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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Total Loan Balance          
Current fiscal year $ 307,409   $ 307,409   $ 1,117,436
Year two 1,160,151   1,160,151   1,320,936
Year three 1,289,981   1,289,981   1,094,225
Year four 1,029,790   1,029,790   503,703
Year five 469,249   469,249   645,502
More than five years 2,144,757   2,144,757   1,650,211
Revolving 1,279,143   1,279,143   1,292,135
Revolving-Term 33,090   33,090   29,193
Total 7,713,570   7,713,570   7,653,341
Year-to-date Gross Charge-offs          
Current fiscal year     434   830
Year two     11   214
Year three     100   218
Year four     1,083   25
Year five     34   3,989
More than five years     5,519   18,669
Revolving     17   109
Revolving-Term     586   584
Total 845 $ 12,222 7,784 $ 16,681 24,638
Pass          
Total Loan Balance          
Current fiscal year 307,063   307,063   1,117,247
Year two 1,156,330   1,156,330   1,318,412
Year three 1,286,092   1,286,092   1,060,514
Year four 996,944   996,944   499,034
Year five 464,568   464,568   595,848
More than five years 1,978,054   1,978,054   1,473,853
Revolving 1,232,133   1,232,133   1,253,528
Revolving-Term 29,658   29,658   25,838
Total 7,450,842   7,450,842   7,344,274
Special mention          
Total Loan Balance          
Current fiscal year 346   346   189
Year two 1,311   1,311   1,681
Year three 1,327   1,327   16,493
Year four 15,152   15,152   224
Year five 286   286   24,920
More than five years 80,683   80,683   87,973
Revolving 20,298   20,298   4,163
Revolving-Term 280   280   172
Total 119,683   119,683   135,815
Substandard          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 2,431   2,431   843
Year three 2,562   2,562   17,218
Year four 17,486   17,486   4,445
Year five 4,395   4,395   24,734
More than five years 84,035   84,035   88,385
Revolving 25,362   25,362   34,444
Revolving-Term 3,152   3,152   3,183
Total 139,423   139,423   173,252
Doubtful          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 79   79   0
Year three 0   0   0
Year four 208   208   0
Year five 0   0   0
More than five years 1,985   1,985   0
Revolving 1,350   1,350   0
Revolving-Term 0   0   0
Total 3,622   3,622   0
Commercial Loans | Commercial real estate          
Total Loan Balance          
Current fiscal year 48,148   48,148   276,677
Year two 278,373   278,373   324,469
Year three 373,948   373,948   439,308
Year four 451,757   451,757   240,256
Year five 222,926   222,926   419,371
More than five years 1,266,748   1,266,748   926,636
Revolving 30,627   30,627   32,418
Revolving-Term 0   0   0
Total 2,672,527   2,672,527   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 33,977   33,977   171,861
Year two 177,447   177,447   231,978
Year three 220,542   220,542   210,636
Year four 178,820   178,820   54,696
Year five 48,888   48,888   52,858
More than five years 236,343   236,343   193,905
Revolving 525,938   525,938   520,249
Revolving-Term 0   0   0
Total 1,421,955   1,421,955   1,436,183
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   0
Year three     0   0
Year four     1,037   0
Year five     0   3,412
More than five years     91   15,842
Revolving     0   0
Revolving-Term     0   0
Total 0 11,808 1,128 15,220 19,254
Commercial Loans | Commercial construction          
Total Loan Balance          
Current fiscal year 31,952   31,952   75,596
Year two 110,187   110,187   154,456
Year three 124,661   124,661   82,313
Year four 67,115   67,115   14,845
Year five 14,490   14,490   4,727
More than five years 8,850   8,850   4,438
Revolving 10,432   10,432   14,208
Revolving-Term 0   0   0
Total 367,687   367,687   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 77,648   77,648   270,129
Year two 250,347   250,347   262,606
Year three 232,655   232,655   207,611
Year four 185,121   185,121   88,018
Year five 81,831   81,831   99,574
More than five years 386,719   386,719   334,766
Revolving 92,819   92,819   96,754
Revolving-Term 1,845   1,845   1,307
Total 1,308,985   1,308,985   1,360,765
Year-to-date Gross Charge-offs          
Current fiscal year     0   0
Year two     0   67
Year three     0   43
Year four     0   1
Year five     6   88
More than five years     188   1,073
Revolving     0   34
Revolving-Term     0   0
Total 96 10 194 662 1,306
Commercial Loans | Pass | Commercial real estate          
Total Loan Balance          
Current fiscal year 48,148   48,148   276,677
Year two 278,373   278,373   323,463
Year three 372,544   372,544   433,308
Year four 445,786   445,786   237,901
Year five 220,620   220,620   383,799
More than five years 1,139,806   1,139,806   781,465
Revolving 30,627   30,627   32,418
Revolving-Term 0   0   0
Total 2,535,904   2,535,904   2,469,031
Commercial Loans | Pass | Commercial and industrial          
Total Loan Balance          
Current fiscal year 33,631   33,631   171,672
Year two 176,156   176,156   231,114
Year three 219,464   219,464   185,884
Year four 155,849   155,849   53,101
Year five 47,484   47,484   47,063
More than five years 220,218   220,218   183,165
Revolving 479,939   479,939   482,490
Revolving-Term 0   0   0
Total 1,332,741   1,332,741   1,354,489
Commercial Loans | Pass | Commercial construction          
Total Loan Balance          
Current fiscal year 31,952   31,952   75,596
Year two 110,187   110,187   154,456
Year three 124,661   124,661   82,313
Year four 67,115   67,115   14,845
Year five 14,490   14,490   151
More than five years 3,890   3,890   4,054
Revolving 10,432   10,432   14,208
Revolving-Term 0   0   0
Total 362,727   362,727   345,623
Commercial Loans | Pass | Business banking          
Total Loan Balance          
Current fiscal year 77,648   77,648   270,129
Year two 248,290   248,290   262,535
Year three 231,668   231,668   204,874
Year four 181,439   181,439   87,346
Year five 81,031   81,031   96,371
More than five years 372,885   372,885   321,360
Revolving 92,690   92,690   96,618
Revolving-Term 1,075   1,075   523
Total 1,286,726   1,286,726   1,339,756
Commercial Loans | Special mention | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   1,006
Year three 410   410   6,000
Year four 5,971   5,971   0
Year five 0   0   24,887
More than five years 65,786   65,786   75,428
Revolving 0   0   0
Revolving-Term 0   0   0
Total 72,167   72,167   107,321
Commercial Loans | Special mention | Commercial and industrial          
Total Loan Balance          
Current fiscal year 346   346   189
Year two 1,161   1,161   620
Year three 865   865   10,242
Year four 9,117   9,117   0
Year five 0   0   0
More than five years 10,585   10,585   8,848
Revolving 20,273   20,273   4,126
Revolving-Term 0   0   0
Total 42,347   42,347   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 150   150   55
Year three 52   52   251
Year four 64   64   224
Year five 286   286   33
More than five years 4,206   4,206   3,508
Revolving 25   25   37
Revolving-Term 280   280   172
Total 5,063   5,063   4,280
Commercial Loans | Substandard | Commercial real estate          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 0   0   0
Year three 994   994   0
Year four 0   0   2,355
Year five 2,306   2,306   10,685
More than five years 59,171   59,171   69,743
Revolving 0   0   0
Revolving-Term 0   0   0
Total 62,471   62,471   82,783
Commercial Loans | Substandard | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 51   51   244
Year three 213   213   14,510
Year four 13,646   13,646   1,595
Year five 1,404   1,404   5,795
More than five years 5,540   5,540   1,892
Revolving 24,376   24,376   33,633
Revolving-Term 0   0   0
Total 45,230   45,230   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 4,960   4,960   384
Revolving 0   0   0
Revolving-Term 0   0   0
Total 4,960   4,960   4,960
Commercial Loans | Substandard | Business banking          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 1,907   1,907   16
Year three 935   935   2,486
Year four 3,618   3,618   448
Year five 514   514   3,170
More than five years 9,628   9,628   9,898
Revolving 104   104   99
Revolving-Term 490   490   612
Total 17,196   17,196   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 1,985   1,985   0
Revolving 0   0   0
Revolving-Term 0   0   0
Total 1,985   1,985   0
Commercial Loans | Doubtful | Commercial and industrial          
Total Loan Balance          
Current fiscal year 0   0   0
Year two 79   79   0
Year three 0   0   0
Year four 208   208   0
Year five 0   0   0
More than five years 0   0   0
Revolving 1,350   1,350   0
Revolving-Term 0   0   0
Total 1,637   1,637   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 110,596   110,596   311,887
Year two 335,218   335,218   335,462
Year three 328,746   328,746   147,850
Year four 142,185   142,185   102,041
Year five 98,454   98,454   67,890
More than five years 245,129   245,129   189,794
Revolving 552,467   552,467   552,080
Revolving-Term 26,961   26,961   24,774
Total 1,839,756   1,839,756   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     23   43
Revolving     17   75
Revolving-Term     422   296
Total 332 40 471 117 421
Consumer Loans | Other consumer          
Total Loan Balance          
Current fiscal year 5,088   5,088   11,286
Year two 8,579   8,579   11,965
Year three 9,429   9,429   6,507
Year four 4,792   4,792   3,847
Year five 2,660   2,660   1,082
More than five years 968   968   672
Revolving 66,860   66,860   76,426
Revolving-Term 4,284   4,284   3,112
Total 102,660   102,660   114,897
Year-to-date Gross Charge-offs          
Current fiscal year     434   830
Year two     11   146
Year three     100   175
Year four     46   19
Year five     19   37
More than five years     12   5
Revolving     0   0
Revolving-Term     164   288
Total 417 $ 364 786 $ 682 1,500
Consumer Loans | Pass | Consumer real estate          
Total Loan Balance          
Current fiscal year 110,596   110,596   311,887
Year two 334,745   334,745   334,879
Year three 328,326   328,326   147,652
Year four 141,990   141,990   101,999
Year five 98,294   98,294   67,402
More than five years 240,448   240,448   183,283
Revolving 551,585   551,585   551,368
Revolving-Term 24,313   24,313   22,206
Total 1,830,297   1,830,297   1,720,676
Consumer Loans | Pass | Other consumer          
Total Loan Balance          
Current fiscal year 5,088   5,088   11,286
Year two 8,579   8,579   11,965
Year three 9,429   9,429   6,483
Year four 4,765   4,765   3,842
Year five 2,649   2,649   1,062
More than five years 807   807   526
Revolving 66,860   66,860   76,426
Revolving-Term 4,270   4,270   3,109
Total 102,447   102,447   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 106   106   189
Revolving 0   0   0
Revolving-Term 0   0   0
Total 106   106   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   0   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 420   420   198
Year four 195   195   42
Year five 160   160   488
More than five years 4,575   4,575   6,322
Revolving 882   882   712
Revolving-Term 2,648   2,648   2,568
Total 9,353   9,353   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 27   27   5
Year five 11   11   20
More than five years 161   161   146
Revolving 0   0   0
Revolving-Term 14   14   3
Total 213   213   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