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Loans, Allowance for Credit Losses and Credit Quality (Tables) | 3 Months Ended
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Mar. 31, 2024
Receivables [Abstract] |
Financing Receivable, Allowance for Credit Loss [Table Text Block] | The following table summarizes the change in allowance for credit losses by loan category, and bifurcates the amount of loans allocated to each loan category for the period indicated:
| Three Months Ended March 31, 2024
| (Dollars in thousands)
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total
Allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 19,243 |  |  | $ | 74,148 |  |  | $ | 7,683 |  |  | $ | 3,963 |  |  | $ | 23,637 |  |  | $ | 12,797 |  |  | $ | 751 |  |  | $ | 142,222 |
Charge-offs | — |  |  | — |  |  | — |  |  | (109) |  |  | — |  |  | — |  |  | (772) |  |  | (881) |
Recoveries | 85 |  |  | — |  |  | — |  |  | 39 |  |  | — |  |  | 133 |  |  | 350 |  |  | 607 |
Provision for (release of) credit losses | 1,161 |  |  | 3,781 |  |  | (110) |  |  | 135 |  |  | 543 |  |  | (888) |  |  | 378 |  |  | 5,000 |
Ending balance (1) | $ | 20,489 |  |  | $ | 77,929 |  |  | $ | 7,573 |  |  | $ | 4,028 |  |  | $ | 24,180 |  |  | $ | 12,042 |  |  | $ | 707 |  |  | $ | 146,948 |
| Three Months Ended March 31, 2023
| (Dollars in thousands)
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total
Allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 27,559 |  |  | $ | 77,799 |  |  | $ | 10,762 |  |  | $ | 2,834 |  |  | $ | 20,973 |  |  | $ | 11,504 |  |  | $ | 988 |  |  | $ | 152,419 |
Charge-offs | (281) |  |  | — |  |  | — |  |  | (28) |  |  | — |  |  | — |  |  | (506) |  |  | (815) |
Recoveries | 5 |  |  | — |  |  | — |  |  | 31 |  |  | — |  |  | 16 |  |  | 225 |  |  | 277 |
Provision for (release of) credit losses | 9,649 |  |  | (1,601) |  |  | (1,514) |  |  | 501 |  |  | (519) |  |  | 908 |  |  | (174) |  |  | 7,250 |
Ending balance (1) | $ | 36,932 |  |  | $ | 76,198 |  |  | $ | 9,248 |  |  | $ | 3,338 |  |  | $ | 20,454 |  |  | $ | 12,428 |  |  | $ | 533 |  |  | $ | 159,131 |
(1)Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $59.3 million and $52.7 million as of March 31, 2024 and March 31, 2023, respectively.
Financing Receivable Credit Quality Indicators [Table Text Block] | The following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year as of the dates indicated below:
| March 31, 2024
| 2024 |  | 2023 |  | 2022 |  | 2021 |  | 2020 |  | Prior |  | Revolving Loans |  | Revolving converted to Term |  | Total (1)
| (Dollars in thousands)
Commercial and industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 159,082 |  |  | $ | 223,301 |  |  | $ | 148,288 |  |  | $ | 73,012 |  |  | $ | 60,865 |  |  | $ | 146,495 |  |  | $ | 685,258 |  |  | $ | — |  |  | $ | 1,496,301 |
Special mention | 3,160 |  |  | 3,254 |  |  | 1,843 |  |  | 322 |  |  | 9,206 |  |  | 4,024 |  |  | 31,525 |  |  | — |  |  | 53,334 |
Substandard | 1,809 |  |  | — |  |  | 57 |  |  | 198 |  |  | — |  |  | 43 |  |  | 28,299 |  |  | — |  |  | 30,406 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial and industrial | $ | 164,051 |  |  | $ | 226,555 |  |  | $ | 150,188 |  |  | $ | 73,532 |  |  | $ | 70,071 |  |  | $ | 150,562 |  |  | $ | 745,082 |  |  | $ | — |  |  | $ | 1,580,041 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commercial real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 193,152 |  |  | $ | 1,127,417 |  |  | $ | 1,201,044 |  |  | $ | 1,304,867 |  |  | $ | 1,212,201 |  |  | $ | 2,562,542 |  |  | $ | 93,048 |  |  | $ | 248 |  |  | $ | 7,694,519 |
Special mention | — |  |  | 61,943 |  |  | 38,590 |  |  | 53,837 |  |  | 44,806 |  |  | 124,614 |  |  | 297 |  |  | — |  |  | 324,087 |
Substandard | 6,350 |  |  | 27,358 |  |  | 18,046 |  |  | 22,758 |  |  | 3,894 |  |  | 3,973 |  |  | — |  |  | — |  |  | 82,379 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,851 |  |  | — |  |  | — |  |  | 7,851 |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial real estate | $ | 199,502 |  |  | $ | 1,216,718 |  |  | $ | 1,257,680 |  |  | $ | 1,381,462 |  |  | $ | 1,260,901 |  |  | $ | 2,698,980 |  |  | $ | 93,345 |  |  | $ | 248 |  |  | $ | 8,108,836 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commercial construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 97,558 |  |  | $ | 164,784 |  |  | $ | 336,768 |  |  | $ | 100,371 |  |  | $ | 7,971 |  |  | $ | 25,184 |  |  | $ | 19,398 |  |  | $ | 676 |  |  | $ | 752,710 |
Special mention | 3,326 |  |  | 18,724 |  |  | — |  |  | 5,618 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 27,668 |
Substandard | 10,585 |  |  | — |  |  | 18,601 |  |  | 19,336 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 48,522 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial construction | $ | 111,469 |  |  | $ | 183,508 |  |  | $ | 355,369 |  |  | $ | 125,325 |  |  | $ | 7,971 |  |  | $ | 25,184 |  |  | $ | 19,398 |  |  | $ | 676 |  |  | $ | 828,900 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Small business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 14,707 |  |  | $ | 49,885 |  |  | $ | 48,880 |  |  | $ | 37,682 |  |  | $ | 23,538 |  |  | $ | 33,246 |  |  | $ | 49,943 |  |  | $ | — |  |  | $ | 257,881 |
Special mention | — |  |  | 59 |  |  | 5 |  |  | 75 |  |  | 152 |  |  | 182 |  |  | 481 |  |  | — |  |  | 954 |
Substandard | 180 |  |  | 520 |  |  | 224 |  |  | 87 |  |  | 461 |  |  | 658 |  |  | 725 |  |  | — |  |  | 2,855 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total small business | $ | 14,887 |  |  | $ | 50,464 |  |  | $ | 49,109 |  |  | $ | 37,844 |  |  | $ | 24,151 |  |  | $ | 34,086 |  |  | $ | 51,149 |  |  | $ | — |  |  | $ | 261,690 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | 28 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 81 |  |  | $ | — |  |  | $ | 109 |
Residential real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 29,922 |  |  | $ | 497,477 |  |  | $ | 633,135 |  |  | $ | 399,440 |  |  | $ | 183,544 |  |  | $ | 674,298 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,417,816 |
Default | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,889 |  |  | — |  |  | — |  |  | 2,889 |
Total residential real estate | $ | 29,922 |  |  | $ | 497,477 |  |  | $ | 633,135 |  |  | $ | 399,440 |  |  | $ | 183,544 |  |  | $ | 677,187 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,420,705 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Home equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 4,208 |  |  | $ | 27,517 |  |  | $ | 37,162 |  |  | $ | 54,001 |  |  | $ | 48,389 |  |  | $ | 145,029 |  |  | $ | 778,842 |  |  | $ | 3,736 |  |  | $ | 1,098,884 |
Default | — |  |  | — |  |  | 83 |  |  | — |  |  | — |  |  | 170 |  |  | 1,214 |  |  | 235 |  |  | 1,702 |
Total home equity | $ | 4,208 |  |  | $ | 27,517 |  |  | $ | 37,245 |  |  | $ | 54,001 |  |  | $ | 48,389 |  |  | $ | 145,199 |  |  | $ | 780,056 |  |  | $ | 3,971 |  |  | $ | 1,100,586 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Other consumer (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 66 |  |  | $ | 586 |  |  | $ | 216 |  |  | $ | 981 |  |  | $ | 539 |  |  | $ | 1,725 |  |  | $ | 25,723 |  |  | $ | — |  |  | $ | 29,836 |
Default | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total other consumer | $ | 66 |  |  | $ | 586 |  |  | $ | 216 |  |  | $ | 981 |  |  | $ | 539 |  |  | $ | 1,725 |  |  | $ | 25,723 |  |  | $ | — |  |  | $ | 29,836 |
Current-period gross write-offs | $ | 763 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | 772 |
Total | $ | 524,105 |  |  | $ | 2,202,825 |  |  | $ | 2,482,942 |  |  | $ | 2,072,585 |  |  | $ | 1,595,566 |  |  | $ | 3,732,923 |  |  | $ | 1,714,753 |  |  | $ | 4,895 |  |  | $ | 14,330,594 |
Total current-period gross write-offs | $ | 763 |  |  | $ | — |  |  | $ | 28 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 90 |  |  | $ | — |  |  | $ | 881 |
| March 31, 2023
| 2022 |  | 2021 |  | 2020 |  | 2019 |  | 2018 |  | Prior |  | Revolving Loans |  | Revolving converted to Term |  | Total (1)
| (Dollars in thousands)
Commercial and industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 153,554 |  |  | $ | 262,933 |  |  | $ | 122,770 |  |  | $ | 94,702 |  |  | $ | 54,925 |  |  | $ | 85,391 |  |  | $ | 811,795 |  |  | $ | — |  |  | $ | 1,586,070 |
Special mention | — |  |  | 4,712 |  |  | 705 |  |  | 868 |  |  | 1,608 |  |  | 1,342 |  |  | 24,114 |  |  | — |  |  | 33,349 |
Substandard | — |  |  | 2,295 |  |  | 1,516 |  |  | 164 |  |  | 377 |  |  | 1 |  |  | 2,936 |  |  | — |  |  | 7,289 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 23,174 |  |  | — |  |  | 23,174 |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial and industrial | $ | 153,554 |  |  | $ | 269,940 |  |  | $ | 124,991 |  |  | $ | 95,734 |  |  | $ | 56,910 |  |  | $ | 86,734 |  |  | $ | 862,019 |  |  | $ | — |  |  | $ | 1,649,882 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 34 |  |  | $ | 247 |  |  | $ | — |  |  | $ | 281 |
Commercial real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 204,462 |  |  | $ | 1,199,328 |  |  | $ | 1,459,526 |  |  | $ | 1,259,511 |  |  | $ | 720,208 |  |  | $ | 2,439,424 |  |  | $ | 59,810 |  |  | $ | — |  |  | $ | 7,342,269 |
Special mention | 154 |  |  | 52,961 |  |  | 67,200 |  |  | 29,611 |  |  | 13,139 |  |  | 225,673 |  |  | — |  |  | — |  |  | 388,738 |
Substandard | 3,481 |  |  | 39,208 |  |  | 13,205 |  |  | 5,334 |  |  | 4,038 |  |  | 23,821 |  |  | — |  |  | — |  |  | 89,087 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial real estate | $ | 208,097 |  |  | $ | 1,291,497 |  |  | $ | 1,539,931 |  |  | $ | 1,294,456 |  |  | $ | 737,385 |  |  | $ | 2,688,918 |  |  | $ | 59,810 |  |  | $ | — |  |  | $ | 7,820,094 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commercial construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 90,362 |  |  | $ | 461,824 |  |  | $ | 266,758 |  |  | $ | 89,919 |  |  | $ | 62,033 |  |  | $ | 4,755 |  |  | $ | 21,237 |  |  | $ | — |  |  | $ | 996,888 |
Special mention | 18,431 |  |  | — |  |  | 5,889 |  |  | 3,919 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 28,239 |
Substandard | 7,619 |  |  | 11,434 |  |  | 2,130 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21,183 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial construction | $ | 116,412 |  |  | $ | 473,258 |  |  | $ | 274,777 |  |  | $ | 93,838 |  |  | $ | 62,033 |  |  | $ | 4,755 |  |  | $ | 21,237 |  |  | $ | — |  |  | $ | 1,046,310 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Small business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 9,770 |  |  | $ | 54,258 |  |  | $ | 43,458 |  |  | $ | 29,810 |  |  | $ | 16,173 |  |  | $ | 26,536 |  |  | $ | 42,746 |  |  | $ | — |  |  | $ | 222,751 |
Special mention | — |  |  | — |  |  | — |  |  | 158 |  |  | — |  |  | 228 |  |  | 527 |  |  | — |  |  | 913 |
Substandard | 105 |  |  | 126 |  |  | 113 |  |  | 304 |  |  | 3 |  |  | 686 |  |  | 865 |  |  | — |  |  | 2,202 |
Doubtful | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total small business | $ | 9,875 |  |  | $ | 54,384 |  |  | $ | 43,571 |  |  | $ | 30,272 |  |  | $ | 16,176 |  |  | $ | 27,450 |  |  | $ | 44,138 |  |  | $ | — |  |  | $ | 225,866 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 28 |  |  | $ | — |  |  | $ | 28 |
Residential real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 91,404 |  |  | $ | 658,273 |  |  | $ | 416,067 |  |  | $ | 190,313 |  |  | $ | 92,927 |  |  | $ | 644,659 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,093,643 |
Default | — |  |  | — |  |  | — |  |  | 472 |  |  | 157 |  |  | 1,372 |  |  | — |  |  | — |  |  | 2,001 |
Total residential real estate | $ | 91,404 |  |  | $ | 658,273 |  |  | $ | 416,067 |  |  | $ | 190,785 |  |  | $ | 93,084 |  |  | $ | 646,031 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,095,644 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Home equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 6,812 |  |  | $ | 42,352 |  |  | $ | 58,830 |  |  | $ | 53,565 |  |  | $ | 31,341 |  |  | $ | 139,472 |  |  | $ | 756,103 |  |  | $ | 937 |  |  | $ | 1,089,412 |
Default | — |  |  | — |  |  | — |  |  | — |  |  | 122 |  |  | 82 |  |  | 1,139 |  |  | — |  |  | 1,343 |
Total home equity | $ | 6,812 |  |  | $ | 42,352 |  |  | $ | 58,830 |  |  | $ | 53,565 |  |  | $ | 31,463 |  |  | $ | 139,554 |  |  | $ | 757,242 |  |  | $ | 937 |  |  | $ | 1,090,755 |
Current-period gross write-offs | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Other consumer (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass | $ | 60 |  |  | $ | 386 |  |  | $ | 1,168 |  |  | $ | 926 |  |  | $ | 514 |  |  | $ | 1,852 |  |  | $ | 14,450 |  |  | $ | — |  |  | $ | 19,356 |
Default | — |  |  | — |  |  | — |  |  | — |  |  | 6 |  |  | 37 |  |  | 2 |  |  | — |  |  | 45 |
Total other consumer | $ | 60 |  |  | $ | 386 |  |  | $ | 1,168 |  |  | $ | 926 |  |  | $ | 520 |  |  | $ | 1,889 |  |  | $ | 14,452 |  |  | $ | — |  |  | $ | 19,401 |
Current-period gross write-offs | $ | 498 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |  |  | $ | — |  |  | $ | 506 |
Total | $ | 586,214 |  |  | $ | 2,790,090 |  |  | $ | 2,459,335 |  |  | $ | 1,759,576 |  |  | $ | 997,571 |  |  | $ | 3,595,331 |  |  | $ | 1,758,898 |  |  | $ | 937 |  |  | $ | 13,947,952 |
Total current -period gross write-offs | $ | 498 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 34 |  |  | $ | 283 |  |  | $ | — |  |  | $ | 815 |
(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.
Foreclosed Residential Real Estate Property [Table Text Block] | The following table shows information regarding foreclosed residential real estate property at the dates indicated:
| March 31, 2024 |  | December 31, 2023
| (Dollars in thousands)
Foreclosed residential real estate property held by the creditor | $ | 110 |  |  | $ | 110 |
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure | $ | 1,900 |  |  | $ | 1,697 |
Financing Receivable Credit Quality Indicators For Consumer And Residential Portfolio Table Text Block | The following table shows the weighted average FICO scores and the weighted average combined LTV ratios at the dates indicated below:
| March 31 2024 |  | December 31 2023
Residential real estate portfolio |  |  |
FICO score (re-scored)(1) | 755 |  |  | 754 |
LTV (re-valued)(2) | 59.7 | % |  | 59.8 | %
Home equity portfolio |  |  |
FICO score (re-scored)(1) | 770 |  |  | 770 |
LTV (re-valued)(2)(3) | 43.9 | % |  | 43.3 | %
(1)The average FICO scores at March 31, 2024 are based upon rescores from March 2024 as available for previously originated loans, or origination score data for loans booked in March 2024. The average FICO scores at December 31, 2023 were based upon rescores available from December 2023, as available for previously originated loans, or origination score data for loans booked in December 2023. (2)The combined LTV ratios for March 31, 2024 are based upon updated automated valuations as of February 2024, when available, and/or the most current valuation data available. The combined LTV ratios for December 31, 2023 were based upon updated automated valuations as of November 2023, when available, and/or the most current valuation data available as of such date. The updated automated valuations provide new information on loans that may be available since the previous valuation was obtained. If no new information is available, the valuation will default to the previously obtained data or most recent appraisal. (3)For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.
Financing Receivable, Past Due [Table Text Block] | The following tables show the age analysis of past due financing receivables as of the dates indicated:
| March 31, 2024
| 30-59 days |  | 60-89 days |  | 90 days or more |  | Total Past Due |  |  |  | Total Financing Receivables (2) |  | Amortized Cost >90 Days and Accruing
| Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Current |
| (Dollars in thousands)
Loan Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial and industrial | 8 |  |  | $ | 743 |  |  | 2 |  |  | $ | 85 |  |  | 2 |  |  | $ | 17,555 |  |  | 12 |  |  | $ | 18,383 |  |  | $ | 1,561,658 |  |  | $ | 1,580,041 |  |  | $ | — |
Commercial real estate | 10 |  |  | 20,582 |  |  | — |  |  | — |  |  | 5 |  |  | 24,056 |  |  | 15 |  |  | 44,638 |  |  | 8,064,198 |  |  | 8,108,836 |  |  | — |
Commercial construction | 1 |  |  | 1,019 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 1,019 |  |  | 827,881 |  |  | 828,900 |  |  | — |
Small business | 17 |  |  | 539 |  |  | 6 |  |  | 321 |  |  | 1 |  |  | 5 |  |  | 24 |  |  | 865 |  |  | 260,825 |  |  | 261,690 |  |  | — |
Residential real estate | 14 |  |  | 3,482 |  |  | 3 |  |  | 248 |  |  | 16 |  |  | 2,641 |  |  | 33 |  |  | 6,371 |  |  | 2,414,334 |  |  | 2,420,705 |  |  | — |
Home equity | 17 |  |  | 1,200 |  |  | 3 |  |  | 89 |  |  | 15 |  |  | 1,702 |  |  | 35 |  |  | 2,991 |  |  | 1,097,595 |  |  | 1,100,586 |  |  | — |
Other consumer (1) | 415 |  |  | 238 |  |  | 14 |  |  | 31 |  |  | — |  |  | — |  |  | 429 |  |  | 269 |  |  | 29,567 |  |  | 29,836 |  |  | — |
Total | 482 |  |  | $ | 27,803 |  |  | 28 |  |  | $ | 774 |  |  | 39 |  |  | $ | 45,959 |  |  | 549 |  |  | $ | 74,536 |  |  | $ | 14,256,058 |  |  | $ | 14,330,594 |  |  | $ | — |
| December 31, 2023
| 30-59 days |  | 60-89 days |  | 90 days or more |  | Total Past Due |  |  |  | Total Financing Receivables (2) |  | Amortized Cost >90 Days and Accruing
| Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Current |
| (Dollars in thousands)
Loan Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial and industrial | 6 |  |  | $ | 398 |  |  | 1 |  |  | $ | 17,538 |  |  | 2 |  |  | $ | 673 |  |  | 9 |  |  | $ | 18,609 |  |  | $ | 1,561,377 |  |  | $ | 1,579,986 |  |  | $ | — |
Commercial real estate | 8 |  |  | 14,674 |  |  | 2 |  |  | 8,419 |  |  | 3 |  |  | 7,279 |  |  | 13 |  |  | 30,372 |  |  | 8,011,136 |  |  | 8,041,508 |  |  | — |
Commercial construction | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 849,586 |  |  | 849,586 |  |  | — |
Small business | 6 |  |  | 400 |  |  | 1 |  |  | 20 |  |  | 6 |  |  | 243 |  |  | 13 |  |  | 663 |  |  | 251,293 |  |  | 251,956 |  |  | — |
Residential real estate | 24 |  |  | 6,216 |  |  | 7 |  |  | 2,187 |  |  | 13 |  |  | 1,573 |  |  | 44 |  |  | 9,976 |  |  | 2,414,778 |  |  | 2,424,754 |  |  | — |
Home equity | 23 |  |  | 1,640 |  |  | 4 |  |  | 1,238 |  |  | 10 |  |  | 529 |  |  | 37 |  |  | 3,407 |  |  | 1,094,219 |  |  | 1,097,626 |  |  | — |
Other consumer (1) | 413 |  |  | 288 |  |  | 14 |  |  | 31 |  |  | 6 |  |  | 8 |  |  | 433 |  |  | 327 |  |  | 32,327 |  |  | 32,654 |  |  | — |
Total | 480 |  |  | $ | 23,616 |  |  | 29 |  |  | $ | 29,433 |  |  | 40 |  |  | $ | 10,305 |  |  | 549 |  |  | $ | 63,354 |  |  | $ | 14,214,716 |  |  | $ | 14,278,070 |  |  | $ | — |
(1)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances. (2)The amount of net deferred costs on originated loans included in the ending balance was $5.7 million and $6.4 million at March 31, 2024 and December 31, 2023, respectively. Net unamortized discounts on acquired loans included in the ending balance was $8.5 million and $8.6 million at March 31, 2024 and December 31, 2023, respectively.
Financing Receivable, Nonaccrual [Table Text Block] | The following table shows information regarding nonaccrual loans as of the dates indicated:
| Nonaccrual Balances
| March 31, 2024 |  | December 31, 2023
| With Allowance for Credit Losses |  | Without Allowance for Credit Losses (1) |  | Total |  | With Allowance for Credit Losses |  | Without Allowance for Credit Losses (1) |  | Total
| (Dollars in thousands)
Commercial and industrial | $ | 17,640 |  |  | $ | — |  |  | $ | 17,640 |  |  | $ | 19,890 |  |  | $ | 298 |  |  | $ | 20,188 |
Commercial real estate | 16,361 |  |  | 7,852 |  |  | 24,213 |  |  | 11,911 |  |  | 11,041 |  |  | 22,952 |
Small business | 316 |  |  | — |  |  | 316 |  |  | 394 |  |  | 4 |  |  | 398 |
Residential real estate | 9,947 |  |  | — |  |  | 9,947 |  |  | 7,634 |  |  | — |  |  | 7,634 |
Home equity | 4,805 |  |  | — |  |  | 4,805 |  |  | 3,171 |  |  | — |  |  | 3,171 |
Other consumer | 20 |  |  | — |  |  | 20 |  |  | 40 |  |  | — |  |  | 40 |
Total nonaccrual loans | $ | 49,089 |  |  | $ | 7,852 |  |  | $ | 56,941 |  |  | $ | 43,040 |  |  | $ | 11,343 |  |  | $ | 54,383 |
(1)Nonaccrual balances reported above without an allowance for credit losses are attributable to loans evaluated on an individual basis where it was determined that there was no risk of loss due to sufficient underlying collateral values.
Financing Receivable, Modified, Past Due | The following table depicts the amortized cost and payment status of loans that have been modified in the last 12 months as of March 31, 2024:
| Payment Status (Amortized Cost Basis)
| Current |  | 30-89 Days Past Due |  | 90+ Days Past Due
| (Dollars in thousands)
Loan Type |  |  |  |  |
Commercial and industrial | $ | 11,963 |  |  | $ | — |  |  | $ | — |
Commercial real estate | 27,094 |  |  | — |  |  | 136 |
Small business | 159 |  |  | — |  |  | — |
Total | $ | 49,932 |  |  | $ | — |  |  | $ | 136 |
Financing Receivable, Troubled Debt Restructuring [Table Text Block] | The following tables present the period end amortized cost basis of loans modified to borrowers experiencing financial difficulty during the three months ended March 31, 2024 and 2023, respectively, disaggregated by class of financing receivable and type of modification granted:
| Three Months Ended March 31, 2024 |  | Three Months Ended March 31, 2023
| Interest Rate Reduction
| Amortized Cost Basis |  | % of Total Class of Financing Receivable |  | Amortized Cost Basis |  | % of Total Class of Financing Receivable
Loan Type | (Dollars in thousands)
Small business | $ | 51 |  |  | 0.02% |  | $ | — |  |  | —%
Total | $ | 51 |  |  |  |  | $ | — |  |  |
| Term Extension
| Amortized Cost Basis |  | % of Total Class of Financing Receivable |  | Amortized Cost Basis |  | % of Total Class of Financing Receivable
Loan Category | (Dollars in thousands)
Commercial and industrial | $ | 9,725 |  |  | 0.62% |  | $ | — |  |  | —%
Commercial real estate | 3,375 |  |  | 0.04% |  | 2,540 |  |  | 0.03%
Commercial construction | 10,644 |  |  | 1.28% |  | — |  |  | —%
Small business | — |  |  | —% |  | 105 |  |  | 0.05%
Total | $ | 23,744 |  |  |  |  | $ | 2,645 |  |  |
| Other-Than-Insignificant Payment Delay
| Amortized Cost Basis |  | % of Total Class of Financing Receivable |  | Amortized Cost Basis |  | % of Total Class of Financing Receivable
Loan Category | (Dollars in thousands)
Commercial and industrial | $ | 1,809 |  |  | 0.11% |  | $ | 2,805 |  |  | 0.17%
Commercial real estate | 6,351 |  |  | 0.08% |  | 7,013 |  |  | 0.09%
Total | $ | 8,160 |  |  |  |  | $ | 9,818 |  |  |
| Combination - Interest Rate Reduction and Term Extension
| Amortized Cost Basis |  | % of Total Class of Financing Receivable |  | Amortized Cost Basis |  | % of Total Class of Financing Receivable
Loan Category | (Dollars in thousands)
Commercial and industrial | $ | 179 |  |  | 0.01% |  | $ | — |  |  | —%
Small business | — |  |  | —% |  | 44 |  |  | 0.02%
Home equity | 72 |  |  | 0.01% |  | — |  |  | —%
Total | 251 |  |  |  |  | 44 |  |  |
Grand Total | $ | 32,206 |  |  |  |  | $ | 12,507 |  |  |
The following table describes the financial effect of modifications made to borrowers experiencing financial difficulty for the periods indicated:
Three Months Ended March 31, 2024
Term Extension
Loan Category |  | Financial Effect
Commercial and industrial |  | Added a weighted-average contractual term of 3 months to the life of the loans
Commercial real estate |  | Added a weighted-average contractual term of 6 months to the life of the loans
Commercial construction |  | Added a weighted-average contractual term of 5 months to the life of the loans
Interest Rate Reduction
Loan Category |  | Financial Effect
Small business |  | Reduced contractual rate on one loan from 11.00% to 8.20%
Combination - Interest Rate Reduction and Term Extension
Loan Category |  | Financial Effect
Commercial and industrial |  | Reduced contractual rate on one loan from 10.10% to 7.20% and added a weighted average contractual term of 1.5 years
Home equity |  | Reduced contractual rate on one loan from 10.00% to 6.80% and added a weighted-average contractual term of 8.1 years
Three Months Ended March 31, 2023
Term Extension
Loan Category |  | Financial Effect
Commercial real estate |  | Added a weighted-average contractual term of 2 months to the life of the loans
Small business |  | Added a weighted-average contractual term of 4.3 years to the life of the loans
Interest Rate Reduction
Loan Category |  | Financial Effect
Small business |  | Reduced weighted-average contractual interest rate from 10.00% to 6.50%

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