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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 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Total Loan Balance          
Current fiscal year $ 567,185   $ 567,185   $ 893,015
Year two 900,274   900,274   1,134,650
Year three 1,061,781   1,061,781   1,191,528
Year four 1,124,721   1,124,721   897,782
Year five 831,096   831,096   421,743
More than five years 2,074,958   2,074,958   1,885,462
Revolving 1,334,790   1,334,790   1,284,808
Revolving-Term 39,629   39,629   33,970
Total 7,934,434   7,934,434   7,742,958
Year-to-date Gross Charge-offs          
Current fiscal year     594   839
Year two     13   191
Year three     197   288
Year four     343   1,338
Year five     53   91
More than five years     294   6,837
Revolving     30   1,118
Revolving-Term     1,016   1,486
Total 1,656 $ 845 2,540 $ 7,784 12,188
Pass          
Total Loan Balance          
Current fiscal year 567,185   567,185   892,431
Year two 898,314   898,314   1,128,069
Year three 1,049,655   1,049,655   1,171,403
Year four 1,106,167   1,106,167   870,715
Year five 805,125   805,125   417,507
More than five years 1,977,284   1,977,284   1,775,175
Revolving 1,281,367   1,281,367   1,243,868
Revolving-Term 36,023   36,023   30,962
Total 7,721,120   7,721,120   7,530,130
Special mention          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 384   384   2,020
Year three 2,253   2,253   17,638
Year four 15,723   15,723   2,112
Year five 2,621   2,621   157
More than five years 57,663   57,663   65,401
Revolving 20,625   20,625   11,322
Revolving-Term 162   162   268
Total 99,431   99,431   98,918
Substandard          
Total Loan Balance          
Current fiscal year 0   0   584
Year two 1,576   1,576   4,561
Year three 9,873   9,873   2,487
Year four 2,831   2,831   24,589
Year five 23,350   23,350   3,196
More than five years 40,011   40,011   44,886
Revolving 32,798   32,798   26,717
Revolving-Term 3,444   3,444   2,740
Total 113,883   113,883   109,760
Doubtful          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   366
Year five 0   0   883
More than five years 0   0   0
Revolving 0   0   2,901
Revolving-Term 0   0   0
Total 0   0   4,150
Commercial Loans | Commercial real estate          
Total Loan Balance          
Current fiscal year 256,433   256,433   278,187
Year two 283,027   283,027   289,081
Year three 296,050   296,050   363,529
Year four 353,480   353,480   415,621
Year five 388,471   388,471   215,632
More than five years 1,203,975   1,203,975   1,110,490
Revolving 43,037   43,037   35,991
Revolving-Term 0   0   0
Total 2,824,473   2,824,473   2,708,531
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     0   5,205
Revolving     0   0
Revolving-Term     0   0
Total 0 0 0 5,205 5,205
Commercial Loans | Commercial and industrial          
Total Loan Balance          
Current fiscal year 56,481   56,481   120,143
Year two 116,947   116,947   148,100
Year three 125,718   125,718   195,756
Year four 178,689   178,689   152,971
Year five 129,992   129,992   31,312
More than five years 186,727   186,727   197,426
Revolving 526,098   526,098   505,929
Revolving-Term 0   0   0
Total 1,320,652   1,320,652   1,351,637
Year-to-date Gross Charge-offs          
Current fiscal year     256   0
Year two     0   78
Year three     0   0
Year four     172   1,235
Year five     0   0
More than five years     0   91
Revolving     0   1,032
Revolving-Term     0   0
Total 256 0 428 1,128 2,436
Commercial Loans | Commercial construction          
Total Loan Balance          
Current fiscal year 79,460   79,460   119,355
Year two 128,037   128,037   121,816
Year three 101,433   101,433   73,851
Year four 56,394   56,394   14,911
Year five 12,273   12,273   884
More than five years 1,358   1,358   2,139
Revolving 7,284   7,284   8,310
Revolving-Term 0   0   0
Total 386,239   386,239   341,266
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   0
Year three     0   0
Year four     119   0
Year five     0   0
More than five years     0   0
Revolving     0   0
Revolving-Term     0   0
Total 89 0 119 0 0
Commercial Loans | Business banking          
Total Loan Balance          
Current fiscal year 95,474   95,474   149,624
Year two 142,410   142,410   233,041
Year three 219,575   219,575   226,654
Year four 214,311   214,311   177,683
Year five 170,102   170,102   76,643
More than five years 380,726   380,726   345,327
Revolving 95,699   95,699   92,981
Revolving-Term 1,113   1,113   1,305
Total 1,319,410   1,319,410   1,303,258
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   79
Year three     131   124
Year four     1   0
Year five     34   56
More than five years     156   1,486
Revolving     0   0
Revolving-Term     0   0
Total 179 96 322 194 1,745
Commercial Loans | Pass | Commercial real estate          
Total Loan Balance          
Current fiscal year 256,433   256,433   278,187
Year two 283,027   283,027   287,081
Year three 291,889   291,889   362,174
Year four 352,175   352,175   413,781
Year five 386,657   386,657   213,384
More than five years 1,144,116   1,144,116   1,040,703
Revolving 42,783   42,783   35,737
Revolving-Term 0   0   0
Total 2,757,080   2,757,080   2,631,047
Commercial Loans | Pass | Commercial and industrial          
Total Loan Balance          
Current fiscal year 56,481   56,481   119,580
Year two 116,416   116,416   147,007
Year three 121,931   121,931   194,363
Year four 178,019   178,019   131,877
Year five 110,610   110,610   30,093
More than five years 167,318   167,318   175,359
Revolving 475,019   475,019   466,640
Revolving-Term 0   0   0
Total 1,225,794   1,225,794   1,264,919
Commercial Loans | Pass | Commercial construction          
Total Loan Balance          
Current fiscal year 79,460   79,460   119,355
Year two 127,168   127,168   121,816
Year three 101,433   101,433   57,853
Year four 41,765   41,765   14,911
Year five 12,273   12,273   884
More than five years 1,358   1,358   2,139
Revolving 7,284   7,284   8,310
Revolving-Term 0   0   0
Total 370,741   370,741   325,268
Commercial Loans | Pass | Business banking          
Total Loan Balance          
Current fiscal year 95,474   95,474   149,603
Year two 142,007   142,007   230,784
Year three 216,736   216,736   225,318
Year four 212,660   212,660   173,763
Year five 165,531   165,531   76,087
More than five years 367,966   367,966   332,707
Revolving 95,412   95,412   92,756
Revolving-Term 388   388   597
Total 1,296,174   1,296,174   1,281,615
Commercial Loans | Special mention | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   2,000
Year three 225   225   370
Year four 330   330   1,840
Year five 1,814   1,814   0
More than five years 39,664   39,664   46,104
Revolving 254   254   254
Revolving-Term 0   0   0
Total 42,287   42,287   50,568
Commercial Loans | Special mention | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   20
Year three 2,028   2,028   1,221
Year four 670   670   142
Year five 9   9   10
More than five years 13,680   13,680   14,896
Revolving 20,338   20,338   11,033
Revolving-Term 0   0   0
Total 36,725   36,725   27,322
Commercial Loans | Special mention | Commercial construction          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   15,998
Year four 14,629   14,629   0
Year five 0   0   0
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 14,629   14,629   15,998
Commercial Loans | Special mention | Business banking          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 384   384   0
Year three 0   0   49
Year four 94   94   130
Year five 798   798   147
More than five years 4,228   4,228   4,302
Revolving 33   33   35
Revolving-Term 162   162   268
Total 5,699   5,699   4,931
Commercial Loans | Substandard | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 3,936   3,936   985
Year four 975   975   0
Year five 0   0   1,834
More than five years 20,195   20,195   23,683
Revolving 0   0   0
Revolving-Term 0   0   0
Total 25,106   25,106   26,502
Commercial Loans | Substandard | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   563
Year two 531   531   1,073
Year three 1,759   1,759   172
Year four 0   0   20,586
Year five 19,373   19,373   740
More than five years 5,729   5,729   7,171
Revolving 30,741   30,741   25,355
Revolving-Term 0   0   0
Total 58,133   58,133   55,660
Commercial Loans | Substandard | Commercial construction          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 869   869   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 869   869   0
Commercial Loans | Substandard | Business banking          
Total Loan Balance          
Current fiscal year 0   0   21
Year two 19   19   2,257
Year three 2,839   2,839   1,287
Year four 1,557   1,557   3,790
Year five 3,773   3,773   409
More than five years 8,532   8,532   8,318
Revolving 254   254   190
Revolving-Term 563   563   440
Total 17,537   17,537   16,712
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   414
More than five years 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 0   0   414
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   366
Year five 0   0   469
More than five years 0   0   0
Revolving 0   0   2,901
Revolving-Term 0   0   0
Total 0   0   3,736
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 75,177   75,177   217,250
Year two 223,416   223,416   335,763
Year three 313,759   313,759   324,389
Year four 316,323   316,323   133,347
Year five 128,238   128,238   95,504
More than five years 300,592   300,592   229,462
Revolving 593,255   593,255   570,558
Revolving-Term 32,723   32,723   27,236
Total 1,983,483   1,983,483   1,933,509
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     7   0
Year three     38   0
Year four     0   0
Year five     0   9
More than five years     83   37
Revolving     30   86
Revolving-Term     394   1,216
Total 390 332 552 471 1,348
Consumer Loans | Other consumer          
Total Loan Balance          
Current fiscal year 4,160   4,160   8,456
Year two 6,437   6,437   6,849
Year three 5,246   5,246   7,349
Year four 5,524   5,524   3,249
Year five 2,020   2,020   1,768
More than five years 1,580   1,580   618
Revolving 69,417   69,417   71,039
Revolving-Term 5,793   5,793   5,429
Total 100,177   100,177   104,757
Year-to-date Gross Charge-offs          
Current fiscal year     338   839
Year two     6   34
Year three     28   164
Year four     51   103
Year five     19   26
More than five years     55   18
Revolving     0   0
Revolving-Term     622   270
Total 742 $ 417 1,119 $ 786 1,454
Consumer Loans | Pass | Consumer real estate          
Total Loan Balance          
Current fiscal year 75,177   75,177   217,250
Year two 223,259   223,259   334,532
Year three 312,437   312,437   324,346
Year four 316,024   316,024   133,155
Year five 128,049   128,049   95,301
More than five years 295,095   295,095   223,799
Revolving 591,452   591,452   569,386
Revolving-Term 29,860   29,860   24,940
Total 1,971,353   1,971,353   1,922,709
Consumer Loans | Pass | Other consumer          
Total Loan Balance          
Current fiscal year 4,160   4,160   8,456
Year two 6,437   6,437   6,849
Year three 5,229   5,229   7,349
Year four 5,524   5,524   3,228
Year five 2,005   2,005   1,758
More than five years 1,431   1,431   468
Revolving 69,417   69,417   71,039
Revolving-Term 5,775   5,775   5,425
Total 99,978   99,978   104,572
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 91   91   99
Revolving 0   0   0
Revolving-Term 0   0   0
Total 91   91   99
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   0   0
Total 0   0   0
Consumer Loans | Substandard | Consumer real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 157   157   1,231
Year three 1,322   1,322   43
Year four 299   299   192
Year five 189   189   203
More than five years 5,406   5,406   5,564
Revolving 1,803   1,803   1,172
Revolving-Term 2,863   2,863   2,296
Total 12,039   12,039   10,701
Consumer Loans | Substandard | Other consumer          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 17   17   0
Year four 0   0   21
Year five 15   15   10
More than five years 149   149   150
Revolving 0   0   0
Revolving-Term 18   18   4
Total 199   199   185
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