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Loans and Allowances for Credit Losses (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Loans and Leases Receivable, Net Amount [Abstract]    
Schedule of Loans by Portfolio Segment [Table Text Block]
Portfolio segments of the loan portfolio are as follows (in thousands):
 September 30, 2020
Fixed
Rate		Variable
Rate		Non-accrualTotal
Commercial1,424,416 11,971,337 169,953 $13,565,706 
Commercial real estate
1,012,882 3,667,866 12,952 4,693,700 
Paycheck protection program2,097,325 — — 2,097,325 
Loans to individuals2,132,653 1,275,668 38,248 3,446,569 
Total$6,667,276 $16,914,871 $221,153 $23,803,300 
Portfolio segments of the loan portfolio are as follows (in thousands):
 December 31, 2019
Fixed
Rate		Variable
Rate		Non-accrualTotal
Commercial$3,231,485 $10,684,749 $115,416 $14,031,650 
Commercial real estate
1,056,321 3,349,836 27,626 4,433,783 
Residential mortgage1,652,653 393,897 37,622 2,084,172 
Personal193,903 1,007,192 287 1,201,382 
Total$6,134,362 $15,435,674 $180,951 $21,750,987 
Accruing loans past due (90 days)1
   $7,680 
1Excludes residential mortgage loans guaranteed by agencies of the U.S. government
Rollforward of Allowance For Loan Losses And Accrual for Off-Balance Sheet Credit Losses [Table Text Block]
The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit is summarized as follows (in thousands):
Three Months Ended
September 30, 2020
 CommercialCommercial Real EstatePaycheck Protection ProgramLoans to IndividualsNonspecific AllowanceTotal
Allowance for loan losses:     
Beginning balance$310,422 $68,756 $— $56,419 $— $435,597 
Provision for loan losses2,108 3,118 — 1,383 — 6,609 
Loans charged off(25,319)(413)— (929)— (26,661)
Recoveries of loans previously charged off
3,066 114 — 1,052 — 4,232 
Ending Balance$290,277 $71,575 $— $57,925 — $419,777 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$14,582 $16,419 $— $1,918 $— $32,919 
Provision for off-balance sheet credit risk
(2,618)(2,426)— 94 — (4,950)
Ending Balance$11,964 $13,993 $— $2,012 $— $27,969 
Nine Months Ended
September 30, 2020
 CommercialCommercial Real EstatePaycheck Protection ProgramLoans to IndividualsNonspecific AllowanceTotal
Allowance for loan losses:      
Beginning balance$118,187 $51,805 $— $23,572 $17,195 $210,759 
Transition adjustment33,681 (4,620)— 13,943 (17,195)25,809 
Beginning balance, adjusted151,868 47,185 — 37,515 — 236,568 
Provision for loan losses190,984 25,454 — 20,500 — 236,938 
Loans charged off(56,421)(1,300)— (3,427)— (61,148)
Recoveries3,846 236 — 3,337 — 7,419 
Ending balance$290,277 $71,575 $— $57,925 $— $419,777 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$1,434 $107 $— $44 $— $1,585 
Transition adjustment10,144 11,660 — 1,748 — 23,552 
Beginning balance, adjusted11,578 11,767 — 1,792 — 25,137 
Provision for off-balance sheet credit losses
386 2,226 — 220 — 2,832 
Ending balance$11,964 $13,993 $— $2,012 $— $27,969 

Changes in our reasonable and supportable forecasts of macroeconomic variables, primarily due to the anticipated impact of the on-going COVID-19 pandemic, and other assumptions, resulted in a $12.8 million reduction in the allowance for lending activities during the third quarter of 2020. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $14.5 million increase in the allowance for lending activities.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at September 30, 2020 is as follows (in thousands):
 Collectively Measured
for General Allowances		Individually Measured
for Specific Allowances		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$13,395,753 $271,122 $169,953 $19,155 $13,565,706 $290,277 
Commercial real estate4,680,748 71,035 12,952 540 4,693,700 71,575 
Paycheck protection program2,097,325 — — — 2,097,325 — 
Loans to individuals3,408,321 57,925 38,248 — 3,446,569 57,925 
Total23,582,147 400,082 221,153 19,695 23,803,300 419,777 
The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit is summarized as follows (in thousands):
Three Months Ended
September 30, 2019
 CommercialCommercial Real EstateResidential MortgagePersonalNonspecific AllowanceTotal
Allowance for loan losses:      
Beginning balance$106,397 $54,188 $15,724 $9,388 $16,837 $202,534 
Provision for loan losses9,861 102 (253)1,911 918 12,539 
Loans charged off(9,875)— (56)(1,776)— (11,707)
Recoveries260 60 119 627 — 1,066 
Ending balance$106,643 $54,350 $15,534 $10,150 $17,755 $204,432 
Allowance for off-balance sheet credit losses:      
Beginning balance1,742 116 44 1 — $1,903 
Provision for off-balance sheet credit losses
(536)(3)— — — (539)
Ending balance$1,206 $113 $44 $1 $— $1,364 
Total provision for credit losses$9,325 $99 $(253)$1,911 $918 $12,000 

Nine Months Ended
September 30, 2019
 CommercialCommercial Real EstateResidential MortgagePersonalNonspecific AllowanceTotal
Allowance for loan losses:      
Beginning balance$102,226 $60,026 $17,964 $9,473 $17,768 $207,457 
Provision for loan losses34,740 (10,075)(2,660)3,434 (13)25,426 
Loans charged off(31,728)(118)(192)(4,671)— (36,709)
Recoveries1,405 4,517 422 1,914 — 8,258 
Ending balance$106,643 $54,350 $15,534 $10,150 $17,755 $204,432 
Allowance for off-balance sheet credit losses:      
Beginning balance$1,655 $52 $52 $31 $— $1,790 
Provision for off-balance sheet credit losses
(449)61 (8)(30)— (426)
Ending balance$1,206 $113 $44 $1 $— $1,364 
Total provision for credit losses$34,291 $(10,014)$(2,668)$3,404 $(13)$25,000 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2019 is as follows (in thousands):
 Collectively Measured
for Impairment		Individually Measured
for Impairment		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$13,916,234 $100,773 $115,416 $17,414 $14,031,650 $118,187 
Commercial real estate4,406,157 51,805 27,626 — 4,433,783 51,805 
Residential mortgage2,046,550 14,400 37,622 — 2,084,172 14,400 
Personal1,201,095 9,172 287 — 1,201,382 9,172 
Total21,570,036 176,150 180,951 17,414 21,750,987 193,564 
Nonspecific allowance— — — — — 17,195 
Total$21,570,036 $176,150 $180,951 $17,414 $21,750,987 $210,759 
Schedule of Credit Quality Indicators [Table Text Block]
The following table summarizes the Company’s loan portfolio at September 30, 2020 by the risk grade categories and vintage (in thousands): 
Origination Year
20202019201820172016PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Energy
Pass$57,239 $58,923 $93,066 $7,959 $1,131 $6,716 $2,474,328 $— $2,699,362 
Special Mention— — — — — — 465,643 — 465,643 
Accruing Substandard
295 — 951 — 14,406 — 409,628 — 425,280 
Nonaccrual1,652 6,541 15,496 — — 28,349 74,778 — 126,816 
Total energy
59,186 65,464 109,513 7,959 15,537 35,065 3,424,377 — 3,717,101 
Healthcare
Pass356,834 619,693 625,047 429,314 241,452 749,439 236,118 — 3,257,897 
Special Mention— 27,500 — 3,019 — 13,393 3,255 — 47,167 
Accruing Substandard
— 2,843 1,705 947 143 11,443 — — 17,081 
Nonaccrual— 18 183 — — 2,935 509 — 3,645 
Total healthcare356,834 650,054 626,935 433,280 241,595 777,210 239,882 — 3,325,790 
Services
Pass356,443 445,488 406,761 345,936 380,205 758,036 689,917 651 3,383,437 
Special Mention344 11,778 1,734 597 8,415 5,410 10,043 — 38,321 
Accruing Substandard
94 8,067 27,957 9,662 2,568 15,185 34,717 — 98,250 
Nonaccrual— 3,420 — 13,898 1,147 6,726 626 — 25,817 
Total services356,881 468,753 436,452 370,093 392,335 785,357 735,303 651 3,545,825 
General business
Pass327,729 446,214 342,469 242,267 126,259 229,142 1,145,429 2,766 2,862,275 
Special Mention— 4,335 13,235 7,126 3,876 3,457 4,782 21 36,832 
Accruing Substandard
1,005 15,955 11,316 11,007 7,501 8,526 8,894 4 64,208 
Nonaccrual1,675 3,853 4,865 1,647 787 118 659 71 13,675 
Total general business
330,409 470,357 371,885 262,047 138,423 241,243 1,159,764 2,862 2,976,990 
Total commercial
1,103,310 1,654,628 1,544,785 1,073,379 787,890 1,838,875 5,559,326 3,513 13,565,706 
Commercial real estate:
Pass578,864 1,184,368 1,021,832 517,976 347,920 780,900 207,440 — 4,639,300 
Special Mention— — 261 12,326 2,571 8,903 — — 24,061 
Accruing Substandard
— 8,349 — 4,187 — 4,824 27 — 17,387 
Nonaccrual— — — 232 6,575 6,145 — — 12,952 
Total commercial real estate
578,864 1,192,717 1,022,093 534,721 357,066 800,772 207,467 — 4,693,700 
Origination Year
20202019201820172016PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Paycheck protection program:
Pass2,097,325 — — — — — — — 2,097,325 
Total paycheck protection program2,097,325 — — — — — — — 2,097,325 
Loans to individuals:
Residential mortgage
Pass414,273 166,795 138,524 157,514 178,830 390,803 341,673 26,129 1,814,541 
Special Mention— 47 1,879 20 — 309 527 12 2,794 
Accruing Substandard
— — — — — 39 159 12 210 
Nonaccrual— 43 1,509 735 2,057 24,431 2,066 758 31,599 
Total residential mortgage
414,273 166,885 141,912 158,269 180,887 415,582 344,425 26,911 1,849,144 
Residential mortgage guaranteed by U.S. government agencies
Pass2,385 29,819 29,745 43,690 57,322 214,889 — — 377,850 
Nonaccrual— — 404 — — 5,993 — — 6,397 
Total residential mortgage guaranteed by U.S. government agencies
2,385 29,819 30,149 43,690 57,322 220,882 — — 384,247 
Personal:
Pass182,066 204,478 79,041 104,217 70,812 98,598 471,503 1,498 1,212,213 
Special Mention42 24 11 53 46 45 1 — 222 
Accruing Substandard
— 211 — 265 — — 15 — 491 
Nonaccrual— 17 49 53 59 44 30 — 252 
Total personal
182,108 204,730 79,101 104,588 70,917 98,687 471,549 1,498 1,213,178 
Total loans to individuals
598,766 401,434 251,162 306,547 309,126 735,151 815,974 28,409 3,446,569 
Total loans
$4,378,265 $3,248,779 $2,818,040 $1,914,647 $1,454,082 $3,374,798 $6,582,767 $31,922 $23,803,300 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2019 is as follows (in thousands):
 Internally Risk GradedNon-GradedTotal
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$13,997,538 $117,236 $34,112 $951 $14,031,650 $118,187 
Commercial real estate4,433,783 51,805 — — 4,433,783 51,805 
Residential mortgage279,113 3,085 1,805,059 11,315 2,084,172 14,400 
Personal1,116,297 7,003 85,085 2,169 1,201,382 9,172 
Total19,826,731 179,129 1,924,256 14,435 21,750,987 193,564 
Nonspecific allowance— — — — — 17,195 
Total$19,826,731 $179,129 $1,924,256 $14,435 $21,750,987 $210,759 
The following table summarizes the Company’s loan portfolio at December 31, 2019 by the risk grade categories (in thousands): 
 Internally Risk GradedNon-Graded 
Performing
 PassOther Loans Especially MentionedAccruing SubstandardNonaccrualPerformingNonaccrualTotal
Commercial:      
Energy$3,700,406 $117,298 $63,951 $91,722 $— $— $3,973,377 
Services3,050,946 29,943 33,791 7,483 — — 3,122,163 
Wholesale/retail1,749,023 5,281 5,399 1,163 — — 1,760,866 
Manufacturing623,219 18,214 13,883 10,133 — — 665,449 
Healthcare2,995,514 13,117 20,805 4,480 — — 3,033,916 
Public finance
709,868 — — — — — 709,868 
Other commercial and industrial
709,729 4,028 17,744 398 34,075 37 766,011 
Total commercial13,538,705 187,881 155,573 115,379 34,075 37 14,031,650 
Commercial real estate:      
Residential construction and land development
150,529 — — 350 — — 150,879 
Retail743,343 12,067 1,243 18,868 — — 775,521 
Office923,202 5,177 — — — — 928,379 
Multifamily1,257,005 1,604 95 6,858 — — 1,265,562 
Industrial852,539 1,658 1,011 909 — — 856,117 
Other commercial real estate
455,045 1,639 — 641 — — 457,325 
Total commercial real estate
4,381,663 22,145 2,349 27,626 — — 4,433,783 
Residential mortgage:      
Permanent mortgage276,138 78 2,404 493 758,260 19,948 1,057,321 
Permanent mortgage guaranteed by U.S. government agencies
— — — — 191,694 6,100 197,794 
Home equity— — — — 817,976 11,081 829,057 
Total residential mortgage
276,138 78 2,404 493 1,767,930 37,129 2,084,172 
Personal1,116,196 45 — 56 84,853 232 1,201,382 
Total$19,312,702 $210,149 $160,326 $143,554 $1,886,858 $37,398 $21,750,987 
Summary of Impaired Loans [Table Text Block]  
A summary of impaired loans at December 31, 2019 follows (in thousands): 
  Recorded Investment
 Unpaid
Principal
Balance		TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:     
Energy$149,441 $91,722 $44,244 $47,478 $16,854 
Services10,923 7,483 6,301 1,182 240 
Wholesale/retail1,980 1,163 902 261 101 
Manufacturing10,848 10,133 9,914 219 219 
Healthcare13,774 4,480 4,480 — — 
Public finance— — — — — 
Other commercial and industrial8,227 435 435 — — 
Total commercial195,193 115,416 66,276 49,140 17,414 
Commercial real estate:     
Residential construction and land development1,306 350 350 — — 
Retail20,265 18,868 18,868 — — 
Office— — — — — 
Multifamily6,858 6,858 6,858 — — 
Industrial909 909 909 — — 
Other commercial real estate801 641 641 — — 
Total commercial real estate30,139 27,626 27,626 — — 
Residential mortgage:     
Permanent mortgage24,868 20,441 20,441 — — 
Permanent mortgage guaranteed by U.S. government agencies1
204,187 197,794 197,794 — — 
Home equity12,967 11,081 11,081 — — 
Total residential mortgage242,022 229,316 229,316 — — 
Personal360 287 287 — — 
Total$467,714 $372,645 $323,505 $49,140 $17,414 
1    All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2019, the majority were accruing based on the guarantee by U.S. government agencies.
Summary of Loans by Aging Status [Table Text Block]
A summary of loans currently performing and past due as of September 30, 2020 is as follows (in thousands):
  Past Due Past Due 90 Days or More and Accruing
 Current30 to 59
Days		60 to 89 Days90 Days
or More		Total
Commercial:    
Energy$3,603,548 $27,064 $— $86,489 $3,717,101 $— 
Healthcare3,316,556 5,419 — 3,815 3,325,790 171 
Services3,521,644 6,503 5,168 12,510 3,545,825 58 
General business2,955,752 14,002 342 6,894 2,976,990 443 
Total commercial13,397,500 52,988 5,510 109,708 13,565,706 672 
Commercial real estate4,673,416 2,029 532 17,723 4,693,700 4,771 
Paycheck protection program2,097,325 — — — 2,097,325 — 
Loans to individuals:    
Residential mortgage1,830,005 8,299 1,128 9,712 1,849,144 2,241 
Residential mortgage guaranteed by U.S. government agencies
172,678 56,264 34,355 120,950 384,247 117,188 
Personal1,212,488 99 520 71 1,213,178 — 
Total loans to individuals3,215,171 64,662 36,003 130,733 3,446,569 119,429 
Total$23,383,412 $119,679 $42,045 $258,164 $23,803,300 $124,872 
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2019 is as follows (in thousands):
  Past Due 
 Current30 to 59
Days		60 to 89 Days90 Days
or More		NonaccrualTotal
Commercial:    
Energy$3,881,244 $401 $10 $— 91,722 $3,973,377 
Services3,105,621 1,737 523 6,799 7,483 3,122,163 
Wholesale1,758,878 712 113 — 1,163 1,760,866 
Manufacturing654,329 410 190 387 10,133 665,449 
Healthcare3,027,329 2,039 — 68 4,480 3,033,916 
Public finance707,638 2,230 — — — 709,868 
Other commercial and industrial764,390 414 772 — 435 766,011 
Total commercial13,899,429 7,943 1,608 7,254 115,416 14,031,650 
Commercial real estate:
Residential construction and land development
147,379 3,093 — 57 350 150,879 
Retail756,653 — — — 18,868 775,521 
Office928,379 — — — — 928,379 
Multifamily1,258,704 — — — 6,858 1,265,562 
Industrial855,208 — — — 909 856,117 
Other commercial real estate454,253 1,827 250 354 641 457,325 
Total commercial real estate4,400,576 4,920 250 411 27,626 4,433,783 
Residential Mortgage:
Permanent mortgage1,034,716 2,011 153 — 20,441 1,057,321 
Permanent mortgage guaranteed by U.S. government agencies
46,898 24,203 18,187 102,406 6,100 197,794 
Home equity814,325 3,343 308 — 11,081 829,057 
Total residential mortgage1,895,939 29,557 18,648 102,406 37,622 2,084,172 
Personal1,196,362 4,664 54 15 287 1,201,382 
Total$21,392,306 $47,084 $20,560 $110,086 $180,951 $21,750,987 
Financing Receivable, Nonaccrual [Table Text Block]
A summary of nonaccruing loans at September 30, 2020 follows (in thousands): 
As of September 30, 2020
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Energy$126,816 $86,793 $40,023 $16,504 
Healthcare3,645 3,645 — — 
Services25,817 20,456 5,361 2,574 
General business13,675 13,177 498 77 
Total commercial169,953 124,071 45,882 19,155 
Commercial real estate12,952 7,584 5,368 540 
Loans to individuals:    
Residential mortgage31,599 31,599 — — 
Residential mortgage guaranteed by U.S. government agencies
6,397 6,397 — — 
Personal252 252 — — 
Total loans to individuals38,248 38,248 — — 
Total$221,153 $169,903 $51,250 $19,695