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Loans and Allowance for Credit Losses for Loans (Tables)
9 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
Schedule of Loan Portfolio
The detail of the loan portfolio as of September 30, 2020 and December 31, 2019 was as follows: 
 September 30, 2020December 31, 2019
 (in thousands)
Loans:
Commercial and industrial *$6,903,345 $4,825,997 
Commercial real estate:
Commercial real estate16,815,587 15,996,741 
Construction1,720,775 1,647,018 
Total commercial real estate loans18,536,362 17,643,759 
Residential mortgage4,284,595 4,377,111 
Consumer:
Home equity457,083 487,272 
Automobile1,341,659 1,451,623 
Other consumer892,542 913,446 
Total consumer loans2,691,284 2,852,341 
Total loans$32,415,586 $29,699,208 
*Includes $2.3 billion of loans originated under the Paycheck Protection Program (PPP), net of unearned fees totaling $54.4 million at September 30, 2020.
Past Due, Non-Accrual and Current Loans by Loan Portfolio Class
The following table presents past due, current and non-accrual loans without an allowance for credit losses by loan portfolio class (including PCD loans) at September 30, 2020.
Past Due and Non-Accrual Loans
 30-59  Days 
Past Due Loans
60-89  Days 
Past Due Loans
90 Days or More
Past Due Loans
Non-Accrual Loans
Total Past Due Loans

Current Loans

Total Loans
Non-Accrual Loans Without Allowance for Credit Losses
 (in thousands)
September 30, 2020
Commercial and industrial
$6,587 $3,954 $6,759 $115,667 $132,967 $6,770,378 $6,903,345 $16,812 
Commercial real estate:
Commercial real estate
26,038 610 1,538 41,627 69,813 16,745,774 16,815,587 35,798 
Construction142 — — 2,497 2,639 1,718,136 1,720,775 2,405 
Total commercial real estate loans
26,180 610 1,538 44,124 72,452 18,463,910 18,536,362 38,203 
Residential mortgage22,528 3,760 891 23,877 51,056 4,233,539 4,284,595 12,356 
Consumer loans:
Home equity1,281 299 — 6,969 8,549 448,534 457,083 70 
Automobile4,797 808 538 472 6,615 1,335,044 1,341,659 — 
Other consumer2,901 245 215 — 3,361 889,181 892,542 — 
Total consumer loans
8,979 1,352 753 7,441 18,525 2,672,759 2,691,284 70 
Total$64,274 $9,676 $9,941 $191,109 $275,000 $32,140,586 $32,415,586 $67,441 
The following table presents past due, non-accrual and current loans by loan portfolio class at December 31, 2019. At December 31, 2019, purchased credit-impaired (PCI) loans were excluded from past due and non-accrual loans reported because they continued to earn interest income from the accretable yield at the pool level. The PCI loan pools are accounted for as PCD loans (on a loan level basis with a related allowance for credit losses) under the CECL standard adopted at January 1, 2020 and reported in the past due loans and non-accrual loans in the tables above at September 30, 2020.
 Past Due and Non-Accrual Loans  
 
30-59
Days
Past Due Loans
60-89 
Days
Past Due Loans
90 Days or More
Past Due Loans
Non-Accrual Loans
Total Past Due Loans

Current Non-PCI Loans
PCI Loans
(in thousands)
December 31, 2019
Commercial and industrial$11,700 $2,227 $3,986 $68,636 $86,549 $4,057,434 $682,014 
Commercial real estate:
Commercial real estate2,560 4,026 579 9,004 16,169 10,886,724 5,093,848 
Construction1,486 1,343 — 356 3,185 1,492,532 151,301 
Total commercial real estate loans
4,046 5,369 579 9,360 19,354 12,379,256 5,245,149 
Residential mortgage17,143 4,192 2,042 12,858 36,235 3,760,707 580,169 
Consumer loans:
Home equity1,051 80 — 1,646 2,777 373,243 111,252 
Automobile11,482 1,581 681 334 14,078 1,437,274 271 
Other consumer1,171 866 30 224 2,291 900,411 10,744 
Total consumer loans13,704 2,527 711 2,204 19,146 2,710,928 122,267 
Total$46,593 $14,315 $7,318 $93,058 $161,284 $22,908,325 $6,629,599 
Risk Category of Loans
The following table presents the internal loan classification risk by loan portfolio class by origination year (including PCD loans) based on the most recent analysis performed at September 30, 2020:
 Term Loans  
Amortized Cost Basis by Origination Year
September 30, 202020202019201820172016Prior to 2016Revolving Loans Amortized Cost BasisRevolving Loans Converted to Term LoansTotal
 (in thousands)
Commercial and industrial
Risk Rating:
Pass$2,656,655 $609,142 $523,833 $246,684 $185,298 $804,896 $1,613,011 $417 $6,639,936 
Special Mention724 10,634 11,786 10,236 11,310 14,895 44,412 68 104,065 
Substandard5,411 3,181 2,780 1,789 4,095 26,720 18,092 24 62,092 
Doubtful— 5,207 17,162 2,632 72,244 — — 97,252 
Total commercial and industrial$2,662,790 $628,164 $538,406 $275,871 $203,335 $918,755 $1,675,515 $509 $6,903,345 
Commercial real estate
Risk Rating:
Pass$2,456,797 $3,236,056 $2,360,488 $1,993,600 $1,929,677 $4,281,267 $189,008 $15,626 $16,462,519 
Special Mention23,864 — 26,028 7,197 42,882 86,098 3,481 — 189,550 
Substandard17,539 9,450 24,168 22,014 10,329 78,322 — — 161,822 
Doubtful— — — 787 — 909 — — 1,696 
Total commercial real estate$2,498,200 $3,245,506 $2,410,684 $2,023,598 $1,982,888 $4,446,596 $192,489 $15,626 $16,815,587 
Construction
Risk Rating:
Pass$105,422 $157,407 $123,416 $16,196 $47,202 $60,663 $1,162,297 $— $1,672,603 
Special Mention— — — — 10,058 — 32,407 — 42,465 
Substandard— 31 246 2,628 2,422 380 — — 5,707 
Total construction$105,422 $157,438 $123,662 $18,824 $59,682 $61,043 $1,194,704 $— $1,720,775 
The following table presents the amortized cost in those loan classes (including PCD loans) based on payment activity by origination year as of September 30, 2020.
 Term Loans  
Amortized Cost Basis by Origination Year
September 30, 202020202019201820172016Prior to 2016Revolving Loans Amortized Cost BasisRevolving Loans Converted to Term LoansTotal
 (in thousands)
Residential mortgage
Performing$560,875 $807,219 $778,367 $645,289 $407,412 $1,019,903 $52,783 $— $4,271,848 
90 days or more past due— 1,459 2,947 2,849 3,895 1,597 — — 12,747 
Total residential mortgage $560,875 $808,678 $781,314 $648,138 $411,307 $1,021,500 $52,783 $— $4,284,595 
Consumer loans
Home equity
Performing$6,436 $12,015 $13,310 $10,178 $6,505 $17,626 $336,434 $52,986 $455,490 
90 days or more past due— — — — 25 111 617 840 1,593 
Total home equity6,436 12,015 13,310 10,178 6,530 17,737 337,051 53,826 457,083 
Automobile
Performing292,584 479,860 303,799 175,359 62,193 26,843 — — 1,340,638 
90 days or more past due40 304 270 246 16 145 — — 1,021 
Total automobile292,624 480,164 304,069 175,605 62,209 26,988 — — 1,341,659 
Other Consumer
Performing5,061 5,751 11,529 1,254 1,093 6,387 860,895 — 891,970 
90 days or more past due— — — — 20 136 408 572 
Total other consumer5,061 5,751 11,537 1,254 1,093 6,407 861,031 408 892,542 
Total Consumer$304,121 $497,930 $328,916 $187,037 $69,832 $51,132 $1,198,082 $54,234 $2,691,284 

The following table presents the credit exposure by internally assigned risk rating by class of loans (excluding PCI loans) based on the most recent analysis performed at December 31, 2019: 
Credit exposure—
by internally assigned risk rating
 Special  Total Non-PCI
PassMentionSubstandardDoubtfulLoans
 (in thousands)
December 31, 2019
Commercial and industrial$3,982,453 $33,718 $66,511 $61,301 $4,143,983 
Commercial real estate10,781,587 77,884 42,560 862 10,902,893 
Construction1,487,877 7,486 354 — 1,495,717 
Total$16,251,917 $119,088 $109,425 $62,163 $16,542,593 
Schedule Of Recorded Investment In Loan Classes Based On Payment Activity The following table presents the recorded investment in those loan classes based on payment activity as of December 31, 2019:
Credit exposure—
by payment activity
Performing
Loans
Non-Performing
Loans
Total Non-PCI
Loans
 (in thousands)
December 31, 2019
Residential mortgage$3,784,084 $12,858 $3,796,942 
Home equity374,374 1,646 376,020 
Automobile1,451,018 334 1,451,352 
Other consumer902,478 224 902,702 
Total$6,511,954 $15,062 $6,527,016 

The following table summarizes information pertaining to loans that were identified as PCI loans by class based on individual loan payment activity as of December 31, 2019:  
Credit exposure—
by payment activity
Performing
Loans
Non-Performing
Loans
Total Non-PCI
Loans
 (in thousands)
December 31, 2019
Commercial and industrial$653,997 $28,017 $682,014 
Commercial real estate5,065,388 28,460 5,093,848 
Construction148,692 2,609 151,301 
Residential mortgage571,006 9,163 580,169 
Consumer120,356 1,911 122,267 
Total$6,559,439 $70,160 $6,629,599 
Pre-Modification and Post-Modification Outstanding Recorded Investments and Non-PCI Loans that Subsequently Defaulted
The following table presents the pre- and post-modification amortized cost of loans by loan class modified as TDRs (excluding PCI loans prior to the adoption of ASU 2016-13) during the three and nine months ended September 30, 2020 and 2019. Post-modification amounts are presented as of September 30, 2020 and 2019.
Three Months Ended September 30,
20202019
Troubled Debt RestructuringsNumber
of
Contracts
Pre-Modification
Amortized Carrying Amount
Post-Modification
Amortized Carrying Amount
Number
of
Contracts
Pre-Modification
Amortized Carrying Amount
Post-Modification
Amortized Carrying Amount
 ($ in thousands)
Commercial and industrial28 $31,237 $30,938 53 $42,902 $41,772 
Commercial real estate4,249 4,240 75 75 
Residential mortgage247 247 — — — 
Consumer72 72 19 19 
Total32 $35,805 $35,497 55 $42,996 $41,866 


Nine Months Ended September 30,
20202019
Troubled Debt RestructuringsNumber
of
Contracts
Pre-Modification
Amortized Carrying Amount
Post-Modification
Amortized Carrying Amount
Number
of
Contracts
Pre-Modification
Amortized Carrying Amount
Post-Modification
Amortized Carrying Amount
 ($ in thousands)
Commercial and industrial33 $40,537 $38,204 104 $78,601 $72,183 
Commercial real estate8,996 9,000 4,740 4,699 
Residential mortgage247 247 155 154 
Consumer72 72 19 19 
Total39 $49,852 $47,523 109 $83,515 $77,055 
Loans modified as TDRs (excluding PCI loan modifications prior to the adoption of ASU 2016-13) within the previous 12 months and for which there was a payment default (90 or more days past due) for the three and nine months ended September 30, 2020 and 2019 were as follows:
 Three Months Ended September 30,
20202019
Troubled Debt Restructurings Subsequently DefaultedNumber of
Contracts
Amortized CostNumber of
Contracts
Recorded
Investment
 ($ in thousands)
Commercial and industrial30 $17,496 $604 
Residential mortgage— — 154 
Total30 $17,496 $758 
 Nine Months Ended September 30,
20202019
Troubled Debt Restructurings Subsequently DefaultedNumber of
Contracts
Amortized CostNumber of
Contracts
Recorded
Investment
 ($ in thousands)
Commercial and industrial35 $20,099 19 $12,235 
Commercial real estate— — 283 
Residential mortgage— — 369 
Consumer18 18 
Total36 $20,117 24 $12,905 
Summary of Allowance for Credit Losses
The following table summarizes the allowance for credit losses for loans at September 30, 2020 and December 31, 2019: 
September 30,
2020
December 31,
2019
 (in thousands)
Components of allowance for credit losses for loans:
Allowance for loan losses$325,032 $161,759 
Allowance for unfunded credit commitments10,296 2,845 
Total allowance for credit losses for loans$335,328 $164,604 
Summary of Provision for Credit Losses
The following table summarizes the provision for credit losses for loans for the periods indicated:
 Three Months Ended
September 30,
Nine Months Ended
September 30,
 2020201920202019
 (in thousands)
Components of provision for credit losses for loans:
Provision for loan losses$30,833 $8,757 $105,709 $20,319 
Provision for unfunded credit commitments187 (57)350 (1,519)
Total provision for credit losses for loans$31,020 $8,700 $106,059 $18,800 
Summary of Collateral Dependent Loans
The following table presents collateral dependent loans by class as of September 30, 2020:
 September 30,
2020
 (in thousands)
Commercial and industrial$115,877 
Commercial real estate:
Commercial real estate44,638 
Construction2,405 
Total commercial real estate loans
47,043 
Residential mortgage28,856 
Home equity88 
Total $191,864 
Summary of Activity in Allowance for Loan Losses
The following table details the activity in the allowance for loan losses by loan portfolio segment for the three and nine months ended September 30, 2020 and 2019: 
Commercial
and Industrial
Commercial
Real Estate
Residential
Mortgage
ConsumerTotal
 (in thousands)
Three Months Ended
September 30, 2020
Allowance for loan losses:
Beginning balance$132,039 $131,702 $29,630 $16,243 $309,614 
Loans charged-off(13,965)(695)(7)(2,458)(17,125)
Charged-off loans recovered 428 100 31 1,151 1,710 
Net (charge-offs) recoveries(13,537)(595)24 (1,307)(15,415)
Provision for loan losses11,907 13,543 (1,040)6,423 30,833 
Ending balance$130,409 $144,650 $28,614 $21,359 $325,032 
Three Months Ended
September 30, 2019
Allowance for losses:
Beginning balance$94,384 $48,978 $5,219 $6,524 $155,105 
Loans charged-off (527)(158)(111)(2,191)(2,987)
Charged-off loans recovered 330 28 617 978 
Net charge-offs(197)(130)(108)(1,574)(2,009)
Provision for loan losses6,815 (77)191 1,828 8,757 
Ending balance$101,002 $48,771 $5,302 $6,778 $161,853 

Commercial
and Industrial
Commercial
Real Estate
Residential
Mortgage
ConsumerTotal
 (in thousands)
Nine Months Ended
September 30, 2020
Allowance for loan losses:
Beginning balance$104,059 $45,673 $5,060 $6,967 $161,759 
Impact of ASU 2016-13 adoption*15,169 49,797 20,575 6,990 92,531 
Loans charged-off(31,349)(766)(348)(7,624)(40,087)
Charged-off loans recovered 1,796 244 626 2,454 5,120 
Net (charge-offs) recoveries(29,553)(522)278 (5,170)(34,967)
Provision for loan losses40,734 49,702 2,701 12,572 105,709 
Ending balance$130,409 $144,650 $28,614 $21,359 $325,032 
Nine Months Ended
September 30, 2019
Allowance for losses:
Beginning balance$90,956 $49,650 $5,041 $6,212 $151,859 
Loans charged-off (7,882)(158)(126)(5,971)(14,137)
Charged-off loans recovered 2,008 71 13 1,720 3,812 
Net charge-offs(5,874)(87)(113)(4,251)(10,325)
Provision for loan losses15,920 (792)374 4,817 20,319 
Ending balance$101,002 $48,771 $5,302 $6,778 $161,853 
*    Includes a $61.6 million increase representing the estimated expected credit losses for PCD loans as a result of the adoption of CECL on January 1, 2020.
Summary of Allocation of Allowance for Loan Losses and Related Loans by Loan Portfolio Segment Disaggregated Based on Allowance Measurement Methodology
The following table represents the allocation of the allowance for loan losses and the related loans by loan portfolio segment disaggregated based on the allowance measurement methodology at September 30, 2020 and December 31, 2019.
Commercial
and Industrial
Commercial
Real Estate
Residential
Mortgage
ConsumerTotal
 (in thousands)
September 30, 2020
Allowance for loan losses:
Individually evaluated for credit losses
$66,444 $2,058 $830 $1,232 $70,564 
Collectively evaluated for credit losses
63,965 142,592 27,784 20,127 254,468 
Total$130,409 $144,650 $28,614 $21,359 $325,032 
Loans:
Individually evaluated for credit losses
$136,696 $70,145 $35,551 $4,019 $246,411 
Collectively evaluated for credit losses
6,766,649 18,466,217 4,249,044 2,687,265 32,169,175 
Total$6,903,345 $18,536,362 $4,284,595 $2,691,284 $32,415,586 
December 31, 2019
Allowance for loan losses:
Individually evaluated for credit losses
$36,662 $1,338 $518 $58 $38,576 
Collectively evaluated for credit losses
67,397 44,335 4,542 6,909 123,183 
Total$104,059 $45,673 $5,060 $6,967 $161,759 
Loans:
Individually evaluated for credit losses
$100,860 $51,242 $10,689 $853 $163,644 
Collectively evaluated for credit losses
4,043,123 12,347,368 3,786,253 2,729,221 22,905,965 
Loans acquired with discounts related to credit quality
682,014 5,245,149 580,169 122,267 6,629,599 
Total$4,825,997 $17,643,759 $4,377,111 $2,852,341 $29,699,208 
Schedule of Impaired Loans by Portfolio Class
The following table presents information about impaired loans by loan portfolio class at December 31, 2019:
Recorded
Investment
With No
Related
Allowance
Recorded
Investment
With
Related
Allowance
Total
Recorded
Investment
Unpaid
Contractual
Principal
Balance
Related
Allowance
 (in thousands)
December 31, 2019
Commercial and industrial$14,617 $86,243 $100,860 $114,875 $36,662 
Commercial real estate:
Commercial real estate26,046 24,842 50,888 51,258 1,338 
Construction354 — 354 354 — 
Total commercial real estate loans26,400 24,842 51,242 51,612 1,338 
Residential mortgage5,836 4,853 10,689 11,800 518 
Consumer loans:
Home equity366 487 853 956 58 
Total consumer loans366 487 853 956 58 
Total$47,219 $116,425 $163,644 $179,243 $38,576 
Schedule Of Accretable Yield For PCI Loans
The table below includes disclosure requirements prior to the adoption of ASU No. 2016-13 on January 1, 2020, and presents the changes in the accretable yield for PCI loans during the three and nine months ended September 30, 2019:
 Three Months Ended
September 30, 2019
Nine Months Ended
September 30, 2019
 (in thousands)
Balance, beginning of period$853,887 $875,958 
Accretion(47,475)(155,981)
Net (decrease) increase in expected cash flows(58,268)28,167 
Balance, end of period$748,144 $748,144