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Loans, Allowance for Credit Losses and Credit Quality (Tables)
 9 Months Ended
Sep. 30, 2020
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 September 30, 2020
 (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$25,662 $36,956 $4,501 $4,561 $15,046 $24,860 $590 $112,176 
Charge-offs(185)(3,885)— (49)— — (185)(4,304)
Recoveries1 9 — 2 1 21 219 253 
Provision for credit loss expense2,741 6,306 709 79 (884)(1,309)(142)7,500 
Ending balance (1)$28,219 $39,386 $5,210 $4,593 $14,163 $23,572 $482 $115,625 
 Nine Months Ended September 30, 2020
 (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, pre adoption of Topic 326 $17,594 $32,935 $6,053 $1,746 $3,440 $5,576 $396 $67,740 
Cumulative effect accounting adjustment (2)(1,984)(13,048)(3,652)495 9,828 7,012 212 (1,137)
Cumulative effect accounting adjustment (3)49 337 — — 423 319 29 1,157 
Charge-offs(185)(3,885)— (194)— (142)(1,342)(5,748)
Recoveries47 9 — 8 2 174 873 1,113 
Provision for credit loss expense12,698 23,038 2,809 2,538 470 10,633 314 52,500 
Ending balance (1)$28,219 $39,386 $5,210 $4,593 $14,163 $23,572 $482 $115,625 
(1)Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $36.7 million as of September 30, 2020.
(2)Represents adjustment needed to reflect the cumulative day one impact pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for credit losses resulting from the Company's adoption of the standard.
(3)Represents adjustment needed to reflect the day one reclassification of the Company's PCI loan balances to PCD and the associated gross-up, pursuant to the Company's adoption of Accounting Standards Update 2016-13. The adjustment represents a $1.2 million increase to the allowance resulting from the day one reclassification.
The following table summarizes changes in allowance for loan losses by loan category for the periods indicated:
Three Months Ended September 30, 2019
(Dollars in thousands)
Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Small
Business		Residential
Real Estate
Home Equity		Other ConsumerTotal
Allowance for loan losses
Beginning balance$16,857 $32,660 $5,593 $1,768 $3,296 $5,547 $239 $65,960 
Charge-offs— (82)— (125)— (28)(472)(707)
Recoveries1,003 106 — 61 140 194 185 1,689 
Provision (benefit)(528)(33)240 48 (88)36 325 — 
Ending balance$17,332 $32,651 $5,833 $1,752 $3,348 $5,749 $277 $66,942 
Nine Months Ended September 30, 2019
(Dollars in thousands)
Commercial and
Industrial		Commercial
Real Estate		Commercial
Construction		Small
Business		Residential
Real Estate
Home Equity		Other ConsumerTotal
Allowance for loan losses
Beginning balance$15,760 $32,370 $5,158 $1,756 $3,219 $5,608 $422 $64,293 
Charge-offs— (82)— (319)— (212)(1,125)(1,738)
Recoveries1,127 152 — 108 141 278 581 2,387 
Provision (benefit)445 211 675 207 (12)75 399 2,000 
Ending balance$17,332 $32,651 $5,833 $1,752 $3,348 $5,749 $277 $66,942 
Ending balance: collectively evaluated for impairment$17,326 $32,610 $5,833 $1,741 $2,729 $5,594 $272 $66,105 
Ending balance: individually evaluated for impairment$6 $41 $— $11 $619 $155 $5 $837 
Financing Receivable Credit Quality Indicators [Table Text Block] he following table details the amortized cost balances of the Company's loan portfolios, presented by credit quality indicator and origination year as of the date indicated below:
 September 30, 2020
20202019201820172016PriorRevolving LoansRevolving converted to TermTotal
 (Dollars in thousands)
Commercial and
industrial
Pass$1,012,974 (1)$153,137 $107,318 $34,826 $23,065 $22,334 $601,937 $2,577 $1,958,168 
Potential weakness2,560 2,302 7,833 4,573 1,219 318 15,248 50 34,103 
Definite weakness - loss unlikely2,732 1,553 22,748 5,500 2,483 1,419 33,496 — 69,931 
Partial loss probable— — — — — 143 — — 143 
Definite loss— — — — — — — — — 
Total commercial and industrial$1,018,266 $156,992 $137,899 $44,899 $26,767 $24,214 $650,681 $2,627 $2,062,345 
Commercial real estate
Pass$753,415 $859,548 $512,371 $587,345 $399,442 $751,629 $39,998 $16,341 $3,920,089 
Potential weakness20,639 15,957 20,313 7,941 27,253 47,875 — — 139,978 
Definite weakness - loss unlikely4,261 2,265 10,092 21,081 2,170 6,605 — — 46,474 
Partial loss probable— — 18,923 — — — — — 18,923 
Definite loss— — — — — — — — — 
Total commercial real estate$778,315 $877,770 $561,699 $616,367 $428,865 $806,109 $39,998 $16,341 $4,125,464 
Commercial construction
Pass$182,291 $196,420 $73,298 $66,406 $— $6,750 $31,372 $1,077 $557,614 
Potential weakness— 9,352 5,037 — — — 328 — 14,717 
Definite weakness - loss unlikely— — 1,003 — — — — — 1,003 
Partial loss probable— — — — — — — — — 
Definite loss— — — — — — — — — 
Total commercial construction$182,291 $205,772 $79,338 $66,406 $— $6,750 $31,700 $1,077 $573,334 
Small business
Pass$27,457 $28,766 $20,806 $14,627 $14,528 $22,644 $34,569 $— $163,397 
Potential weakness— 10 16 10 755 232 736 — 1,759 
Definite weakness - loss unlikely184 408 78 170 98 723 786 — 2,447 
Partial loss probable— — — — — — 29 — 29 
Definite loss— — — — — — — — — 
Total small business$27,641 $29,184 $20,900 $14,807 $15,381 $23,599 $36,120 $— $167,632 
Residential real estate
Pass$131,691 $167,901 $187,194 $168,048 $241,638 $449,219 $— $— $1,345,691 
Default728 — 760 235 167 4,724 — — 6,614 
Total residential real estate$132,419 $167,901 $187,954 $168,283 $241,805 $453,943 $— $— $1,352,305 
Home equity
Pass$60,274 $66,238 $59,534 $59,387 $44,817 $122,397 $681,784 $4,057 $1,098,488 
Default— — — — — 455 2,044 67 2,566 
Total home equity$60,274 $66,238 $59,534 $59,387 $44,817 $122,852 $683,828 $4,124 $1,101,054 
Other consumer
Pass$679 $450 $209 $739 $696 $7,737 $12,493 $— $23,003 
Default— — — 20 — 34 2 — 56 
Total other consumer$679 $450 $209 $759 $696 $7,771 $12,495 $— $23,059 
Total$2,199,885 $1,504,307 $1,047,533 $970,908 $758,331 $1,445,238 $1,454,822 $24,169 $9,405,193 
The following tables detail the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s loan portfolio as of December 31, 2019:
  December 31, 2019
CategoryRisk
Rating		Commercial  and
Industrial		Commercial
Real Estate		Commercial
Construction		Small BusinessTotal
  (Dollars in thousands)
Pass1 - 6$1,274,155 $3,860,555 $542,608 $171,213 $5,848,531 
Potential weakness763,485 97,268 2,247 1,416 164,416 
Definite weakness-loss unlikely857,396 44,536 2,438 1,868 106,238 
Partial loss probable9— — — — — 
Definite loss10— — — — — 
Total$1,395,036 $4,002,359 $547,293 $174,497 $6,119,185 
Foreclosed Residential Real Estate Property [Table Text Block] The following table shows information regarding foreclosed residential real estate property at the dates indicated:
September 30, 2020December 31, 2019
(Dollars in thousands)
Foreclosed residential real estate property held by the creditor$— $— 
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure$2,113 $3,294 
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:
September 30
2020		December 31
2019
Residential portfolio
FICO score (re-scored)(1)749 749 
LTV (re-valued)(2)57.7 %59.0 %
Home equity portfolio
FICO score (re-scored)(1)770 767 
LTV (re-valued)(2)(3)46.6 %46.6 %
(1)The average FICO scores at September 30, 2020 are based upon rescores available from August 2020 and origination score data for loans booked in September 2020.  The average FICO scores at December 31, 2019 were based upon rescores available from November 2019 and origination score data for loans booked in December 2019.
(2)The combined LTV ratios for September 30, 2020 are based upon updated automated valuations as of August 2020, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2019 were based upon updated automated valuations as of November 2019, 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:
 September 30, 2020
 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 industrial1 $52 6 $3,608 5 $930 12 $4,590 $2,057,755 $2,062,345 $— 
Commercial real estate1 99 2 8,269 5 1,355 8 9,723 4,115,741 4,125,464 — 
Commercial construction— — — — — — — — 573,334 573,334 — 
Small business6 514 4 455 12 124 22 1,093 166,539 167,632 — 
Residential real estate11 1,792 7 1,631 37 5,870 55 9,293 1,343,012 1,352,305 — 
Home equity18 1,581 8 468 36 2,566 62 4,615 1,096,439 1,101,054 — 
Other consumer (1)237 217 3 1 12 57 252 275 22,784 23,059 1 
Total274 $4,255 30 $14,432 107 $10,902 411 $29,589 $9,375,604 $9,405,193 $1 
 December 31, 2019
 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 industrial1 $253 2 $323 5 $760 8 $1,336 $1,393,700 $1,395,036 $— 
Commercial real estate7 1,690 1 194 8 2,038 16 3,922 3,998,437 4,002,359 218 (2)
Commercial construction1 560 — — — — 1 560 546,733 547,293 — 
Small business11 837 3 15 6 115 20 967 173,530 174,497 — 
Residential real estate17 2,237 17 3,055 38 7,020 72 12,312 1,578,257 1,590,569 1,652 (2)
Home equity23 1,689 8 524 40 3,854 71 6,067 1,127,731 1,133,798 265 (2)
Other consumer (1)387 245 12 44 16 32 415 321 29,766 30,087 22 
Total447 $7,511 43 $4,155 113 $13,819 603 $25,485 $8,848,154 $8,873,639 $2,157 
(1)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.
(2)Represents purchased credit impaired ("PCI") loans that were accruing interest due to expectations of future cash collections.
Financing Receivable, Nonaccrual [Table Text Block]
The following table shows information regarding nonaccrual loans as of the dates indicated:
Nonaccrual Balances
September 30, 2020December 31, 2019
With Allowance for Credit LossesWithout Allowance for Credit LossesTotalTotal
 (Dollars in thousands)
Commercial and industrial$17,816 $19,035 $36,851 $22,574 
Commercial real estate17,501 20,663 38,164 3,016 
Small business542 — 542 311 
Residential real estate13,379 2,850 16,229 13,360 
Home equity6,052 107 6,159 6,570 
Other consumer79 — 79 61 
Total nonaccrual loans (1)$55,369 $42,655 $98,024 $45,892 
(1)Included in these amounts were $23.8 million and $24.8 million of nonaccruing TDRs at September 30, 2020 and December 31, 2019, re
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:
September 30, 2020December 31, 2019
 (Dollars in thousands)
TDRs on accrual status$17,521 $19,599 
TDRs on nonaccrual23,810 24,766 
Total TDRs$41,331 $44,365 
Amount of specific reserves associated with TDRsn/a$855 
Additional commitments to lend to a borrower who has been a party to a TDR$158 $63 
Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods [Table Text Block]
The following table shows the troubled debt restructurings which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring:
 Three Months EndedNine Months Ended
September 30, 2020September 30, 2020
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment 		Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
 (Dollars in thousands)
Troubled debt restructurings
Commercial and industrial2 $83 $83 5 $391 $391 
Commercial real estate3 744 744 8 2,518 2,518 
Small business— — — 2 112 88 
Residential real estate— — — 2 559 642 
Total5 $827 $827 17 $3,580 $3,639 
 Three Months EndedNine Months Ended
September 30, 2019September 30, 2019
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment 		Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
 (Dollars in thousands)
Troubled debt restructurings
Commercial and industrial1 $87 $87 2 $184 $184 
Commercial real estate1 133 133 2 283 283 
Small business1 19 19 2 33 33 
Residential real estate1 163 168 1 163 168 
Home equity1 46 46 2 121 121 
Total5 $448 $453 9 $784 $789 
Troubled Debt Restructurings On Financing Receivables Post Modifications Table Text Block
 Three Months EndedNine Months Ended
September 30, 2019September 30, 2019
 Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment 		Number of
Contracts		Pre-Modification
Outstanding
Recorded
Investment		Post-Modification
Outstanding
Recorded
Investment
 (Dollars in thousands)
Troubled debt restructurings
Commercial and industrial1 $87 $87 2 $184 $184 
Commercial real estate1 133 133 2 283 283 
Small business1 19 19 2 33 33 
Residential real estate1 163 168 1 163 168 
Home equity1 46 46 2 121 121 
Total5 $448 $453 9 $784 $789 
The following table shows the Company’s post-modification balance of TDRs listed by type of modification for the periods indicated:
Three Months EndedNine Months Ended
 September 30September 30
 2020201920202019
 (Dollars in thousands)
Adjusted interest rate218 — $822 $150 
Court ordered concession— — 25 75 
Extended maturity609 453 2,792 606 
Total827 453 $3,639 $831