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Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 $ 1,441,329 $ 1,825,140 $ 1,441,329 $ 1,825,140  
2022 2,050,229 2,677,047 2,050,229 2,677,047  
2021 2,307,121 2,247,195 2,307,121 2,247,195  
2020 1,942,598 1,690,252 1,942,598 1,690,252  
2019 1,483,856 841,526 1,483,856 841,526  
Prior 3,375,170 3,214,966 3,375,170 3,214,966  
Revolving Loans 1,746,588 1,722,920 1,746,588 1,722,920  
Revolving converted to Term 13,916 5,189 13,916 5,189  
Total loans 14,360,807 [1]   14,360,807 [1]   $ 14,278,070
Total loans 14,360,807 14,224,235 14,360,807 14,224,235 14,278,070
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     2,461 1,836  
2023     0 5,072  
2022     28 22  
2021     0 37  
2020     0 0  
Prior     0 41  
Revolving Loans     6,206 23,592  
Revolving converted to Term     0 0  
Total 7,006 6,018 8,695 30,600  
Commercial And Industrial [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 296,851 312,282 296,851 312,282  
2022 189,042 195,683 189,042 195,683  
2021 134,661 96,402 134,661 96,402  
2020 62,479 83,776 62,479 83,776  
2019 41,639 46,996 41,639 46,996  
Prior 129,772 116,990 129,772 116,990  
Revolving Loans 723,417 800,874 723,417 800,874  
Revolving converted to Term 0 0 0 0  
Total loans 1,577,861 [1]   1,577,861 [1]   1,579,986
Total loans 1,577,861 1,653,003 [1] 1,577,861 1,653,003 [1] 1,579,986
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     0 0  
2023     0 0  
2022     0 0  
2021     0 0  
2020     0 0  
Prior     0 34  
Revolving Loans     5,886 23,437  
Revolving converted to Term     0 0  
Total 5,886 0 5,886 23,471  
Commercial And Industrial [Member] | Pass [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 [2] 282,973 303,838 282,973 303,838  
2022 [2] 188,687 188,559 188,687 188,559  
2021 [2] 133,680 94,714 133,680 94,714  
2020 [2] 61,678 73,366 61,678 73,366  
2019 [2] 41,639 45,741 41,639 45,741  
Prior [2] 129,637 116,052 129,637 116,052  
Revolving Loans [2] 682,099 737,335 682,099 737,335  
Revolving converted to Term [2] 0 0 0 0  
Total loans [1],[2] 1,520,393   1,520,393    
Total loans [1],[2]   1,559,605   1,559,605  
Commercial And Industrial [Member] | Potential Weakness [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 11,775 6,511 11,775 6,511  
2022 194 2,417 194 2,417  
2021 946 614 946 614  
2020 346 10,278 346 10,278  
2019 0 90 0 90  
Prior 113 132 113 132  
Revolving Loans 4,702 46,706 4,702 46,706  
Revolving converted to Term 0 0 0 0  
Total loans [1] 18,076   18,076    
Total loans [1]   66,748   66,748  
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 2,103 1,933 2,103 1,933  
2022 161 4,707 161 4,707  
2021 35 1,074 35 1,074  
2020 455 132 455 132  
2019 0 1,165 0 1,165  
Prior 22 806 22 806  
Revolving Loans 24,964 16,833 24,964 16,833  
Revolving converted to Term 0 0 0 0  
Total loans [1] 27,740   27,740    
Total loans [1]   26,650   26,650  
Commercial And Industrial [Member] | Partial Loss Probable [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 11,652 0 11,652 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 11,652   11,652    
Total loans [1]   0   0  
Commercial And Industrial [Member] | Definite Loss [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 0   0    
Total loans [1]   0   0  
Commercial Real Estate [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 784,395 889,069 784,395 889,069  
2022 1,127,784 1,225,696 1,127,784 1,225,696  
2021 1,234,006 1,420,347 1,234,006 1,420,347  
2020 1,310,083 1,331,223 1,310,083 1,331,223  
2019 1,194,771 632,165 1,194,771 632,165  
Prior 2,413,043 2,328,376 2,413,043 2,328,376  
Revolving Loans 96,822 68,496 96,822 68,496  
Revolving converted to Term 1,116 858 1,116 858  
Total loans 8,162,020 [1]   8,162,020 [1]   8,041,508
Total loans 8,162,020 7,896,230 [1] 8,162,020 7,896,230 [1] 8,041,508
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     0 0  
2023     0 5,072  
2022     0 0  
2021     0 0  
2020     0 0  
Prior     0 0  
Revolving Loans     0 0  
Revolving converted to Term     0 0  
Total 0 5,072 0 5,072  
Commercial Real Estate [Member] | Pass [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 744,344 795,830 744,344 795,830  
2022 1,053,780 1,160,497 1,053,780 1,160,497  
2021 1,179,121 1,338,792 1,179,121 1,338,792  
2020 1,256,074 1,312,240 1,256,074 1,312,240  
2019 1,151,010 610,009 1,151,010 610,009  
Prior 2,298,419 2,188,221 2,298,419 2,188,221  
Revolving Loans 96,822 68,496 96,822 68,496  
Revolving converted to Term 1,116 858 1,116 858  
Total loans [1] 7,780,686   7,780,686    
Total loans [1]   7,474,943   7,474,943  
Commercial Real Estate [Member] | Potential Weakness [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 7,442 62,572 7,442 62,572  
2022 6,350 37,695 6,350 37,695  
2021 29,443 57,987 29,443 57,987  
2020 13,085 14,662 13,085 14,662  
2019 12,691 2,945 12,691 2,945  
Prior 101,133 118,830 101,133 118,830  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 170,144   170,144    
Total loans [1]   294,691   294,691  
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 32,609 30,667 32,609 30,667  
2022 13,017 27,504 13,017 27,504  
2021 25,442 23,568 25,442 23,568  
2020 29,264 4,321 29,264 4,321  
2019 31,070 19,211 31,070 19,211  
Prior 6,076 21,325 6,076 21,325  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 137,478   137,478    
Total loans [1]   126,596   126,596  
Commercial Real Estate [Member] | Partial Loss Probable [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 54,637 0 54,637 0  
2021 0 0 0 0  
2020 11,660 0 11,660 0  
2019 0 0 0 0  
Prior 7,415 0 7,415 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 73,712   73,712    
Total loans [1]   0   0  
Commercial Real Estate [Member] | Definite Loss [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 0   0    
Total loans [1]   0   0  
Construction Loans [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 171,546 169,202 171,546 169,202  
2022 178,721 517,297 178,721 517,297  
2021 242,958 222,883 242,958 222,883  
2020 95,919 9,939 95,919 9,939  
2019 0 27,304 0 27,304  
Prior 24,783 1,569 24,783 1,569  
Revolving Loans 27,213 17,248 27,213 17,248  
Revolving converted to Term 902 0 902 0  
Total loans 742,042 [1]   742,042 [1]   849,586
Total loans 742,042 965,442 [1] 742,042 965,442 [1] 849,586
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     0 0  
2023     0 0  
2022     0 0  
2021     0 0  
2020     0 0  
Prior     0 0  
Revolving Loans     0 0  
Revolving converted to Term     0 0  
Total 0 0 0 0  
Construction Loans [Member] | Pass [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 140,421 146,278 140,421 146,278  
2022 176,796 491,098 176,796 491,098  
2021 218,298 201,730 218,298 201,730  
2020 89,854 9,939 89,854 9,939  
2019 0 27,304 0 27,304  
Prior 24,783 1,569 24,783 1,569  
Revolving Loans 27,213 17,248 27,213 17,248  
Revolving converted to Term 902 0 902 0  
Total loans [1] 678,267   678,267    
Total loans [1]   895,166   895,166  
Construction Loans [Member] | Potential Weakness [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 13,484 0 13,484  
2022 1,925 0 1,925 0  
2021 15,540 4,823 15,540 4,823  
2020 6,065 0 6,065 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 23,530   23,530    
Total loans [1]   18,307   18,307  
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 31,125 9,440 31,125 9,440  
2022 0 26,199 0 26,199  
2021 9,120 16,330 9,120 16,330  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 40,245   40,245    
Total loans [1]   51,969   51,969  
Construction Loans [Member] | Partial Loss Probable [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 0   0    
Total loans [1]   0   0  
Construction Loans [Member] | Definite Loss [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 0   0    
Total loans [1]   0   0  
Small Business [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 39,076 40,980 39,076 40,980  
2022 46,427 53,207 46,427 53,207  
2021 45,450 40,832 45,450 40,832  
2020 34,680 27,209 34,680 27,209  
2019 22,949 13,759 22,949 13,759  
Prior 29,971 24,259 29,971 24,259  
Revolving Loans 51,414 45,089 51,414 45,089  
Revolving converted to Term 51 0 51 0  
Total loans 270,018 [1]   270,018 [1]   251,956
Total loans 270,018 245,335 [1] 270,018 245,335 [1] 251,956
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     48 0  
2023     0 0  
2022     28 22  
2021     0 37  
2020     0 0  
Prior     0 0  
Revolving Loans     256 140  
Revolving converted to Term     0 0  
Total 163 112 332 199  
Small Business [Member] | Pass [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 38,687 40,551 38,687 40,551  
2022 45,927 52,883 45,927 52,883  
2021 45,358 40,706 45,358 40,706  
2020 34,503 26,759 34,503 26,759  
2019 22,766 13,759 22,766 13,759  
Prior 29,356 23,458 29,356 23,458  
Revolving Loans 50,009 43,759 50,009 43,759  
Revolving converted to Term 51 0 51 0  
Total loans [1] 266,657   266,657    
Total loans [1]   241,875   241,875  
Small Business [Member] | Potential Weakness [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 104 0 104 0  
2021 27 0 27 0  
2020 174 155 174 155  
2019 0 0 0 0  
Prior 224 186 224 186  
Revolving Loans 784 295 784 295  
Revolving converted to Term 0 0 0 0  
Total loans [1] 1,313   1,313    
Total loans [1]   636   636  
Small Business [Member] | Definite Weakness Loss Unlikely [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 389 429 389 429  
2022 396 324 396 324  
2021 65 126 65 126  
2020 3 295 3 295  
2019 183 0 183 0  
Prior 391 615 391 615  
Revolving Loans 621 1,035 621 1,035  
Revolving converted to Term 0 0 0 0  
Total loans [1] 2,048   2,048    
Total loans [1]   2,824   2,824  
Small Business [Member] | Partial Loss Probable [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 0   0    
Total loans [1]   0   0  
Small Business [Member] | Definite Loss [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 0 0 0 0  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 0   0    
Total loans [1]   0   0  
Residential Real Estate [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 134,868 391,340 134,868 391,340  
2022 482,493 645,593 482,493 645,593  
2021 615,795 409,145 615,795 409,145  
2020 387,786 186,469 387,786 186,469  
2019 177,583 90,853 177,583 90,853  
Prior 643,334 614,702 643,334 614,702  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans 2,441,859 [1]   2,441,859 [1]   2,424,754
Total loans 2,441,859 2,338,102 [1] 2,441,859 2,338,102 [1] 2,424,754
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     0 0  
2023     0 0  
2022     0 0  
2021     0 0  
2020     0 0  
Prior     0 0  
Revolving Loans     0 0  
Revolving converted to Term     0 0  
Total 0 0 0 0  
Residential Real Estate [Member] | Pass [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 134,868 391,121 134,868 391,121  
2022 482,280 645,593 482,280 645,593  
2021 615,795 408,752 615,795 408,752  
2020 387,127 186,334 387,127 186,334  
2019 177,583 89,911 177,583 89,911  
Prior 640,992 612,878 640,992 612,878  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 2,438,645   2,438,645    
Total loans [1]   2,334,589   2,334,589  
Residential Real Estate [Member] | Default [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 219 0 219  
2022 213 0 213 0  
2021 0 393 0 393  
2020 659 135 659 135  
2019 0 942 0 942  
Prior 2,342 1,824 2,342 1,824  
Revolving Loans 0 0 0 0  
Revolving converted to Term 0 0 0 0  
Total loans [1] 3,214   3,214    
Total loans [1]   3,513   3,513  
Home Equity Loan [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 14,034 21,729 14,034 21,729  
2022 25,276 39,251 25,276 39,251  
2021 34,092 56,216 34,092 56,216  
2020 50,948 50,724 50,948 50,724  
2019 46,614 30,039 46,614 30,039  
Prior 132,974 126,897 132,974 126,897  
Revolving Loans 814,650 766,368 814,650 766,368  
Revolving converted to Term 11,847 4,331 11,847 4,331  
Total loans [1] 1,130,435   1,130,435    
Total loans 1,130,435 1,095,555 [1] 1,130,435 1,095,555 [1] $ 1,097,626
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     0 0  
2023     0 0  
2022     0 0  
2021     0 0  
2020     0 0  
Prior     0 0  
Revolving Loans     49 0  
Revolving converted to Term     0 0  
Total 38 0 49 0  
Home Equity Loan [Member] | Pass [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 14,034 21,729 14,034 21,729  
2022 25,276 39,251 25,276 39,251  
2021 34,092 56,216 34,092 56,216  
2020 50,948 50,724 50,948 50,724  
2019 46,614 30,039 46,614 30,039  
Prior 132,804 126,897 132,804 126,897  
Revolving Loans 813,118 765,079 813,118 765,079  
Revolving converted to Term 11,612 4,190 11,612 4,190  
Total loans [1] 1,128,498   1,128,498    
Total loans [1]   1,094,125   1,094,125  
Home Equity Loan [Member] | Default [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 170 0 170 0  
Revolving Loans 1,532 1,289 1,532 1,289  
Revolving converted to Term 235 141 235 141  
Total loans [1] 1,937   1,937    
Total loans [1]   1,430   1,430  
Consumer Loan [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 559 538 559 538  
2022 486 320 486 320  
2021 159 1,370 159 1,370  
2020 703 912 703 912  
2019 300 410 300 410  
Prior 1,293 2,173 1,293 2,173  
Revolving Loans 33,072 24,845 33,072 24,845  
Revolving converted to Term 0 0 0 0  
Total loans [1] 36,572   36,572    
Total loans [1]   30,568   30,568  
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
2024     2,413 1,836  
2023     0 0  
2022     0 0  
2021     0 0  
2020     0 0  
Prior     0 7  
Revolving Loans     15 15  
Revolving converted to Term     0 0  
Total     2,428 1,858  
Consumer Loan [Member] | Pass [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 559 538 559 538  
2022 486 320 486 320  
2021 159 1,370 159 1,370  
2020 703 912 703 912  
2019 300 410 300 410  
Prior 1,279 2,154 1,279 2,154  
Revolving Loans 33,071 24,843 33,071 24,843  
Revolving converted to Term 0 0 0 0  
Total loans [1] 36,557   36,557    
Total loans [1]   30,547   30,547  
Consumer Loan [Member] | Default [Member]          
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]          
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
2019 0 0 0 0  
Prior 14 19 14 19  
Revolving Loans 1 2 1 2  
Revolving converted to Term 0 0 0 0  
Total loans [1] $ 15   $ 15    
Total loans [1]   $ 21   $ 21  
[1] Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.
[2] Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances and the associated gross write-offs.