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Loans and Allowance for Credit Losses for Loans (Tables)
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Schedule of Loan Portfolio
The detail of the loan portfolio as of December 31, 2020 and 2019 was as follows: 
 20202019
 (in thousands)
Loans:
Commercial and industrial *$6,861,708 $4,825,997 
Commercial real estate:
Commercial real estate16,724,998 15,996,741 
Construction1,745,825 1,647,018 
Total commercial real estate loans
18,470,823 17,643,759 
Residential mortgage4,183,743 4,377,111 
Consumer:
Home equity431,553 487,272 
Automobile1,355,955 1,451,623 
Other consumer913,330 913,446 
Total consumer loans2,700,838 2,852,341 
Total loans$32,217,112 $29,699,208 
*    Includes $2.2 billion of loans originated under the SBA Paycheck Protection Program (PPP), net of unearned fees totaling $43.2 million at December 31, 2020.
Changes in Amounts of Loans and Advances to the Related Parties
The following table summarizes the changes in the total amounts of loans and advances to the related parties during the year ended December 31, 2020: 
 2020
 (in thousands)
Outstanding at beginning of year$193,281 
New loans and advances71,356 
Repayments(25,012)
Outstanding at end of year$239,625 
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 December 31, 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)
December 31, 2020
Commercial and industrial$6,393 $2,252 $9,107 $106,693 $124,445 $6,737,263 $6,861,708 $4,075 
Commercial real estate:
Commercial real estate35,030 1,326 993 46,879 84,228 16,640,770 16,724,998 32,416 
Construction315 — — 84 399 1,745,426 1,745,825 — 
Total commercial real estate loans
35,345 1,326 993 46,963 84,627 18,386,196 18,470,823 32,416 
Residential mortgage17,717 10,351 3,170 25,817 57,055 4,126,688 4,183,743 11,610 
Consumer loans:
Home equity953 492 — 4,936 6,381 425,172 431,553 50 
Automobile8,056 1,107 245 338 9,746 1,346,209 1,355,955 — 
Other consumer1,248 224 26 535 2,033 911,297 913,330 — 
Total consumer loans10,257 1,823 271 5,809 18,160 2,682,678 2,700,838 50 
Total$69,712 $15,752 $13,541 $185,282 $284,287 $31,932,825 $32,217,112 $48,151 
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 table above at December 31, 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		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 loans4,046 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 December 31, 2020:
 Term Loans  
Amortized Cost Basis by Origination Year
December 31, 202020202019201820172016Prior to 2016Revolving Loans Amortized Cost BasisRevolving Loans Converted to Term LoansTotal
 (in thousands)
Commercial and industrial
Risk Rating:
Pass$3,058,596 $605,112 $556,284 $212,215 $162,483 $337,484 $1,677,559 $350 $6,610,083 
Special Mention819 10,236 2,135 9,502 10,228 14,165 49,883 51 97,019 
Substandard5,215 3,876 12,481 1,798 4,215 12,965 18,913 462 59,925 
Doubtful— 5,203 1 17,010 2,596 69,871 — — 94,681 
Total commercial and industrial$3,064,630 $624,427 $570,901 $240,525 $179,522 $434,485 $1,746,355 $863 $6,861,708 
Commercial real estate
Risk Rating:
Pass$3,096,549 $3,052,076 $2,230,047 $1,767,528 $1,798,137 $3,916,990 $199,145 $15,532 $16,076,004 
Special Mention50,193 68,203 44,336 48,813 66,845 109,295 1,705 — 389,390 
Substandard18,936 17,049 30,997 59,618 11,541 118,725 2,531 — 259,397 
Doubtful— — — — — 207 — — 207 
Total commercial real estate$3,165,678 $3,137,328 $2,305,380 $1,875,959 $1,876,523 $4,145,217 $203,381 $15,532 $16,724,998 
Construction
Risk Rating:
Pass$145,246 $120,800 $111,174 $15,497 $47,971 $20,029 $1,199,034 $— $1,659,751 
Special Mention— 1,043 — — 9,996 17,414 47,311 — 75,764 
Substandard— 26 246 2,628 17 380 7,013 — 10,310 
Total construction$145,246 $121,869 $111,420 $18,125 $57,984 $37,823 $1,253,358 $— $1,745,825 
The following table presents the amortized cost in those loan classes (including PCD loans) based on payment activity by origination year as of December 31, 2020:
 Term Loans  
Amortized Cost Basis by Origination Year
December 31, 202020202019201820172016Prior to 2016Revolving Loans Amortized Cost BasisRevolving Loans Converted to Term LoansTotal
 (in thousands)
Residential mortgage
Performing$730,764 $778,161 $684,761 $582,650 $380,723 $943,616 $64,798 $— $4,165,473 
90 days or more past due— 3,085 4,212 3,464 4,144 3,365 — — 18,270 
Total residential mortgage $730,764 $781,246 $688,973 $586,114 $384,867 $946,981 $64,798 $— $4,183,743 
Consumer loans
Home equity
Performing$8,580 $10,634 $11,756 $8,886 $5,340 $15,393 $318,869 $50,879 $430,337 
90 days or more past due— — — — 25 83 378 730 1,216 
Total home equity8,580 10,634 11,756 8,886 5,365 15,476 319,247 51,609 431,553 
Automobile
Performing426,121 438,181 272,075 151,523 50,853 16,550 — — 1,355,303 
90 days or more past due19 108 173 223 35 94 — — 652 
Total automobile426,140 438,289 272,248 151,746 50,888 16,644 — — 1,355,955 
Other Consumer
Performing12,271 5,558 6,815 1,112 1,077 5,314 880,748 — 912,895 
90 days or more past due— — — — — 22 5 408 435 
Total other consumer12,271 5,558 6,815 1,112 1,077 5,336 880,753 408 913,330 
Total Consumer$446,991 $454,481 $290,819 $161,744 $57,330 $37,456 $1,200,000 $52,017 $2,700,838 

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 
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 presents the recorded investment in PCI loans by class based on individual loan payment activity as of December 31, 2019: 
Credit exposure—PerformingNon-PerformingTotal
by payment activityLoansLoansPCI 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 $6,629,599 
Pre-Modification and Post-Modification Outstanding Recorded Investments and Non-PCI Loans that Subsequently Defaulted
The following table presents pre- and post-modification amortized cost of loans by loan class modified as TDRs (excluding PCI loans prior to the adoption of ASU 2016-13) during the years ended December 31, 2020 and 2019. The pre-modification and post-modification outstanding recorded investments disclosed in the table below represent the loan carrying amounts immediately prior to the modification and the carrying amounts at December 31, 2020 and 2019, respectively.
Troubled Debt
Restructurings		Number of
Contracts		Pre-Modification
Outstanding
Recorded Investment		Post-Modification
Outstanding
Recorded Investment
  ($ in thousands)
December 31, 2020
Commercial and industrial42 $46,090 $42,679 
Commercial real estate6 24,683 21,654 
Residential mortgage12 2,377 2,323 
Consumer1 72 70 
Total61 $73,222 $66,726 
December 31, 2019
Commercial and industrial111 $77,781 $73,503 
Commercial real estate2 3,143 3,098 
Residential mortgage2 376 374 
Consumer2 215 207 
Total117 $81,515 $77,182 
Loans modified as TDRs (excluding PCI loan modifications prior to the adoption of ASU 2016-13) in the years ended December 31, 2020 and 2019, and for which there was a payment default (90 or more days past due) were as follows:
 Years Ended December 31,
20202019
Troubled Debt Restructurings Subsequently DefaultedNumber of
Contracts		Recorded
Investment		Number of
Contracts		Recorded
Investment
 ($ in thousands)
Commercial and industrial27 $23,247 43 $31,782 
Residential mortgage1 247 1 154 
Total28 $23,494 44 $31,936 
Summary of Collateral Dependent Loans
The following table presents collateral dependent loans by class as of December 31, 2020:
 2020
 (in thousands)
Commercial and industrial$106,239 
Commercial real estate41,562 
Residential mortgage28,176 
Home equity50 
Total $176,027 
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 changes in the accretable yield for PCI loans for the year ended December 31, 2019:
2019
 (in thousands)
Balance, beginning of period$875,958 
Acquisition600,178 
Accretion(214,415)
Net decrease in expected cash flows(10,995)
Balance, end of period$1,250,726 
Summary of Allowance for Credit Losses The following table summarizes the allowance for credit losses for loans at December 31, 2020 and 2019:
20202019
 (in thousands)
Components of allowance for credit losses for loans:
Allowance for loan losses$340,243 $161,759 
Allowance for unfunded credit commitments11,111 2,845 
Total allowance for credit losses for loans$351,354 $164,604 
Summary of Provision for Credit Losses
The following table summarizes the provision for credit losses for loans for the years ended December 31, 2020, 2019 and 2018: 
202020192018
 (in thousands)
Components of provision for credit losses for loans:
Provision for loan losses$123,922 $25,809 $31,661 
Provision for unfunded credit commitments1,165 (1,591)840 
Total provision for credit losses for loans$125,087 $24,218 $32,501 
Summary of Activity in Allowance for Loan Losses
The following table details the activity in the allowance for loan losses by portfolio segment for the years ended December 31, 2020 and 2019: 
Commercial
and Industrial		Commercial
Real Estate		Residential
Mortgage		ConsumerTotal
 (in thousands)
December 31, 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 
Beginning balance, adjusted119,228 95,470 25,635 13,957 254,290 
Loans charged-off(34,630)(767)(598)(9,294)(45,289)
Charged-off loans recovered 1,956 1,506 670 3,188 7,320 
Net (charge-offs) recoveries(32,674)739 72 (6,106)(37,969)
Provision for loan losses44,516 67,904 3,166 8,336 123,922 
Ending balance$131,070 $164,113 $28,873 $16,187 $340,243 
December 31, 2019
Allowance for loan losses:
Beginning balance$90,956 $49,650 $5,041 $6,212 $151,859 
Loans charged-off (13,260)(158)(126)(8,671)(22,215)
Charged-off loans recovered 2,397 1,237 66 2,606 6,306 
Net (charge-offs) recoveries(10,863)1,079 (60)(6,065)(15,909)
Provision for loan losses23,966 (5,056)79 6,820 25,809 
Ending balance$104,059 $45,673 $5,060 $6,967 $161,759 
*    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 for the years ended December 31, 2020 and 2019.
Commercial
and Industrial		Commercial
Real Estate		Residential
Mortgage		ConsumerTotal
 (in thousands)
December 31, 2020
Allowance for loan losses:
Individually evaluated for credit losses$73,063 $1,338 $1,206 $264 $75,871 
Collectively evaluated for credit losses58,007 162,775 27,667 15,923 264,372 
Total$131,070 $164,113 $28,873 $16,187 $340,243 
Loans:
Individually evaluated for credit losses$131,057 $61,754 $35,151 $1,631 $229,593 
Collectively evaluated for credit losses6,730,651 18,409,069 4,148,592 2,699,207 31,987,519 
Total$6,861,708 $18,470,823 $4,183,743 $2,700,838 $32,217,112 
December 31, 2019
Allowance for loan losses:
Individually evaluated for credit losses$36,662 $1,338 $518 $58 $38,576 
Collectively evaluated for credit losses67,397 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 losses4,043,123 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 
Impaired Loans by Loan 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