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Loans, Allowance for Credit Losses and Credit Quality (Tables)
 6 Months Ended
Jun. 30, 2026
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 June 30, 2026
(Dollars in thousands)
Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Residential
Real Estate		      
Home Equity		Other ConsumerTotal
Allowance for credit losses
Beginning balance$49,282 $82,992 $14,212 $29,900 $13,268 $906 $190,560 
Charge-offs(538)(146)— — (2)(1,179)(1,865)
Recoveries74 88 — — 45 747 954 
Provision for (release of) credit losses8,062 (4,055)(341)1,643 251 690 6,250 
Ending balance (1)
$56,880 $78,879 $13,871 $31,543 $13,562 $1,164 $195,899 
Three Months Ended June 30, 2025
(Dollars in thousands)
Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Residential
Real Estate		Home EquityOther ConsumerTotal
Allowance for credit losses
Beginning balance$37,219 $61,416 $8,377 $25,469 $10,846 $765 $144,092 
Charge-offs(2,845)(3,348)— — — (773)(6,966)
Recoveries52 1 — — 49 345 447 
Provision for (release of) credit losses4,025 2,858 (194)(55)16 550 7,200 
Ending balance (1)
$38,451 $60,927 $8,183 $25,414 $10,911 $887 $144,773 
Six Months Ended June 30, 2026
(Dollars in thousands)
Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Residential
Real Estate		Home  EquityOther ConsumerTotal
Allowance for credit losses
Beginning balance$47,976 $84,916 $14,254 $29,254 $12,376 $1,101 $189,877 
Charge-offs(1,008)(4,370)— — (2)(2,261)(7,641)
Recoveries233 278 — — 57 1,345 1,913 
Provision for credit losses9,679 (1,945)(383)2,289 1,131 979 11,750 
Ending balance (1)
$56,880 $78,879 $13,871 $31,543 $13,562 $1,164 $195,899 
Six Months Ended June 30, 2025
(Dollars in thousands)
Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Residential
Real Estate		      
Home  Equity		Other ConsumerTotal
Allowance for credit losses
Beginning balance$30,799 $93,718 $8,166 $25,238 $11,007 $1,056 $169,984 
Charge-offs(3,012)(43,344)— — (96)(1,914)(48,366)
Recoveries67 1 — — 67 820 955 
Provision for (release of) credit losses10,597 10,552 17 176 (67)925 22,200 
Ending balance (1)
$38,451 $60,927 $8,183 $25,414 $10,911 $887 $144,773 
(1)Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $68.3 million and $54.5 million as of June 30, 2026 and June 30, 2025, 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 June 30, 2026, and gross charge-offs for the six month period then ended:
June 30, 2026
20262025202420232022PriorRevolving Loans
Revolving converted to Term(1)
Total(2)
(Dollars in thousands)
Commercial and
industrial
Pass $441,443 $825,841 $594,083 $398,924 $369,658 $962,033 $921,980 $10,140 $4,524,102 
Special mention4,145 50,525 22,835 5,492 3,522 17,858 12,102 — 116,479 
Substandard7,730 27,090 9,720 3,716 4,380 5,097 32,070 — 89,803 
Doubtful— — 115 16 — — 312 — 443 
Loss— — — — — — — — — 
Total commercial and industrial$453,318 $903,456 $626,753 $408,148 $377,560 $984,988 $966,464 $10,140 $4,730,827 
Current-period gross write-offs$— $45 $32 $35 $39 $68 $789 $— $1,008 
Commercial real estate
Pass$644,063 $1,135,390 $802,981 $831,658 $1,123,211 $3,025,781 $137,975 $— $7,701,059 
Special mention17,171 37,171 21,344 10,504 1,090 55,002 241 — 142,523 
Substandard3,611 1,277 26,783 14,613 1,853 30,105 — — 78,242 
Doubtful— 22,275 — — — — — — 22,275 
Loss— — — — — — — — — 
Total commercial real estate$664,845 $1,196,113 $851,108 $856,775 $1,126,154 $3,110,888 $138,216 $— $7,944,099 
Current-period gross write-offs$— $4,370 $— $— $— $— $— $— $4,370 
Commercial construction
Pass$350,273 $482,515 $224,735 $165,673 $41,316 $50,929 $53,154 $— $1,368,595 
Special mention24,388 46,388 — 8,939 — — — — 79,715 
Substandard9,831 — 1,138 — — 2,993 2,177 — 16,139 
Doubtful— — — — — — — — — 
Loss— — — — — — — — — 
Total commercial construction$384,492 $528,903 $225,873 $174,612 $41,316 $53,922 $55,331 $— $1,464,449 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Residential real estate
Pass$145,268 $257,548 $222,403 $452,134 $622,917 $1,160,784 $— $— $2,861,054 
Default— 262 — 1,757 1,967 5,237 — — 9,223 
Total residential real estate$145,268 $257,810 $222,403 $453,891 $624,884 $1,166,021 $— $— $2,870,277 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Home equity
Pass$4,086 $10,052 $11,919 $16,835 $27,957 $176,222 $1,078,968 $12,997 $1,339,036 
Default— — — — — 290 3,402 69 3,761 
Total home equity$4,086 $10,052 $11,919 $16,835 $27,957 $176,512 $1,082,370 $13,066 $1,342,797 
Current-period gross write-offs$— $— $— $— $— $2 $— $— $2 
Other consumer(3)
Pass$400 $1,141 $1,478 $1,299 $767 $1,361 $35,431 $— $41,877 
Default— — — — — — 1 — 1 
Total other consumer$400 $1,141 $1,478 $1,299 $767 $1,361 $35,432 $— $41,878 
Current-period gross write-offs $2,204 $— $— $— $3 $31 $23 $— $2,261 
Total$1,652,409 $2,897,475 $1,939,534 $1,911,560 $2,198,638 $5,493,692 $2,277,813 $23,206 $18,394,327 
Total current-period gross write-offs$2,204 $4,415 $32 $35 $42 $101 $812 $— $7,641 
The following table details the amortized cost balances of the Company’s loan portfolios, presented by credit quality indicator and origination year, as of December 31, 2025, and gross charge-offs for the year then ended:
December 31, 2025
20252024202320222021PriorRevolving Loans
Revolving converted to Term(1)
Total(2)
(Dollars in thousands)
Commercial and
industrial
Pass$1,050,723 $674,956 $427,794 $408,646 $310,331 $777,748 $802,675 $— $4,452,873 
Special mention22,454 8,171 7,458 4,700 10,241 7,253 17,091 — 77,368 
Substandard28,004 15,826 445 5,045 2,358 2,306 27,544 — 81,528 
Doubtful— — 20 — — — — — 20 
Loss— — — — — — — — — 
Total commercial and industrial$1,101,181 $698,953 $435,717 $418,391 $322,930 $787,307 $847,310 $— $4,611,789 
Current-period gross write-offs$— $42 $62 $98 $900 $76 $7,635 $— $8,813 
Commercial real estate
Pass$1,254,204 $868,351 $991,179 $1,233,528 $1,212,646 $2,323,268 $153,939 $— $8,037,115 
Special mention56,300 20,655 9,865 697 4,052 29,328 197 — 121,094 
Substandard25,600 32,514 20,927 1,326 10,291 4,266 — — 94,924 
Doubtful22,275 — — — — — — — 22,275 
Loss— — — — — — — — — 
Total commercial real estate$1,358,379 $921,520 $1,021,971 $1,235,551 $1,226,989 $2,356,862 $154,136 $— $8,275,408 
Current-period gross write-offs$8,126 $— $26,862 $— $7,089 $1,335 $— $— $43,412 
Commercial construction
Pass$509,630 $362,300 $237,679 $69,779 $62,752 $23,781 $57,615 $— $1,323,536 
Special mention29,634 29,516 — — — — — — 59,150 
Substandard9,822 848 — — — 2,992 — — 13,662 
Doubtful— — — 2,845 — — — — 2,845 
Loss— — — — — — — — — 
Total commercial construction$549,086 $392,664 $237,679 $72,624 $62,752 $26,773 $57,615 $— $1,399,193 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Residential real estate
Pass$273,907 $252,544 $487,064 $640,426 $405,352 $807,275 $— $— $2,866,568 
Default— — 742 1,626 301 4,206 — — 6,875 
Total residential real estate$273,907 $252,544 $487,806 $642,052 $405,653 $811,481 $— $— $2,873,443 
Current-period gross write-offs$— $— $— $— $— $— $— $— $— 
Home equity
Pass$10,970 $13,118 $18,339 $29,574 $43,928 $145,224 $1,011,854 $21,027 $1,294,034 
Default— — — — — 587 2,991 50 3,628 
Total home equity$10,970 $13,118 $18,339 $29,574 $43,928 $145,811 $1,014,845 $21,077 $1,297,662 
Current-period gross write-offs$— $— $— $— $— $— $96 $— $96 
Other consumer(3)
Pass$1,395 $1,781 $1,570 $906 $868 $1,067 $38,693 $— $46,280 
Default— — — — — — 2 — 2 
Total other consumer$1,395 $1,781 $1,570 $906 $868 $1,067 $38,695 $— $46,282 
Current-period gross write-offs$4,428 $22 $10 $— $— $— $23 $— $4,483 
Total$3,294,918 $2,280,580 $2,203,082 $2,399,098 $2,063,120 $4,129,301 $2,112,601 $21,077 $18,503,777 
Total current-period gross write-offs$12,554 $64 $26,934 $98 $7,989 $1,411 $7,754 $— $56,804 
(1)Amounts presented represent the amortized cost as of June 30, 2026 and December 31, 2025 of revolving loans that were converted to term loans during the three and twelve months then ended, respectively.
(2)Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.
(3)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:
June 30, 2026December 31, 2025
(Dollars in thousands)
Foreclosed residential real estate property held by the creditor$206 $— 
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure$5,219 $4,102 
Financing Receivable Credit Quality Indicators For Consumer And Residential Portfolio Table Text Block
June 30
2026		December 31
2025
Residential real estate portfolio
FICO score (re-scored) (1)
754 754 
LTV (re-valued) (2)
56.2 %57.2 %
Home equity portfolio
FICO score (re-scored) (1)
768 769 
LTV (re-valued) (2)(3)
45.1 %45.3 %
(1)The weighted average FICO scores for June 30, 2026 and December 31, 2025 are based upon rescores from June 2026 and December 2025, respectively. For any borrower where rescores were not available, the most recent FICO score data was used.
(2)The combined LTV ratios for June 30, 2026 and December 31, 2025 are calculated with consideration given to either the value obtained at origination or an updated automated valuation. Newly originated loans with valuations obtained in the previous 12 months will rely on the value obtained at origination. The remainder of the portfolio utilized updated automated valuation as of May 2026 and November 2025 for the purposes of the June 30, 2026 and December 31, 2025 ratios, respectively. If the updated value is not available, the most recent valuation or the original value will be used, depending on valuation age. 
(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:
June 30, 2026
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 industrial19 $5,472 16 $4,067 48 $7,836 83 $17,375 $4,713,452 $4,730,827 
Commercial real estate5 1,508 5 27,627 6 5,211 16 34,346 7,909,753 7,944,099 
Commercial construction1 802 2 878 2 2,925 5 4,605 1,459,844 1,464,449 
Residential real estate28 8,117 22 5,665 19 3,559 69 17,341 2,852,936 2,870,277 
Home equity18 975 8 1,213 23 3,761 49 5,949 1,336,848 1,342,797 
Other consumer (1)
540 310 6 5 1 1 547 316 41,562 41,878 
Total611 $17,184 59 $39,455 99 $23,293 769 $79,932 $18,314,395 $18,394,327 
December 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 industrial36 $7,765 18 $3,627 35 $5,776 89 $17,168 $4,594,621 $4,611,789 
Commercial real estate15 7,037 3 619 7 10,103 25 17,759 8,257,649 8,275,408 
Commercial construction1 804 1 488 2 3,693 4 4,985 1,394,208 1,399,193 
Residential real estate20 5,592 16 3,597 18 3,278 54 12,467 2,860,976 2,873,443 
Home equity20 3,247 9 456 24 3,629 53 7,332 1,290,330 1,297,662 
Other consumer (1)
624 321 15 27 3 3 642 351 45,931 46,282 
Total716 $24,766 62 $8,814 89 $26,482 867 $60,062 $18,443,715 $18,503,777 
(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 $9.6 million and $7.7 million at June 30, 2026 and December 31, 2025, respectively. Net unamortized discounts on acquired loans included in the ending balance were $143.5 million and $157.0 million at June 30, 2026 and December 31, 2025, respectively.
Financing Receivable, Nonaccrual [Table Text Block]
The following table shows information regarding non-accrual loans as of the dates indicated:
Non-accrual Balances
June 30, 2026December 31, 2025
With Allowance for Credit Losses
Without Allowance for Credit Losses (1)
TotalWith Allowance for Credit Losses
Without Allowance for Credit Losses (1)
Total
(Dollars in thousands)
Commercial and industrial$8,803 $401 $9,204 $8,173 $987 $9,160 
Commercial real estate37,805 26,739 64,544 26,674 23,841 50,515 
Commercial construction2,925 — 2,925 848 2,845 3,693 
Residential real estate20,305 — 20,305 15,043 — 15,043 
Home equity6,648 — 6,648 5,102 — 5,102 
Other consumer16 — 16 44 — 44 
Total non-accrual loans $76,502 $27,140 $103,642 $55,884 $27,673 $83,557 
(1)Non-accrual 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 June 30, 2026
Amortized Cost Basis% of Total Class of Financing ReceivableFinancial Effect
(Dollars in thousands)
Term Extension and Interest Rate Reduction
Commercial real estate$4,397 0.06%
Extended the contractual term on one loan by 1.5 years and reduced the interest rate from 7.50% to 5.50%
Total Outstanding Modified$4,397 
Six Months Ended June 30, 2026
Amortized Cost Basis% of Total Class of Financing ReceivableFinancial Effect
(Dollars in thousands)
Term Extension
Commercial and industrial$1,090 0.02%
Added a weighted-average contractual term of 1 year to the life of the loans
Commercial real estate14,967 0.19%
Added a weighted-average contractual term of 10 months to the life of the loans
Total$16,057 
Term Extension and Interest Rate Reduction
Commercial real estate$4,397 0.06%
Added a weighted-average contractual term of 1.5 years to the life of the loans and reduced the weighted-average interest rate from 7.50% to 5.50%
Total$4,397 
Total Outstanding Modified$20,454 
Three Months Ended June 30, 2025
Amortized Cost Basis% of Total Class of Financing ReceivableFinancial Effect
(Dollars in thousands)
Term Extension
Commercial and industrial$4,118 0.12 %
Added a weighted-average contractual term of 1.2 years to the life of the loans
Commercial real estate1,653 0.02 %
Extend contractual term on one loan by 3 months
Home equity245 0.02 %
Added a weighted-average contractual term of 5.2 years to the life of the loans
Total$6,016 
Other Than Insignificant Payment Delays
Commercial and industrial$1,036 0.03 %Modification was made with minimal financial effect
Total$1,036 
Term Extension and Interest Rate Reduction
Commercial and industrial$93 — %
Extended the contractual term on one loan by 5.0 years and reduced the interest rate from 9.50% to 6.69%
Commercial real estate13,015 0.20 %
Extended the contractual term on one loan by 3.0 years and reduced the interest rate from 7.70% to 6.25%
Home equity229 0.02 %
Extended the contractual term on one loan by 17.5 years and reduced the interest rate from 7.24% to 6.88%
Total$13,337 
Interest Rate Reduction and Other Than Insignificant Payment Delay
Commercial real estate$22,248 0.34 %
Modification on one loan included an interest rate reduction from 5.91% to 5.50% and payment deferral of 13 months
Total$22,248 
Total Outstanding Modified$42,637 
Six Months Ended June 30, 2025
Amortized Cost Basis% of Total Class of Financing ReceivableFinancial Effect
(Dollars in thousands)
Term Extension
Commercial and industrial$9,225 0.27 %
Added a weighted-average contractual term of 1 year to the life of the loans
Commercial real estate5,028 0.08 %
Added a weighted-average contractual term of 5 months to the life of the loans
Residential real estate272 0.01 %
Extended the contractual term on one loan by 17.8 years
Home equity245 0.02 %
Added a weighted-average contractual term of 5.2 years to the life of the loans
Total$14,770 
Other Than Insignificant Payment Delay
Commercial and industrial$1,036 0.03 %Modification was made with minimal financial effect
Commercial real estate11,002 0.17 %Modification was made with minimal financial effect
Total$12,038 
Term Extension and Interest Rate Reduction
Commercial and industrial$93 — %
Extended the contractual term on one loan by 5.0 years and reduced the interest rate from 9.50% to 6.69%
Commercial real estate25,093 0.38 %
Added a weighted-average contractual term of 3.7 years to the life of the loans and reduced the weighted-average interest rate from 7.85% to 6.83%
Home equity1,185 0.10 %
Extended the contractual term on one loan by 23.6 years and reduced the interest rate from 7.25% to 6.88%
Total$26,371 
Interest Rate Reduction and Other Than Insignificant Payment Delay
Commercial real estate$22,248 0.34 %
Modification on one loan included an interest rate reduction from 5.91% to 5.50% and payment deferral of 13 months
Total$22,248 
Total Outstanding Modified$75,427