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Loans, Allowance for Credit Losses and Credit Quality (Tables)
 3 Months Ended
Mar. 31, 2023
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, 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 
 Three Months Ended March 31, 2022
 (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$14,402 $83,486 $12,316 $3,508 $14,484 $17,986 $740 $146,922 
Charge-offs— — — (48)— (24)(634)(706)
Recoveries13 3 — 26 — 26 234 302 
Provision for (release of) credit losses(246)947 (449)(327)3,904 (6,238)409 (2,000)
Ending balance (1)$14,169 $84,436 $11,867 $3,159 $18,388 $11,750 $749 $144,518 
(1)Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $52.7 million and $39.4 million as of March 31, 2023 and March 31, 2022, 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, 2023
20232022202120202019PriorRevolving LoansRevolving converted to TermTotal (1)
 (Dollars in thousands)
Commercial and
industrial
Pass (2)$153,554 $262,933 $122,770 $94,702 $54,925 $85,391 $811,795 $— $1,586,070 
Potential weakness— 4,712 705 868 1,608 1,342 24,114 — 33,349 
Definite weakness - loss unlikely — 2,295 1,516 164 377 1 2,936 — 7,289 
Partial loss probable— — — — — — 23,174 — 23,174 
Definite 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 
Potential weakness154 52,961 67,200 29,611 13,139 225,673 — — 388,738 
Definite weakness - loss unlikely3,481 39,208 13,205 5,334 4,038 23,821 — — 89,087 
Partial loss probable— — — — — — — — — 
Definite 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 
Potential weakness18,431 — 5,889 3,919 — — — — 28,239 
Definite weakness - loss unlikely7,619 11,434 2,130 — — — — — 21,183 
Partial loss probable— — — — — — — — — 
Definite 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 
Potential weakness— — — 158 — 228 527 — 913 
Definite weakness - loss unlikely105 126 113 304 3 686 865 — 2,202 
Partial loss probable— — — — — — — — — 
Definite 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 (3)
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 
March 31, 2022
20212020201920182017PriorRevolving LoansRevolving converted to TermTotal (1)
(Dollars in thousands)
Commercial and
industrial
Pass (2)$138,642 $288,516 $159,051 $85,497 $105,651 $30,082 $741,200 $— $1,548,639 
Potential weakness629 746 1,402 1,423 88 1,113 4,097 — 9,498 
Definite weakness - loss unlikely403 1,253 — 57 420 2,684 3,238 — 8,055 
Partial loss probable— — — — — — — — — 
Definite loss— — — — — — — — — 
Total commercial and industrial$139,674 $290,515 $160,453 $86,977 $106,159 $33,879 $748,535 $— $1,566,192 
Commercial real estate
Pass$226,907 $1,548,212 $1,254,460 $867,980 $830,148 $2,431,434 $135,980 $522 $7,295,643 
Potential weakness10,059 51,223 92,984 43,560 83,195 210,418 13,619 — 505,058 
Definite weakness - loss unlikely145 20,031 4,081 3,237 412 69,009 — — 96,915 
Partial loss probable— — — — — — — — — 
Definite loss— — — — — — — — — 
Total commercial real estate$237,111 $1,619,466 $1,351,525 $914,777 $913,755 $2,710,861 $149,599 $522 $7,897,616 
Commercial construction
Pass$82,805 $400,932 $440,129 $100,066 $30,145 $34,952 $34,416 $— $1,123,445 
Potential weakness— — 3,005 — — 12,935 — — 15,940 
Definite weakness - loss unlikely— 14,560 — — — — — — 14,560 
Partial loss probable— — — — — — — — — 
Definite loss— — — — — — — — — 
Total commercial construction$82,805 $415,492 $443,134 $100,066 $30,145 $47,887 $34,416 $— $1,153,945 
Small business
Pass$14,959 $52,037 $35,973 $19,540 $12,136 $24,449 $37,719 $— $196,813 
Potential weakness— 183 435 376 196 277 761 — 2,228 
Definite weakness - loss unlikely— — 601 20 7 283 453 — 1,364 
Partial loss probable— — — — — — — — — 
Definite loss— — — — — — — — — 
Total small business$14,959 $52,220 $37,009 $19,936 $12,339 $25,009 $38,933 $— $200,405 
Residential real estate
Pass$177,524 $446,985 $209,293 $106,746 $111,601 $650,555 $— $— $1,702,704 
Default— — 392 — 999 1,950 — — 3,341 
Total residential real estate$177,524 $446,985 $209,685 $106,746 $112,600 $652,505 $— $— $1,706,045 
Home equity
Pass$13,376 $64,981 $61,198 $35,075 $31,458 $137,315 $678,867 $1,519 $1,023,789 
Default— — — 122 — 64 1,840 — 2,026 
Total home equity$13,376 $64,981 $61,198 $35,197 $31,458 $137,379 $680,707 $1,519 $1,025,815 
Other consumer (3)
Pass$142 $2,964 $2,469 $1,978 $695 $4,669 $17,074 $— $29,991 
Default— 9 4 — — 3 2 — 18 
Total other consumer$142 $2,973 $2,473 $1,978 $695 $4,672 $17,076 $— $30,009 
Total$665,591 $2,892,632 $2,265,477 $1,265,677 $1,207,151 $3,612,192 $1,669,266 $2,041 $13,580,027 
(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)Loans originated as part of the Paycheck Protection Program ("PPP") established by the Coronavirus Aid, Relief and Economic Security Act (the "CARES Act")t are included within commercial and industrial under the 2021 and 2020 vintage year and "pass" category as these loans are 100% guaranteed by the U.S. Government. Outstanding PPP loans totaled $6.6 million and $99.6 million as of March 31, 2023 and 2022, respectively.
(3)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances and the associated gross write-offs.
Foreclosed Residential Real Estate Property [Table Text Block]
The following table shows information regarding foreclosed residential real estate property at the dates indicated:
March 31, 2023December 31, 2022
(Dollars in thousands)
Foreclosed residential real estate property held by the creditor$— $— 
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure$1,380 $1,615 
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
2023		December 31
2022
Residential real estate portfolio
FICO score (re-scored)(1)752 753 
LTV (re-valued)(2)58.7 %57.0 %
Home equity portfolio
FICO score (re-scored)(1)771 771 
LTV (re-valued)(2)(3)43.8 %41.3 %
(1)The average FICO scores at March 31, 2023 are based upon rescores from March 2023, as available for previously originated loans, or origination score data for loans booked in March 2023.  The average FICO scores at December 31, 2022 were based upon rescores available from December 2022, as available for previously originated loans, or origination score data for loans booked in December 2022.
(2)The combined LTV ratios for March 31, 2023 are based upon updated automated valuations as of February 2023, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2022 were based upon updated automated valuations as of November 2022, 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, 2023
 30-59 days60-89 days90 days or moreTotal Past Due Total
Financing
Receivables		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 industrial5 $339 1 $69 2 $23,472 8 $23,880 $1,626,002 $1,649,882 $— 
Commercial real estate4 785 — — 3 4,846 7 5,631 7,814,463 7,820,094 — 
Commercial construction— — — — — — — — 1,046,310 1,046,310 — 
Small business9 114 4 116 6 140 19 370 225,496 225,866 — 
Residential real estate11 2,202 5 579 15 2,002 31 4,783 2,090,861 2,095,644 — 
Home equity18 1,440 3 81 18 1,343 39 2,864 1,087,891 1,090,755 23 
Other consumer (1)374 353 20 76 6 45 400 474 18,927 19,401 — 
Total421 $5,233 33 $921 50 $31,848 504 $38,002 $13,909,950 $13,947,952 $23 
 December 31, 2022
 30-59 days60-89 days90 days or moreTotal Past Due Total
Financing
Receivables		Recorded
Investment
>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 industrial3 $49 1 $175 3 $23,726 7 $23,950 $1,611,153 $1,635,103 $— 
Commercial real estate7 2,052 5 4,971 3 2,977 15 10,000 7,750,230 7,760,230 — 
Commercial construction— — — — — — — — 1,154,413 1,154,413 — 
Small business12 111 3 25 3 5 18 141 218,961 219,102 — 
Residential real estate8 1,654 8 1,105 16 1,725 32 4,484 2,031,040 2,035,524 — 
Home equity19 1,647 3 201 17 965 39 2,813 1,085,937 1,088,750 — 
Other consumer (1)432 421 15 83 4 28 451 532 35,021 35,553 — 
Total481 $5,934 35 $6,560 46 $29,426 562 $41,920 $13,886,755 $13,928,675 $— 
(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 $5.5 million and $5.0 million at March 31, 2023 and December 31, 2022, respectively.
Financing Receivable, Nonaccrual [Table Text Block]
The following table shows information regarding nonaccrual loans as of the dates indicated:
Nonaccrual Balances
March 31, 2023December 31, 2022
With Allowance for Credit LossesWithout Allowance for Credit LossesTotalWith Allowance for Credit LossesWithout Allowance for Credit LossesTotal (1)
 (Dollars in thousands)
Commercial and industrial$26,045 $298 $26,343 $26,395 $298 $26,693 
Commercial real estate15,324 2,714 18,038 12,961 2,769 15,730 
Small business238 4 242 99 5 104 
Residential real estate8,178 — 8,178 8,479 — 8,479 
Home equity3,282 — 3,282 3,400 — 3,400 
Other consumer129 — 129 475 — 475 
Total nonaccrual loans $53,196 $3,016 $56,212 $51,809 $3,072 $54,881 
(1)Nonaccrual balances at December 31, 2022 included $11.5 million of nonaccruing troubled debt restructures ("TDRs").
Financing Receivable, Troubled Debt Restructuring [Table Text Block]
The following table presents the amortized cost basis at March 31, 2023 of loans modified to borrowers experiencing financial difficulty during the three month period then ended, disaggregated by class of financing receivable and type of modification granted:

Term Extension
Amortized Cost Basis% of Total Class of Financing Receivable
Loan Category(Dollars in thousands)
Commercial real estate$2,540 0.03%
Small business105 0.05%
Total$2,645 
Other-Than-Insignificant Payment Delay
Amortized Cost Basis% of Total Class of Financing Receivable
Loan Category(Dollars in thousands)
Commercial and industrial$2,805 0.17%
Commercial real estate7,013 0.09%
Total$9,818 
Combination - Interest Rate Reduction and Term Extension
Amortized Cost Basis% of Total Class of Financing Receivable
Loan Category(Dollars in thousands)
Small business$44 0.02%
Total$44 

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulty for the period ending 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 loan, which reduced monthly payment amounts for the borrowers.
Small business
Added a weighted-average contractual term of 4.3 years to the life of loans, which reduced monthly payment amounts for the borrowers.
Interest Rate Reduction
Loan CategoryFinancial Effect
Small business
Reduced weighted-average contractual interest rate from 10.00% to 6.50%
Troubled Debt Restructurings On Financing Receivables Post Modifications Table Text Block
Financing Receivable, Modified, Subsequent Default
The following table shows the Company’s total TDRs and other pertinent information as of the date indicated:
December 31, 2022
 (Dollars in thousands)
TDRs on accrual status$11,278 
TDRs on nonaccrual11,520 
Total TDRs$22,798 
There were no new TDRs during the three months ended March 31, 2022.
At March 31, 2023, the Company did not have any additional commitments to lend to borrowers experiencing financial difficulty who were party to a loan modification. At December 31, 2022, the Company had additional commitments to lend to borrowers who had been a party to a TDR of $64,000.
The Company closely monitors the performance of loans modified to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The Company considers a loan to have defaulted when it reaches 90 days past due. During the three months ended March 31, 2023 there were no loans modified to borrowers experiencing financial difficulty that subsequently defaulted, and during the three months ended March 31, 2022, there were no TDRs that were modified during the prior twelve months that subsequently defaulted. Accordingly, all loans modified to borrowers experiencing financial difficulty during the period remained current and were performing in accordance with the modified terms as of March 31, 2023.