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Loans, Allowance for Credit Losses and Credit Quality (Tables)
 3 Months Ended
Mar. 31, 2025
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, 2025
 (Dollars in thousands)
 Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Small
Business		Residential
Real Estate		      
Home Equity		Other ConsumerTotal
Allowance for credit losses
Beginning balance$27,800 $92,535 $8,166 $4,182 $25,238 $11,007 $1,056 $169,984 
Charge-offs(55)(39,996)— (112)— (96)(1,141)(41,400)
Recoveries2 — — 13 — 18 475 508 
Provision for (release of) credit losses6,453 7,578 211 235 231 (83)375 15,000 
Ending balance (1)$34,200 $60,117 $8,377 $4,318 $25,469 $10,846 $765 $144,092 
Three Months Ended March 31, 2024
(Dollars in thousands)
Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Small
Business		Residential
Real Estate		Home EquityOther ConsumerTotal
Allowance for credit losses
Beginning balance$33,317 $60,074 $7,683 $3,963 $23,637 $12,797 $751 $142,222 
Charge-offs— — — (109)— — (772)(881)
Recoveries85 — — 39 — 133 350 607 
Provision for (release of) credit losses1,773 3,169 (110)135 543 (888)378 5,000 
Ending balance (1)$35,175 $63,243 $7,573 $4,028 $24,180 $12,042 $707 $146,948 
(1)Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $53.7 million and $59.3 million as of March 31, 2025 and March 31, 2024, 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, 2025
20252024202320222021PriorRevolving LoansRevolving converted to TermTotal (1)
 (Dollars in thousands)
Commercial and
industrial
Pass $199,883 $623,478 $294,487 $338,786 $225,004 $638,791 $642,809 $— $2,963,238 
Special mention4,218 17,892 529 643 10,483 2,821 28,355 — 64,941 
Substandard28,048 9,837 4,168 3,417 183 325 31,455 — 77,433 
Doubtful— — — — — — 4,820 — 4,820 
Loss— — — — — — — — — 
Total commercial and industrial$232,149 $651,207 $299,184 $342,846 $235,670 $641,937 $707,439 $— $3,110,432 
Current-period gross write-offs$— $— $— $55 $— $— $— $— $55 
Commercial real estate
Pass$287,131 $738,721 $851,530 $870,039 $970,846 $2,638,489 $93,810 $— $6,450,566 
Special mention24,865 14,570 3,947 — 2,755 42,545 197 — 88,879 
Substandard— 9,255 13,017 12,866 10,098 5,019 — — 50,255 
Doubtful— 22,248 27,801 — 4,640 7,086 — — 61,775 
Loss— — — — — — — — — 
Total commercial real estate$311,996 $784,794 $896,295 $882,905 $988,339 $2,693,139 $94,007 $— $6,651,475 
Current-period gross write-offs$— $8,126 $24,850 $— $7,020 $— $— $— $39,996 
Commercial construction
Pass$55,475 $296,092 $176,124 $84,491 $62,968 $24,382 $30,341 $— $729,873 
Special mention— 9,005 — 16,290 — — — — 25,295 
Substandard— 32,027 — 8,967 — — — — 40,994 
Doubtful— — — — — — — — — 
Loss— — — — — — — — — 
Total commercial construction$55,475 $337,124 $176,124 $109,748 $62,968 $24,382 $30,341 $— $796,162 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Small business
Pass$15,237 $54,184 $41,346 $41,161 $32,039 $47,570 $54,269 $— $285,806 
Special mention— — 99 76 109 249 843 — 1,376 
Substandard— 184 253 831 — 382 316 — 1,966 
Doubtful— — — — — — — — — 
Loss— — — — — — — — — 
Total small business$15,237 $54,368 $41,698 $42,068 $32,148 $48,201 $55,428 $— $289,148 
Current-period gross write-offs$— $— $14 $— $— $— $98 $— $112 
Residential real estate
Pass$44,549 $195,954 $465,868 $599,385 $377,475 $780,050 $— $— $2,463,281 
Default— — — 266 1,109 1,075 — — 2,450 
Total residential real estate$44,549 $195,954 $465,868 $599,651 $378,584 $781,125 $— $— $2,465,731 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Home equity
Pass$1,756 $14,742 $22,197 $31,848 $47,833 $166,401 $853,495 $4,389 $1,142,661 
Default— — — — — 436 869 — 1,305 
Total home equity$1,756 $14,742 $22,197 $31,848 $47,833 $166,837 $854,364 $4,389 $1,143,966 
Current-period gross write-offs$— $— $— $— $— $— $96 $— $96 
Other consumer (2)
Pass$251 $569 $325 $76 $440 $1,071 $32,321 $— $35,053 
Default— — — — — — 2 — 2 
Total other consumer$251 $569 $325 $76 $440 $1,071 $32,323 $— $35,055 
Current-period gross write-offs $1,140 $— $— $— $— $— $1 $— $1,141 
Total$661,413 $2,038,758 $1,901,691 $2,009,142 $1,745,982 $4,356,692 $1,773,902 $4,389 $14,491,969 
Total current-period gross write-offs$1,140 $8,126 $24,864 $55 $7,020 $— $195 $— $41,400 
December 31, 2024
20242023202220212020PriorRevolving LoansRevolving converted to TermTotal (1)
(Dollars in thousands)
Commercial and
industrial
Pass$690,411 $302,384 $351,296 $243,361 $166,779 $504,804 $623,730 $1,117 $2,883,882 
Special mention18,600 554 2,394 10,610 871 2,458 40,927 — 76,414 
Substandard16,933 4,195 5,276 27,641 139 22 21,517 — 75,723 
Doubtful— — — — — — 11,652 — 11,652 
Loss— — — — — — — — — 
Total commercial and industrial$725,944 $307,133 $358,966 $281,612 $167,789 $507,284 $697,826 $1,117 $3,047,671 
Current-period gross write-offs$— $— $— $— $— $— $5,897 $— $5,897 
Commercial real estate
Pass$774,331 $866,492 $907,629 $1,036,174 $997,858 $1,823,148 $98,473 $241 $6,504,346 
Special mention16,243 5,935 — 760 — 60,184 198 — 83,320 
Substandard53,532 13,017 12,967 10,145 916 5,836 — — 96,413 
Doubtful— 53,752 — 11,660 — 7,217 — — 72,629 
Loss— — — — — — — — — 
Total commercial real estate$844,106 $939,196 $920,596 $1,058,739 $998,774 $1,896,385 $98,671 $241 $6,756,708 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Commercial construction
Pass$288,979 $173,856 $130,245 $62,972 $— $24,583 $32,077 $1,756 $714,468 
Special mention— 2,316 15,622 9,078 — — — — 27,016 
Substandard31,549 — 9,045 — — — — — 40,594 
Doubtful— — — — — — — — — 
Loss— — — — — — — — — 
Total commercial construction$320,528 $176,172 $154,912 $72,050 $— $24,583 $32,077 $1,756 $782,078 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Small business
Pass$56,869 $44,676 $43,925 $32,858 $21,527 $26,457 $52,919 $1 $279,232 
Special mention— 102 16 114 93 218 607 — 1,150 
Substandard199 259 63 1 180 329 368 — 1,399 
Doubtful— — — — — — — — — 
Loss— — — — — — — — — 
Total small business$57,068 $45,037 $44,004 $32,973 $21,800 $27,004 $53,894 $1 $281,781 
Current-period gross write-offs$48 $39 $35 $54 $— $— $520 $— $696 
Residential real estate
Pass$197,985 $472,546 $607,105 $381,182 $173,047 $625,111 $— $— $2,456,976 
Default— 209 636 373 742 1,664 — — 3,624 
Total residential real estate$197,985 $472,755 $607,741 $381,555 $173,789 $626,775 $— $— $2,460,600 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Home equity
Pass$14,888 $24,020 $32,577 $49,290 $45,322 $127,029 $829,688 $16,229 $1,139,043 
Default— — — — — 226 803 96 1,125 
Total home equity$14,888 $24,020 $32,577 $49,290 $45,322 $127,255 $830,491 $16,325 $1,140,168 
Current-period gross write-offs$— $— $— $— $— $— $241 $139 $380 
Other consumer (2)
Pass$651 $445 $151 $599 $211 $1,158 $36,157 $— $39,372 
Default— — — — — — — — — 
Total other consumer$651 $445 $151 $599 $211 $1,158 $36,157 $— $39,372 
Current-period gross write-offs$3,339 $— $— $— $— $19 $16 $— $3,374 
Total$2,161,170 $1,964,758 $2,118,947 $1,876,818 $1,407,685 $3,210,444 $1,749,116 $19,440 $14,508,378 
Total current -period gross write-offs$3,387 $39 $35 $54 $— $19 $6,674 $139 $10,347 
(1)Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.
(2)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances and the associated gross write-offs.
Foreclosed Residential Real Estate Property [Table Text Block]
The following table shows information regarding foreclosed residential real estate property at the dates indicated:
March 31, 2025December 31, 2024
(Dollars in thousands)
Foreclosed residential real estate property held by the creditor$— $— 
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure$2,416 $1,301 
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
2025		December 31
2024
Residential real estate portfolio
FICO score (re-scored)(1)756 755 
LTV (re-valued)(2)58.2 %57.9 %
Home equity portfolio
FICO score (re-scored)(1)770 769 
LTV (re-valued)(2)(3)44.4 %43.9 %
(1)The average FICO scores at March 31, 2025 are based upon rescores from March 2025 as available for previously originated loans, or origination score data for loans booked in March 2025.  The average FICO scores at December 31, 2024 were based upon rescores from December 2024, as available for previously originated loans, or origination score data for loans booked in December 2024.
(2)The combined LTV ratios for March 31, 2025 are based upon updated automated valuations as of February 2025, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2024 were based upon updated automated valuations as of November 2024, 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, 2025
 30-59 days60-89 days90 days or moreTotal Past Due Total
Financing
Receivables (2)
 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 industrial9 $8,087 1 $25 7 $9,545 17 $17,657 $3,092,775 $3,110,432 
Commercial real estate4 629 1 155 5 37,917 10 38,701 6,612,774 6,651,475 
Commercial construction— — — — — — — — 796,162 796,162 
Small business18 460 5 64 5 83 28 607 288,541 289,148 
Residential real estate12 3,043 7 1,844 11 2,449 30 7,336 2,458,395 2,465,731 
Home equity15 1,292 11 935 9 1,306 35 3,533 1,140,433 1,143,966 
Other consumer (1)417 300 9 17 7 6 433 323 34,732 35,055 
Total475 $13,811 34 $3,040 44 $51,306 553 $68,157 $14,423,812 $14,491,969 
 December 31, 2024
 30-59 days60-89 days90 days or moreTotal Past Due Total
Financing
Receivables (2)
 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 industrial7 $5,807 1 $5 5 $13,843 13 $19,655 $3,028,016 $3,047,671 
Commercial real estate3 33,087 — — 3 20,458 6 53,545 6,703,163 6,756,708 
Commercial construction— — — — — — — — 782,078 782,078 
Small business6 830 4 24 3 29 13 883 280,898 281,781 
Residential real estate27 6,310 9 1,401 10 2,224 46 9,935 2,450,665 2,460,600 
Home equity9 1,046 11 764 10 1,126 30 2,936 1,137,232 1,140,168 
Other consumer (1)596 441 3 7 6 6 605 454 38,918 39,372 
Total648 $47,521 28 $2,201 37 $37,686 713 $87,408 $14,420,970 $14,508,378 
(1)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.
(2)The amount of net deferred fees/costs on originated loans included in the ending balance was $6.0 million and $6.1 million at March 31, 2025 and December 31, 2024, respectively. Net unamortized discounts on acquired loans included in the ending balance were $7.7 million and $8.1 million at March 31, 2025 and December 31, 2024, respectively.
Financing Receivable, Nonaccrual [Table Text Block]
The following table shows information regarding nonaccrual loans as of the dates indicated:
Nonaccrual Balances
March 31, 2025December 31, 2024
With Allowance for Credit LossesWithout Allowance for Credit Losses (1)TotalWith Allowance for Credit LossesWithout Allowance for Credit Losses (1)Total
 (Dollars in thousands)
Commercial and industrial$9,683 $— $9,683 $2,500 $11,652 $14,152 
Commercial real estate7,208 58,632 65,840 67,126 7,217 74,343 
Small business156 — 156 302 — 302 
Residential real estate10,966 — 10,966 10,243 — 10,243 
Home equity2,840 — 2,840 2,479 — 2,479 
Other consumer8 — 8 10 — 10 
Total nonaccrual loans $30,861 $58,632 $89,493 $82,660 $18,869 $101,529 
(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
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 periods indicated, disaggregated by class of financing receivable, type of modification granted and the financial effect of the modifications:

Three Months Ended March 31, 2025
Amortized Cost Basis% of Total Class of Financing ReceivableFinancial Effect
(Dollars in thousands)
Term Extension
Commercial and industrial$5,204 0.17 %
Added a weighted-average contractual term of 11 months to the life of the loans
Commercial real estate3,375 0.05 %
Added a weighted-average contractual term of 6 months to the life of the loans
Residential real estate277 0.01 %
Extended contractual term on one loan by 17.8 years
Total$8,856 
Other Than Insignificant Payment Delay
Commercial real estate$11,002 0.17 %Modification was made with minimal financial effect
Total$11,002 
Term Extension and Interest Rate Reduction
Commercial real estate$12,109 0.18%
Extended the contractual term on one loan by 4.5 years and reduced the interest rate from 8.01% to 7.45%
Home equity958 0.08%
Extended the contractual term on one loan by 25.0 years and reduced the interest rate from 7.25% to 6.88%
Total$13,067 
Total Outstanding Modified$32,925 
Three Months Ended March 31, 2024
Amortized Cost Basis% of Total Class of Financing ReceivableFinancial Effect
(Dollars in thousands)
Term Extension
Commercial and industrial$9,725 0.33 %
Added a weighted-average contractual term of 3 months to the life of the loans
Commercial real estate3,375 0.05 %
Added a weighted-average contractual term of 6 months to the life of the loans
Commercial construction10,644 1.28 %
Added a weighted-average contractual term of 5 months to the life of the loans
Total$23,744 
Interest Rate Reduction
Small business51 0.02 %
Reduced contractual rate on one loan from 11.00% to 8.20%
Total$51 
Other Than Insignificant Payment Delays
Commercial and industrial$8,160 0.28 %Modification was made with minimal financial effect
Total$8,160 
Term Extension and Interest Rate Reduction
Commercial and industrial$179 0.01 %
Extended the contractual term on one loan by 1.5 years and reduced the interest rate from 10.10% to 7.20%
Home equity72 0.01 %
Extended the contractual term on one loan by 8.1 years and reduced the interest rate from 10.00% to 6.80%
Total$251 
Total Outstanding Modified$32,206