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Loans (Credit Quality Indicators Vintage) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year $ 812,483   $ 812,483   $ 1,616,371
Term loans amortized cost, prior year 1,549,291   1,549,291   1,189,746
Term loans amortized cost, two years ago 1,168,253   1,168,253   532,413
Term loans amortized cost, three years ago 492,647   492,647   407,075
Term loans amortized cost, four years ago 377,633   377,633   341,778
Term loans amortized cost, five years ago or more 858,520   858,520   675,484
Revolving loans amortized cost 338,411   338,411   335,300
Revolving loans converted to term loans 13,877   13,877   11,972
Total 5,611,115   5,611,115   5,110,139
Gross charge-offs, current year     149    
Gross charge-offs, prior year     0    
Gross charge-offs, two years ago     8    
Gross charge-offs, three years ago     0    
Gross charge-offs, four years ago     0    
Gross charge-offs, five years ago or more     0    
Gross charge-offs, revolving loans     0    
Gross charge-offs, revolving loans converted to term loans     0    
Total gross charge-offs 44 $ 63 157 $ 122  
Commercial Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 318,524   318,524   612,175
Term loans amortized cost, prior year 583,256   583,256   405,386
Term loans amortized cost, two years ago 426,842   426,842   178,117
Term loans amortized cost, three years ago 177,458   177,458   194,529
Term loans amortized cost, four years ago 183,632   183,632   178,234
Term loans amortized cost, five years ago or more 361,448   361,448   253,037
Revolving loans amortized cost 11,100   11,100   6,389
Revolving loans converted to term loans 1,123   1,123   1,437
Total 2,063,383   2,063,383   1,829,304
Gross charge-offs, current year     0    
Gross charge-offs, prior year     0    
Gross charge-offs, two years ago     0    
Gross charge-offs, three years ago     0    
Gross charge-offs, four years ago     0    
Gross charge-offs, five years ago or more     0    
Gross charge-offs, revolving loans     0    
Gross charge-offs, revolving loans converted to term loans     0    
Total gross charge-offs 0 0 0 0  
Commercial Real Estate | Pass [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 302,233   302,233   591,596
Term loans amortized cost, prior year 583,256   583,256   383,062
Term loans amortized cost, two years ago 410,502   410,502   177,286
Term loans amortized cost, three years ago 177,443   177,443   170,259
Term loans amortized cost, four years ago 168,873   168,873   148,371
Term loans amortized cost, five years ago or more 336,078   336,078   242,061
Revolving loans amortized cost 11,100   11,100   6,243
Revolving loans converted to term loans 1,123   1,123   1,437
Total 1,990,608   1,990,608   1,720,315
Commercial Real Estate | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 2,328   2,328   20,579
Term loans amortized cost, prior year 0   0   22,324
Term loans amortized cost, two years ago 0   0   328
Term loans amortized cost, three years ago 15   15   24,270
Term loans amortized cost, four years ago 11,232   11,232   28,676
Term loans amortized cost, five years ago or more 16,724   16,724   10,564
Revolving loans amortized cost 0   0   146
Revolving loans converted to term loans 0   0   0
Total 30,299   30,299   106,887
Commercial Real Estate | Classified [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 13,963   13,963   0
Term loans amortized cost, prior year 0   0   0
Term loans amortized cost, two years ago 16,340   16,340   503
Term loans amortized cost, three years ago 0   0   0
Term loans amortized cost, four years ago 3,527   3,527   1,187
Term loans amortized cost, five years ago or more 8,646   8,646   412
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 42,476   42,476   2,102
Commercial & Industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 63,673   63,673   140,718
Term loans amortized cost, prior year 127,319   127,319   63,405
Term loans amortized cost, two years ago 54,883   54,883   71,265
Term loans amortized cost, three years ago 50,663   50,663   86,477
Term loans amortized cost, four years ago 75,587   75,587   86,438
Term loans amortized cost, five years ago or more 150,767   150,767   114,241
Revolving loans amortized cost 87,783   87,783   93,108
Revolving loans converted to term loans 890   890   745
Total 611,565   611,565   656,397
Gross charge-offs, current year [1]     25    
Gross charge-offs, prior year     0    
Gross charge-offs, two years ago     0    
Gross charge-offs, three years ago     0    
Gross charge-offs, four years ago     0    
Gross charge-offs, five years ago or more     0    
Gross charge-offs, revolving loans     0    
Gross charge-offs, revolving loans converted to term loans     0    
Total gross charge-offs 5 10 25 19  
Commercial & Industrial | Pass [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 52,415   52,415   127,152
Term loans amortized cost, prior year 127,319   127,319   63,180
Term loans amortized cost, two years ago 54,688   54,688   71,265
Term loans amortized cost, three years ago 50,663   50,663   86,470
Term loans amortized cost, four years ago 74,709   74,709   85,011
Term loans amortized cost, five years ago or more 150,767   150,767   114,241
Revolving loans amortized cost 87,783   87,783   90,987
Revolving loans converted to term loans 623   623   745
Total 598,967   598,967   639,051
Commercial & Industrial | Special Mention [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 11,258   11,258   13,566
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 182   182   1,427
Term loans amortized cost, five years ago or more 0   0   0
Revolving loans amortized cost 0   0   1,426
Revolving loans converted to term loans 267   267   0
Total 11,707   11,707   16,419
Commercial & Industrial | Classified [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   225
Term loans amortized cost, two years ago 195   195   0
Term loans amortized cost, three years ago 0   0   7
Term loans amortized cost, four years ago 696   696   0
Term loans amortized cost, five years ago or more 0   0   0
Revolving loans amortized cost 0   0   695
Revolving loans converted to term loans 0   0   0
Total 891   891   927
Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 403,050   403,050   838,566
Term loans amortized cost, prior year 819,106   819,106   708,360
Term loans amortized cost, two years ago 675,297   675,297   277,613
Term loans amortized cost, three years ago 260,458   260,458   123,364
Term loans amortized cost, four years ago 116,126   116,126   74,856
Term loans amortized cost, five years ago or more 337,063   337,063   300,243
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 2,611,100   2,611,100   2,323,002
Gross charge-offs, current year     0    
Gross charge-offs, prior year     0    
Gross charge-offs, two years ago     0    
Gross charge-offs, three years ago     0    
Gross charge-offs, four years ago     0    
Gross charge-offs, five years ago or more     0    
Gross charge-offs, revolving loans     0    
Gross charge-offs, revolving loans converted to term loans     0    
Total gross charge-offs 0 0 0 0  
Residential Real Estate | Current [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 403,050   403,050   838,566
Term loans amortized cost, prior year 819,106   819,106   707,760
Term loans amortized cost, two years ago 675,297   675,297   277,613
Term loans amortized cost, three years ago 259,565   259,565   123,098
Term loans amortized cost, four years ago 116,126   116,126   72,541
Term loans amortized cost, five years ago or more 330,171   330,171   294,549
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 2,603,315   2,603,315   2,314,127
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 0   0   600
Term loans amortized cost, two years ago 0   0   0
Term loans amortized cost, three years ago 893   893   266
Term loans amortized cost, four years ago 0   0   2,315
Term loans amortized cost, five years ago or more 6,892   6,892   5,694
Revolving loans amortized cost 0   0   0
Revolving loans converted to term loans 0   0   0
Total 7,785   7,785   8,875
Home Equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 21,023   21,023   20,665
Term loans amortized cost, prior year 15,936   15,936   8,308
Term loans amortized cost, two years ago 7,473   7,473   3,742
Term loans amortized cost, three years ago 3,023   3,023   2,406
Term loans amortized cost, four years ago 2,145   2,145   2,015
Term loans amortized cost, five years ago or more 4,935   4,935   3,237
Revolving loans amortized cost 239,284   239,284   235,552
Revolving loans converted to term loans 11,864   11,864   9,790
Total 305,683   305,683   285,715
Gross charge-offs, current year     0    
Gross charge-offs, prior year     0    
Gross charge-offs, two years ago     0    
Gross charge-offs, three years ago     0    
Gross charge-offs, four years ago     0    
Gross charge-offs, five years ago or more     0    
Gross charge-offs, revolving loans     0    
Gross charge-offs, revolving loans converted to term loans     0    
Total gross charge-offs 0 0 0 0  
Home Equity | Current [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 21,023   21,023   20,665
Term loans amortized cost, prior year 15,936   15,936   8,308
Term loans amortized cost, two years ago 7,473   7,473   3,742
Term loans amortized cost, three years ago 3,023   3,023   2,406
Term loans amortized cost, four years ago 2,145   2,145   1,947
Term loans amortized cost, five years ago or more 4,577   4,577   3,139
Revolving loans amortized cost 238,970   238,970   235,004
Revolving loans converted to term loans 10,611   10,611   9,268
Total 303,758   303,758   284,479
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 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   68
Term loans amortized cost, five years ago or more 358   358   98
Revolving loans amortized cost 314   314   548
Revolving loans converted to term loans 1,253   1,253   522
Total 1,925   1,925   1,236
Other          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 6,213   6,213   4,247
Term loans amortized cost, prior year 3,674   3,674   4,287
Term loans amortized cost, two years ago 3,758   3,758   1,676
Term loans amortized cost, three years ago 1,045   1,045   299
Term loans amortized cost, four years ago 143   143   235
Term loans amortized cost, five years ago or more 4,307   4,307   4,726
Revolving loans amortized cost 244   244   251
Revolving loans converted to term loans 0   0   0
Total 19,384   19,384   15,721
Gross charge-offs, current year [1]     124    
Gross charge-offs, prior year     0    
Gross charge-offs, two years ago     8    
Gross charge-offs, three years ago     0    
Gross charge-offs, four years ago     0    
Gross charge-offs, five years ago or more     0    
Gross charge-offs, revolving loans     0    
Gross charge-offs, revolving loans converted to term loans     0    
Total gross charge-offs 39 $ 53 132 $ 103  
Other | Current [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 6,197   6,197   4,231
Term loans amortized cost, prior year 3,674   3,674   4,287
Term loans amortized cost, two years ago 3,758   3,758   1,676
Term loans amortized cost, three years ago 1,045   1,045   299
Term loans amortized cost, four years ago 143   143   235
Term loans amortized cost, five years ago or more 4,307   4,307   4,726
Revolving loans amortized cost 241   241   251
Revolving loans converted to term loans 0   0   0
Total 19,365   19,365   15,705
Other | Past Due [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost, current year 16   16   16
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 0   0   0
Revolving loans amortized cost 3   3   0
Revolving loans converted to term loans 0   0   0
Total $ 19   $ 19   $ 16
[1] Gross charge-offs in 2023 represent charge-offs of business and consumer account overdraft balances.