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Loans, Allowance for Credit Losses and Credit Quality (Tables)
 3 Months Ended
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 ConsumerTotal
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)
Recoveries85 — — 39 — 133 350 607 
Provision for (release of) credit losses1,161 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  EquityOther ConsumerTotal
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)
Recoveries5 — — 31 — 16 225 277 
Provision for (release of) credit losses9,649 (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
20242023202220212020PriorRevolving LoansRevolving converted to TermTotal (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 mention3,160 3,254 1,843 322 9,206 4,024 31,525 — 53,334 
Substandard1,809 — 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 
Substandard6,350 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 mention3,326 18,724 — 5,618 — — — — 27,668 
Substandard10,585 — 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 
Substandard180 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
20222021202020192018PriorRevolving LoansRevolving converted to TermTotal (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 mention154 52,961 67,200 29,611 13,139 225,673 — — 388,738 
Substandard3,481 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 mention18,431 — 5,889 3,919 — — — — 28,239 
Substandard7,619 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 
Substandard105 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, 2024December 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 days60-89 days90 days or moreTotal 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 industrial8 $743 2 $85 2 $17,555 12 $18,383 $1,561,658 $1,580,041 $— 
Commercial real estate10 20,582 — — 5 24,056 15 44,638 8,064,198 8,108,836 — 
Commercial construction1 1,019 — — — — 1 1,019 827,881 828,900 — 
Small business17 539 6 321 1 5 24 865 260,825 261,690 — 
Residential real estate14 3,482 3 248 16 2,641 33 6,371 2,414,334 2,420,705 — 
Home equity17 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 — 
Total482 $27,803 28 $774 39 $45,959 549 $74,536 $14,256,058 $14,330,594 $— 
 December 31, 2023
 30-59 days60-89 days90 days or moreTotal 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 industrial6 $398 1 $17,538 2 $673 9 $18,609 $1,561,377 $1,579,986 $— 
Commercial real estate8 14,674 2 8,419 3 7,279 13 30,372 8,011,136 8,041,508 — 
Commercial construction— — — — — — — — 849,586 849,586 — 
Small business6 400 1 20 6 243 13 663 251,293 251,956 — 
Residential real estate24 6,216 7 2,187 13 1,573 44 9,976 2,414,778 2,424,754 — 
Home equity23 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 — 
Total480 $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, 2024December 31, 2023
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$17,640 $— $17,640 $19,890 $298 $20,188 
Commercial real estate16,361 7,852 24,213 11,911 11,041 22,952 
Small business316 — 316 394 4 398 
Residential real estate9,947 — 9,947 7,634 — 7,634 
Home equity4,805 — 4,805 3,171 — 3,171 
Other consumer20 — 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)
Current30-89 Days Past Due90+ Days Past Due
(Dollars in thousands)
Loan Type
Commercial and industrial$11,963 $— $— 
Commercial real estate27,094 — 136 
Small business159 — — 
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, 2024Three Months Ended March 31, 2023
Interest Rate Reduction
Amortized Cost Basis% of Total Class of Financing ReceivableAmortized 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 ReceivableAmortized Cost Basis% of Total Class of Financing Receivable
Loan Category(Dollars in thousands)
Commercial and industrial$9,725 0.62%$— —%
Commercial real estate3,375 0.04%2,540 0.03%
Commercial construction10,644 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 ReceivableAmortized 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 estate6,351 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 ReceivableAmortized 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 equity72 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 CategoryFinancial 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 CategoryFinancial Effect
Small business
Reduced contractual rate on one loan from 11.00% to 8.20%
Combination - Interest Rate Reduction and Term Extension
Loan CategoryFinancial 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 CategoryFinancial 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 CategoryFinancial Effect
Small business
Reduced weighted-average contractual interest rate from 10.00% to 6.50%