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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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Total Loan Balance          
Current fiscal year $ 441,085   $ 441,085   $ 1,166,736
Year two 1,229,953   1,229,953   890,701
Year three 851,627   851,627   995,373
Year four 907,563   907,563   988,809
Year five 893,329   893,329   722,161
More than five years 2,311,779   2,311,779   1,900,975
Revolving 1,369,013   1,369,013   1,362,700
Revolving-Term 54,037   54,037   44,502
Total 8,058,386   8,058,386   8,071,957
Year-to-date Gross Charge-offs          
Current fiscal year     377   1,288
Year two     296   89
Year three     126   4,316
Year four     905   5,311
Year five     53   255
More than five years     146   5,434
Revolving     610   224
Revolving-Term     658   1,158
Total 1,236 $ 1,656 3,171 $ 2,540 18,075
Pass          
Total Loan Balance          
Current fiscal year 441,085   441,085   1,166,736
Year two 1,224,116   1,224,116   885,598
Year three 846,214   846,214   979,038
Year four 887,323   887,323   975,693
Year five 873,392   873,392   685,519
More than five years 2,193,564   2,193,564   1,821,062
Revolving 1,300,217   1,300,217   1,322,643
Revolving-Term 50,114   50,114   39,961
Total 7,816,025   7,816,025   7,876,250
Special mention          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 5,550   5,550   3,651
Year three 4,147   4,147   2,423
Year four 11,040   11,040   8,686
Year five 16,104   16,104   3,288
More than five years 60,923   60,923   42,371
Revolving 45,074   45,074   8,437
Revolving-Term 112   112   161
Total 142,950   142,950   69,017
Substandard          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 287   287   1,452
Year three 1,266   1,266   13,912
Year four 9,200   9,200   4,430
Year five 3,833   3,833   33,354
More than five years 57,292   57,292   37,542
Revolving 21,301   21,301   30,010
Revolving-Term 3,811   3,811   4,380
Total 96,990   96,990   125,080
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 0   0   0
Revolving 2,421   2,421   1,610
Revolving-Term 0   0   0
Total 2,421   2,421   1,610
Commercial loans | Commercial real estate          
Total Loan Balance          
Current fiscal year 136,999   136,999   480,967
Year two 479,147   479,147   315,684
Year three 336,323   336,323   326,048
Year four 292,910   292,910   319,652
Year five 276,039   276,039   343,726
More than five years 1,225,011   1,225,011   1,093,130
Revolving 37,889   37,889   42,554
Revolving-Term 0   0   0
Total 2,784,318   2,784,318   2,921,761
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   0
Year three     0   0
Year four     0   4,907
Year five     0   0
More than five years     0   2,432
Revolving     0   0
Revolving-Term     0   0
Total 0 0 0 0 7,339
Commercial loans | Commercial and industrial          
Total Loan Balance          
Current fiscal year 142,993   142,993   161,634
Year two 153,924   153,924   96,065
Year three 88,302   88,302   115,559
Year four 106,585   106,585   139,784
Year five 119,285   119,285   93,561
More than five years 254,012   254,012   184,888
Revolving 542,933   542,933   539,114
Revolving-Term     0
Total 1,408,034   1,408,034   1,330,605
Year-to-date Gross Charge-offs          
Current fiscal year     0   256
Year two     0   0
Year three     0   4,014
Year four     198   172
Year five     0   0
More than five years     0   2,089
Revolving     555   192
Revolving-Term     0   0
Total 555 256 753 428 6,723
Commercial loans | Commercial construction          
Total Loan Balance          
Current fiscal year 61,703   61,703   172,822
Year two 257,445   257,445   119,821
Year three 91,356   91,356   43,093
Year four 35,260   35,260   18,762
Year five 9,314   9,314   2,520
More than five years 2,795   2,795   1,260
Revolving 8,337   8,337   7,099
Revolving-Term 0   0   0
Total 466,210   466,210   365,377
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   0
Year three     69   0
Year four     0   118
Year five     0   0
More than five years     0   0
Revolving     0   0
Revolving-Term     0   0
Total 69 89 69 119 118
Commercial loans | Business banking          
Total Loan Balance          
Current fiscal year 56,851   56,851   182,401
Year two 173,803   173,803   132,590
Year three 122,530   122,530   206,281
Year four 188,163   188,163   199,780
Year five 192,035   192,035   161,293
More than five years 461,567   461,567   338,580
Revolving 93,236   93,236   93,856
Revolving-Term 948   948   1,082
Total 1,289,133   1,289,133   1,315,863
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     296   19
Year three     0   132
Year four     414   39
Year five     21   225
More than five years     76   699
Revolving     10   0
Revolving-Term     0   0
Total 263 179 817 322 1,114
Commercial loans | Pass | Commercial real estate          
Total Loan Balance          
Current fiscal year 136,999   136,999   480,967
Year two 474,872   474,872   312,777
Year three 333,754   333,754   322,165
Year four 288,371   288,371   311,087
Year five 267,047   267,047   328,936
More than five years 1,160,002   1,160,002   1,047,543
Revolving 36,559   36,559   42,300
Revolving-Term 0   0   0
Total 2,697,604   2,697,604   2,845,775
Commercial loans | Pass | Commercial and industrial          
Total Loan Balance          
Current fiscal year 142,993   142,993   161,634
Year two 152,649   152,649   95,715
Year three 87,518   87,518   111,222
Year four 100,038   100,038   138,390
Year five 113,176   113,176   75,406
More than five years 218,578   218,578   165,633
Revolving 477,506   477,506   501,472
Revolving-Term 0   0   0
Total 1,292,458   1,292,458   1,249,472
Commercial loans | Pass | Commercial construction          
Total Loan Balance          
Current fiscal year 61,703   61,703   172,822
Year two 257,445   257,445   118,952
Year three 91,356   91,356   43,093
Year four 35,260   35,260   18,762
Year five 9,314   9,314   2,520
More than five years 2,795   2,795   1,260
Revolving 8,337   8,337   7,099
Revolving-Term 0   0   0
Total 466,210   466,210   364,508
Commercial loans | Pass | Business banking          
Total Loan Balance          
Current fiscal year 56,851   56,851   182,401
Year two 173,803   173,803   132,196
Year three 121,302   121,302   201,106
Year four 182,080   182,080   197,145
Year five 187,915   187,915   157,792
More than five years 448,349   448,349   328,135
Revolving 92,927   92,927   93,701
Revolving-Term 333   333   453
Total 1,263,560   1,263,560   1,292,929
Commercial loans | Special mention | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 4,275   4,275   2,907
Year three 2,569   2,569   0
Year four 4,539   4,539   6,865
Year five 8,262   8,262   3,148
More than five years 43,159   43,159   25,805
Revolving 1,330   1,330   254
Revolving-Term 0   0   0
Total 64,134   64,134   38,979
Commercial loans | Special mention | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 1,275   1,275   350
Year three 784   784   2,423
Year four 4,733   4,733   1,394
Year five 6,109   6,109   3
More than five years 14,207   14,207   13,611
Revolving 43,502   43,502   8,179
Revolving-Term 0   0   0
Total 70,610   70,610   25,960
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   394
Year three 794   794   0
Year four 1,768   1,768   427
Year five 1,733   1,733   137
More than five years 3,481   3,481   2,871
Revolving 242   242   4
Revolving-Term 112   112   161
Total 8,130   8,130   3,994
Commercial loans | Substandard | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   3,883
Year four 0   0   1,700
Year five 730   730   11,642
More than five years 21,850   21,850   19,782
Revolving 0   0   0
Revolving-Term 0   0   0
Total 22,580   22,580   37,007
Commercial loans | Substandard | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   1,914
Year four 1,814   1,814   0
Year five 0   0   18,152
More than five years 21,227   21,227   5,644
Revolving 19,504   19,504   27,853
Revolving-Term 0   0   0
Total 42,545   42,545   53,563
Commercial loans | Substandard | Commercial construction          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   869
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   869
Commercial loans | Substandard | Business banking          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 434   434   5,175
Year four 4,315   4,315   2,208
Year five 2,387   2,387   3,364
More than five years 9,737   9,737   7,574
Revolving 67   67   151
Revolving-Term 503   503   468
Total 17,443   17,443   18,940
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 0   0   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 0   0   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 2,421   2,421   1,610
Revolving-Term 0   0   0
Total 2,421   2,421   1,610
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 39,081   39,081   161,896
Year two 160,319   160,319   221,288
Year three 209,046   209,046   300,460
Year four 281,854   281,854   306,962
Year five 294,037   294,037   119,961
More than five years 367,067   367,067   281,990
Revolving 641,309   641,309   620,773
Revolving-Term 37,892   37,892   33,741
Total 2,030,605   2,030,605   2,047,071
Year-to-date Gross Charge-offs          
Current fiscal year       5
Year two     0   35
Year three     28   134
Year four     281   2
Year five     0   0
More than five years     51   156
Revolving     45   31
Revolving-Term     97   465
Total 201 390 502 552 828
Consumer loans | Other consumer          
Total Loan Balance          
Current fiscal year 3,458   3,458   7,016
Year two 5,315   5,315   5,253
Year three 4,070   4,070   3,932
Year four 2,791   2,791   3,869
Year five 2,619   2,619   1,100
More than five years 1,327   1,327   1,127
Revolving 45,309   45,309   59,304
Revolving-Term 15,197   15,197   9,679
Total 80,086   80,086   91,280
Year-to-date Gross Charge-offs          
Current fiscal year     377   1,027
Year two     0   35
Year three     29   36
Year four     12   73
Year five     32   30
More than five years     19   58
Revolving     0   1
Revolving-Term     561   693
Total 148 $ 742 1,030 $ 1,119 1,953
Consumer loans | Pass | Consumer real estate          
Total Loan Balance          
Current fiscal year 39,081   39,081   161,896
Year two 160,032   160,032   220,705
Year three 208,214   208,214   297,533
Year four 278,803   278,803   306,440
Year five 293,321   293,321   119,775
More than five years 362,658   362,658   277,507
Revolving 639,579   639,579   618,767
Revolving-Term 34,599   34,599   29,868
Total 2,016,287   2,016,287   2,032,491
Consumer loans | Pass | Other consumer          
Total Loan Balance          
Current fiscal year 3,458   3,458   7,016
Year two 5,315   5,315   5,253
Year three 4,070   4,070   3,919
Year four 2,771   2,771   3,869
Year five 2,619   2,619   1,090
More than five years 1,182   1,182   984
Revolving 45,309   45,309   59,304
Revolving-Term 15,182   15,182   9,640
Total 79,906   79,906   91,075
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 76   76   84
Revolving 0   0   0
Revolving-Term 0   0   0
Total 76   76   84
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 287   287   583
Year three 832   832   2,927
Year four 3,051   3,051   522
Year five 716   716   186
More than five years 4,333   4,333   4,399
Revolving 1,730   1,730   2,006
Revolving-Term 3,293   3,293   3,873
Total 14,242   14,242   14,496
Consumer loans | Substandard | Other consumer          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 0   0   13
Year four 20   20   0
Year five 0   0   10
More than five years 145   145   143
Revolving 0   0   0
Revolving-Term 15   15   39
Total 180   180   205
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