1,216,570   1,216,570   1,253,528
Revolving-Term 30,587   30,587   25,838
Total 7,433,866   7,433,866   7,344,274
Special mention          
Total Loan Balance          
Current fiscal year 0   0   189
Year two 2,000   2,000   1,681
Year three 1,992   1,992   16,493
Year four 2,622   2,622   224
Year five 148   148   24,920
More than five years 74,824   74,824   87,973
Revolving 14,429   14,429   4,163
Revolving-Term 274   274   172
Total 96,289   96,289   135,815
Substandard          
Total Loan Balance          
Current fiscal year 433   433   0
Year two 4,025   4,025   843
Year three 2,260   2,260   17,218
Year four 25,173   25,173   4,445
Year five 4,395   4,395   24,734
More than five years 84,792   84,792   88,385
Revolving 32,624   32,624   34,444
Revolving-Term 2,975   2,975   3,183
Total 156,677   156,677   173,252
Doubtful          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 1,928   1,928   0
Revolving 294   294   0
Revolving-Term 0   0   0
Total 2,222   2,222   0
Commercial Loans | Commercial real estate          
Total Loan Balance          
Current fiscal year 122,012   122,012   276,677
Year two 287,445   287,445   324,469
Year three 369,944   369,944   439,308
Year four 412,477   412,477   240,256
Year five 218,149   218,149   419,371
More than five years 1,217,037   1,217,037   926,636
Revolving 33,752   33,752   32,418
Revolving-Term 0   0   0
Total 2,660,816   2,660,816   2,659,135
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   0
Year three     0   0
Year four     0   0
Year five     0   0
More than five years     5,205   1,706
Revolving     0   0
Revolving-Term     0   0
Total 0 0 5,205 0 1,706
Commercial Loans | Commercial and industrial          
Total Loan Balance          
Current fiscal year 61,621   61,621   171,861
Year two 168,934   168,934   231,978
Year three 217,452   217,452   210,636
Year four 162,667   162,667   54,696
Year five 42,312   42,312   52,858
More than five years 206,647   206,647   193,905
Revolving 503,844   503,844   520,249
Revolving-Term 0   0   0
Total 1,363,477   1,363,477   1,436,183
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     78   0
Year three     0   0
Year four     1,235   0
Year five     0   3,412
More than five years     91   15,842
Revolving     1,032   0
Revolving-Term     0   0
Total 1,308 3,033 2,436 18,253 19,254
Commercial Loans | Commercial construction          
Total Loan Balance          
Current fiscal year 70,752   70,752   75,596
Year two 116,904   116,904   154,456
Year three 115,703   115,703   82,313
Year four 44,394   44,394   14,845
Year five 12,579   12,579   4,727
More than five years 6,274   6,274   4,438
Revolving 7,693   7,693   14,208
Revolving-Term 0   0   0
Total 374,299   374,299   350,583
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   0
Year three     0   0
Year four     0   0
Year five     0   451
More than five years     0   0
Revolving     0   0
Revolving-Term     0   0
Total 0 0 0 0 451
Commercial Loans | Business banking          
Total Loan Balance          
Current fiscal year 103,628   103,628   270,129
Year two 244,309   244,309   262,606
Year three 225,878   225,878   207,611
Year four 179,543   179,543   88,018
Year five 78,867   78,867   99,574
More than five years 369,124   369,124   334,766
Revolving 88,495   88,495   96,754
Revolving-Term 1,236   1,236   1,307
Total 1,291,080   1,291,080   1,360,765
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   67
Year three     31   43
Year four     0   1
Year five     56   88
More than five years     286   1,073
Revolving     0   34
Revolving-Term     0   0
Total 179 590 373 1,252 1,306
Commercial Loans | Pass | Commercial real estate          
Total Loan Balance          
Current fiscal year 122,012   122,012   276,677
Year two 285,445   285,445   323,463
Year three 368,565   368,565   433,308
Year four 410,624   410,624   237,901
Year five 215,872   215,872   383,799
More than five years 1,095,671   1,095,671   781,465
Revolving 33,497   33,497   32,418
Revolving-Term 0   0   0
Total 2,531,686   2,531,686   2,469,031
Commercial Loans | Pass | Commercial and industrial          
Total Loan Balance          
Current fiscal year 61,210   61,210   171,672
Year two 167,707   167,707   231,114
Year three 215,943   215,943   185,884
Year four 140,454   140,454   53,101
Year five 41,037   41,037   47,063
More than five years 191,486   191,486   183,165
Revolving 457,970   457,970   482,490
Revolving-Term 0   0   0
Total 1,275,807   1,275,807   1,354,489
Commercial Loans | Pass | Commercial construction          
Total Loan Balance          
Current fiscal year 70,752   70,752   75,596
Year two 116,904   116,904   154,456
Year three 115,703   115,703   82,313
Year four 44,394   44,394   14,845
Year five 12,579   12,579   151
More than five years 2,858   2,858   4,054
Revolving 7,693   7,693   14,208
Revolving-Term 0   0   0
Total 370,883   370,883   345,623
Commercial Loans | Pass | Business banking          
Total Loan Balance          
Current fiscal year 103,606   103,606   270,129
Year two 241,984   241,984   262,535
Year three 224,558   224,558   204,874
Year four 176,031   176,031   87,346
Year five 78,046   78,046   96,371
More than five years 354,093   354,093   321,360
Revolving 88,368   88,368   96,618
Revolving-Term 472   472   523
Total 1,267,158   1,267,158   1,339,756
Commercial Loans | Special mention | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 2,000   2,000   1,006
Year three 390   390   6,000
Year four 1,853   1,853   0
Year five 0   0   24,887
More than five years 60,814   60,814   75,428
Revolving 255   255   0
Revolving-Term 0   0   0
Total 65,312   65,312   107,321
Commercial Loans | Special mention | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   189
Year two 0   0   620
Year three 1,306   1,306   10,242
Year four 703   703   0
Year five 0   0   0
More than five years 7,748   7,748   8,848
Revolving 14,149   14,149   4,126
Revolving-Term 0   0   0
Total 23,906   23,906   24,025
Commercial Loans | Special mention | Commercial construction          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 0   0   0
Commercial Loans | Special mention | Business banking          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   55
Year three 296   296   251
Year four 66   66   224
Year five 148   148   33
More than five years 4,410   4,410   3,508
Revolving 25   25   37
Revolving-Term 274   274   172
Total 5,219   5,219   4,280
Commercial Loans | Substandard | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 989   989   0
Year four 0   0   2,355
Year five 2,277   2,277   10,685
More than five years 58,624   58,624   69,743
Revolving 0   0   0
Revolving-Term 0   0   0
Total 61,890   61,890   82,783
Commercial Loans | Substandard | Commercial and industrial          
Total Loan Balance          
Current fiscal year 411   411   0
Year two 1,227   1,227   244
Year three 203   203   14,510
Year four 21,510   21,510   1,595
Year five 1,275   1,275   5,795
More than five years 7,413   7,413   1,892
Revolving 31,431   31,431   33,633
Revolving-Term 0   0   0
Total 63,470   63,470   57,669
Commercial Loans | Substandard | Commercial construction          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   4,576
More than five years 3,416   3,416   384
Revolving 0   0   0
Revolving-Term 0   0   0
Total 3,416   3,416   4,960
Commercial Loans | Substandard | Business banking          
Total Loan Balance          
Current fiscal year 22   22   0
Year two 2,325   2,325   16
Year three 1,024   1,024   2,486
Year four 3,446   3,446   448
Year five 673   673   3,170
More than five years 10,621   10,621   9,898
Revolving 102   102   99
Revolving-Term 490   490   612
Total 18,703   18,703   16,729
Commercial Loans | Doubtful | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 1,928   1,928   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 1,928   1,928   0
Commercial Loans | Doubtful | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 0   0   0
Revolving 294   294   0
Revolving-Term 0   0   0
Total 294   294   0
Commercial Loans | Doubtful | Commercial construction          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 0   0   0
Commercial Loans | Doubtful | Business banking          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 0   0   0
Consumer Loans | Consumer real estate          
Total Loan Balance          
Current fiscal year 167,541   167,541   311,887
Year two 339,911   339,911   335,462
Year three 326,286   326,286   147,850
Year four 139,497   139,497   102,041
Year five 97,115   97,115   67,890
More than five years 236,193   236,193   189,794
Revolving 560,726   560,726   552,080
Revolving-Term 26,878   26,878   24,774
Total 1,894,147   1,894,147   1,731,778
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   1
Year three     0   0
Year four     0   5
Year five     9   1
More than five years     37   43
Revolving     49   75
Revolving-Term     992   296
Total 616 107 1,087 224 421
Consumer Loans | Other consumer          
Total Loan Balance          
Current fiscal year 7,080   7,080   11,286
Year two 7,724   7,724   11,965
Year three 8,305   8,305   6,507
Year four 4,022   4,022   3,847
Year five 2,230   2,230   1,082
More than five years 745   745   672
Revolving 69,407   69,407   76,426
Revolving-Term 5,722   5,722   3,112
Total 105,235   105,235   114,897
Year-to-date Gross Charge-offs          
Current fiscal year     676   830
Year two     18   146
Year three     105   175
Year four     75   19
Year five     19   37
More than five years     16   5
Revolving     0   0
Revolving-Term     213   288
Total 337 $ 347 1,122 $ 1,029 1,500
Consumer Loans | Pass | Consumer real estate          
Total Loan Balance          
Current fiscal year 167,541   167,541   311,887
Year two 339,438   339,438   334,879
Year three 326,242   326,242   147,652
Year four 139,304   139,304   101,999
Year five 96,961   96,961   67,402
More than five years 229,781   229,781   183,283
Revolving 559,635   559,635   551,368
Revolving-Term 24,396   24,396   22,206
Total 1,883,298   1,883,298   1,720,676
Consumer Loans | Pass | Other consumer          
Total Loan Balance          
Current fiscal year 7,080   7,080   11,286
Year two 7,724   7,724   11,965
Year three 8,305   8,305   6,483
Year four 3,998   3,998   3,842
Year five 2,214   2,214   1,062
More than five years 587   587   526
Revolving 69,407   69,407   76,426
Revolving-Term 5,719   5,719   3,109
Total 105,034   105,034   114,699
Consumer Loans | Special mention | Consumer real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 1,852   1,852   189
Revolving 0   0   0
Revolving-Term 0   0   0
Total 1,852   1,852   189
Consumer Loans | Special mention | Other consumer          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term     0
Total 0   0   0
Consumer Loans | Substandard | Consumer real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 473   473   583
Year three 44   44   198
Year four 193   193   42
Year five 154   154   488
More than five years 4,560   4,560   6,322
Revolving 1,091   1,091   712
Revolving-Term 2,482   2,482   2,568
Total 8,997   8,997   10,913
Consumer Loans | Substandard | Other consumer          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   24
Year four 24   24   5
Year five 16   16   20
More than five years 158   158   146
Revolving 0   0   0
Revolving-Term 3   3   3
Total 201   201   198
Consumer Loans | Doubtful | Consumer real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 0   0   0
Consumer Loans | Doubtful | Other consumer          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total $ 0   $ 0   $ 0