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Loans, Allowance for Credit Losses and Credit Quality (Tables)
 3 Months Ended
Mar. 31, 2022
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, 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 
(Release of) provision for 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 
Three Months Ended March 31, 2021
(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$21,086 $45,009 $5,397 $5,095 $14,275 $22,060 $470 $113,392 
Charge-offs(3,331)— — (66)— — (289)(3,686)
Recoveries64 57 — 11 1 13 197 343 
(Release of) provision for credit losses2,388 (718)(129)(1,419)(1,320)(1,357)55 (2,500)
Ending balance (1)$20,207 $44,348 $5,268 $3,621 $12,956 $20,716 $433 $107,549 
(1)Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $39.4 million and $33.4 million as of March 31, 2022 and March 31, 2021, 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, 2022
20222021202020192018PriorRevolving 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 unlikely 403 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
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 
March 31, 2021
20212020201920182017PriorRevolving LoansRevolving converted to TermTotal (1)
(Dollars in thousands)
Commercial and
industrial
Pass (2)$420,682 $724,577 $127,454 $88,970 $25,737 $27,123 $589,448 $— $2,003,991 
Potential weakness3,424 14,991 2,636 2,148 4,288 3,205 12,252 — 42,944 
Definite weakness - loss unlikely17,912 663 1,116 1,327 2,768 482 6,927 — 31,195 
Partial loss probable— — — — — 143 8,398 — 8,541 
Definite loss— — — — — — — — — 
Total commercial and industrial$442,018 $740,231 $131,206 $92,445 $32,793 $30,953 $617,025 $— $2,086,671 
Commercial real estate
Pass$214,573 $1,043,424 $687,959 $432,728 $524,194 $966,331 $16,196 $— $3,885,405 
Potential weakness390 29,218 53,849 31,274 18,981 86,160 13,612 — 233,484 
Definite weakness - loss unlikely3,590 22,536 3,754 3,474 9,892 15,482 — — 58,728 
Partial loss probable— — — — — — — — — 
Definite loss— — — — — — — — — 
Total commercial real estate$218,553 $1,095,178 $745,562 $467,476 $553,067 $1,067,973 $29,808 $— $4,177,617 
Commercial construction
Pass$28,323 $239,954 $142,076 $28,189 $23,313 $6,628 $19,934 $— $488,417 
Potential weakness— 17,544 9,691 — — — 190 — 27,425 
Definite weakness - loss unlikely— — — 520 — — — — 520 
Partial loss probable— — — — — — — — — 
Definite loss— — — — — — — — — 
Total commercial construction$28,323 $257,498 $151,767 $28,709 $23,313 $6,628 $20,124 $— $516,362 
Small business
Pass$10,307 $41,418 $25,817 $17,750 $12,624 $29,309 $33,658 $— $170,883 
Potential weakness— — 389 204 10 202 634 — 1,439 
Definite weakness - loss unlikely— 677 51 59 17 301 758 — 1,863 
Partial loss probable— — — — — — 26 — 26 
Definite loss— — — — — — — — — 
Total small business$10,307 $42,095 $26,257 $18,013 $12,651 $29,812 $35,076 $— $174,211 
Residential real estate
Pass$80,657 $212,891 $126,359 $133,150 $130,580 $554,848 $— $— $1,238,485 
Default— — — 427 — 2,877 — — 3,304 
Total residential real estate$80,657 $212,891 $126,359 $133,577 $130,580 $557,725 $— $— $1,241,789 
Home equity
Pass$23,583 $77,497 $51,398 $46,648 $48,132 $140,376 $636,881 $1,762 $1,026,277 
Default— — — — — 210 2,008 — 2,218 
Total home equity$23,583 $77,497 $51,398 $46,648 $48,132 $140,586 $638,889 $1,762 $1,028,495 
Other consumer
Pass$46 $540 $326 $146 $620 $6,800 $12,939 $— $21,417 
Default— — — — 15 111 3 — 129 
Total other consumer$46 $540 $326 $146 $635 $6,911 $12,942 $— $21,546 
Total$803,487 $2,425,930 $1,232,875 $787,014 $801,171 $1,840,588 $1,353,864 $1,762 $9,246,691 
(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 CARES Act 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 $99.6 million and $846.3 million as of March 31, 2022 and 2021, respectively.
Foreclosed Residential Real Estate Property [Table Text Block] The following table shows information regarding foreclosed residential real estate property at the dates indicated:
March 31, 2022December 31, 2021
(Dollars in thousands)
Foreclosed residential real estate property held by the creditor$— $— 
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure$2,287 $1,426 
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
2022		December 31
2021
Residential real estate portfolio
FICO score (re-scored)(1)752 749 
LTV (re-valued)(2)54.5 %54.4 %
Home equity portfolio
FICO score (re-scored)(1)773 772 
LTV (re-valued)(2)(3)42.3 %42.4 %
(1)The average FICO scores at March 31, 2022 are based upon rescores from March 2022, as available for previously originated loans, or origination score data for loans booked in March 2022.  The average FICO scores at December 31, 2021 were based upon rescores available from December 2021, as available for previously originated loans, or origination score data for loans booked in December 2021.
(2)The combined LTV ratios for March 31, 2022 are based upon updated automated valuations as of February 2022, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2021 were based upon updated automated valuations as of November 2021, 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, 2022
 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 industrial4 $276 4 $3,399 — $— 8 $3,675 $1,562,517 $1,566,192 $— 
Commercial real estate10 6,530 3 7,897 2 7,009 15 21,436 7,876,180 7,897,616 — 
Commercial construction3 2,592 — — — — 3 2,592 1,151,353 1,153,945 — 
Small business7 85 2 6 2 8 11 99 200,306 200,405 — 
Residential real estate9 2,890 6 1,546 73 3,341 88 7,777 1,698,268 1,706,045 — 
Home equity11 834 5 81 23 2,026 39 2,941 1,022,874 1,025,815 — 
Other consumer (1)384 541 18 157 8 18 410 716 29,293 30,009 — 
Total428 $13,748 38 $13,086 108 $12,402 574 $39,236 $13,540,791 $13,580,027 $— 
 December 31, 2021
 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 industrial7 $143 2 $252 2 $24 11 $419 $1,562,860 $1,563,279 $— 
Commercial real estate15 32,845 — — 4 1,339 19 34,184 7,958,160 7,992,344 — 
Commercial construction— — — — — — — — 1,165,457 1,165,457 — 
Small business11 136 6 53 4 24 21 213 192,976 193,189 — 
Residential real estate12 2,709 5 714 76 3,922 93 7,345 1,597,341 1,604,686 — 
Home equity15 1,375 6 381 21 1,671 42 3,427 1,036,184 1,039,611 — 
Other consumer (1)458 719 41 277 16 112 515 1,108 27,612 28,720 — 
Total518 $37,927 60 $1,677 123 $7,092 701 $46,696 $13,540,590 $13,587,286 $— 
(1)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.
Financing Receivable, Nonaccrual [Table Text Block]
The following table shows information regarding nonaccrual loans as of the dates indicated:
Nonaccrual Balances
March 31, 2022December 31, 2021
With Allowance for Credit LossesWithout Allowance for Credit LossesTotalWith Allowance for Credit LossesWithout Allowance for Credit LossesTotal
 (Dollars in thousands)
Commercial and industrial$3,498 $19 $3,517 $3,420 $19 $3,439 
Commercial real estate15,835 24,635 40,470 10,870 — 10,870 
Small business20 — 20 44 — 44 
Residential real estate7,861 596 8,457 8,580 602 9,182 
Home equity3,761 — 3,761 3,781 — 3,781 
Other consumer393 — 393 504 — 504 
Total nonaccrual loans (1)$31,368 $25,250 $56,618 $27,199 $621 $27,820 
(1)Included in these amounts were $2.0 million of nonaccruing TDRs at both March 31, 2022 and December 31, 2021, respectively.
Financing Receivable, Troubled Debt Restructuring [Table Text Block]
The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated:
March 31, 2022December 31, 2021
 (Dollars in thousands)
TDRs on accrual status$13,288 $14,635 
TDRs on nonaccrual1,972 1,993 
Total TDRs$15,260 $16,628 
Additional commitments to lend to a borrower who has been a party to a TDR$174 $190 
Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods [Table Text Block] The following table shows the TDRs which occurred during the three months ended March 31, 2021 and the change in the recorded investment subsequent to the modifications occurring:
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
 (Dollars in thousands)
Troubled debt restructurings
Commercial and industrial1 $14,148 $14,148 
Commercial real estate5 3,964 3,964 
Small business1 100 100 
Total (1)7 $18,212 $18,212 
(1)The pre-modification and post-modification balances represent the legal principal balance of the loan. During the three months ended March 31, 2021, there were two relationships amounting to $14.3 million that related to additional modifications on previously existing TDRs.
Troubled Debt Restructurings On Financing Receivables Post Modifications Table Text Block
The following table shows the Company’s post-modification balance of TDRs listed by type of modification for the three months ended March 31, 2021:
Post-Modification Balance of TDRs
 (Dollars in thousands)
Combination rate and maturity14,148 
Extended maturity4,064 
Total$18,212