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Loans and Allowances for Credit Losses (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | 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):
|  | March 31, 2020
|  | Fixed Rate |  | Variable Rate |  | Non-accrual |  | Total
Commercial |  | 3,205,558 |  |  | 11,471,793 |  |  | 118,624 |  |  | $ | 14,795,975 |
Commercial real estate |  | 1,045,825 |  |  | 3,395,715 |  |  | 8,545 |  |  | 4,450,085 |
Loans to individuals |  | 1,878,018 |  |  | 1,303,889 |  |  | 36,003 |  |  | 3,217,910 |
Total |  | $ | 6,129,401 |  |  | $ | 16,171,397 |  |  | $ | 163,172 |  |  | $ | 22,463,970 |
|  | Portfolio segments of the loan portfolio are as follows (in thousands):
|  | December 31, 2019
|  | Fixed Rate |  | Variable Rate |  | Non-accrual |  | Total
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 mortgage |  | 1,652,653 |  |  | 393,897 |  |  | 37,622 |  |  | 2,084,172 |
Personal |  | 193,903 |  |  | 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 |
1 | Excludes 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 for the three months ended March 31, 2020 is summarized as follows (in thousands):
|  | Commercial |  | Commercial Real Estate |  | Loans to Individuals |  | Nonspecific Allowance |  | Total
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 118,187 |  |  | $ | 51,805 |  |  | $ | 23,572 |  |  | $ | 17,195 |  |  | $ | 210,759 |
Transition adjustment |  | 33,681 |  |  | (4,620 | ) |  | 13,943 |  |  | (17,195 | ) |  | 25,809 |
Beginning balance, adjusted |  | 151,868 |  |  | 47,185 |  |  | 37,515 |  |  | — |  |  | 236,568 |
Provision for loan losses |  | 77,723 |  |  | 5,115 |  |  | 13,126 |  |  | — |  |  | 95,964 |
Loans charged off |  | (16,615 | ) |  | (886 | ) |  | (1,416 | ) |  | — |  |  | (18,917 | )
Recoveries of loans previously charged off |  | 462 |  |  | 47 |  |  | 1,187 |  |  | — |  |  | 1,696 |
Ending Balance |  | 213,438 |  |  | 51,461 |  |  | 50,412 |  |  | — |  |  | 315,311 |
Allowance for off-balance sheet credit risk from unfunded loan commitments: |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 1,434 |  |  | 107 |  |  | 44 |  |  | — |  |  | 1,585 |
Transition adjustment |  | 10,144 |  |  | 11,660 |  |  | 1,748 |  |  | — |  |  | 23,552 |
Beginning balance, adjusted |  | 11,578 |  |  | 11,767 |  |  | 1,792 |  |  | — |  |  | 25,137 |
Provision for off-balance sheet credit risk |  | 2,462 |  |  | 808 |  |  | 107 |  |  | — |  |  | 3,377 |
Ending Balance |  | 14,040 |  |  | 12,575 |  |  | 1,899 |  |  | — |  |  | 28,514 |
Changes in our reasonable and supportable forecasts of macroeconomic variables, primarily due to the impact of the COVID-19 pandemic, oil price declines, and other assumptions, required a provision of $66.2 million during the first quarter of 2020. All other changes totaled $33.1 million, which included $7.5 million related to loan growth, $8.4 million related to changes in impairment, risk grading and other portfolio changes and net charge-offs of $17.2 million. The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2020 is as follows (in thousands):
|  | Collectively Measured for General Allowances |  | Individually Measured for Specific Allowances |  | Total
|  | Recorded Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance
Commercial |  | $ | 14,677,351 |  |  | $ | 203,554 |  |  | $ | 118,624 |  |  | $ | 9,884 |  |  | $ | 14,795,975 |  |  | $ | 213,438 |
Commercial real estate |  | 4,441,540 |  |  | 51,461 |  |  | 8,545 |  |  | — |  |  | 4,450,085 |  |  | 51,461 |
Loans to individuals |  | 3,181,907 |  |  | 50,412 |  |  | 36,003 |  |  | — |  |  | 3,217,910 |  |  | 50,412 |
Total |  | 22,300,798 |  |  | 305,427 |  |  | 163,172 |  |  | 9,884 |  |  | 22,463,970 |  |  | 315,311 |
| 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 for the three months ended March 31, 2019 is summarized as follows (in thousands):
|  | Commercial |  | Commercial Real Estate |  | Residential Mortgage |  | Personal |  | Nonspecific Allowance |  | Total
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 102,226 |  |  | $ | 60,026 |  |  | $ | 17,964 |  |  | $ | 9,473 |  |  | $ | 17,768 |  |  | $ | 207,457 |
Provision for loan losses |  | 11,108 |  |  | (2,004 | ) |  | (2,408 | ) |  | (137 | ) |  | 1,410 |  |  | 7,969 |
Loans charged off |  | (10,468 | ) |  | — |  |  | (42 | ) |  | (1,265 | ) |  | — |  |  | (11,775 | )
Recoveries |  | 711 |  |  | 112 |  |  | 154 |  |  | 712 |  |  | — |  |  | 1,689 |
Ending balance |  | $ | 103,577 |  |  | $ | 58,134 |  |  | $ | 15,668 |  |  | $ | 8,783 |  |  | $ | 19,178 |  |  | $ | 205,340 |
Allowance for off-balance sheet credit losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 1,655 |  |  | 52 |  |  | 52 |  |  | 31 |  |  | — |  |  | $ | 1,790 |
Provision for off-balance sheet credit losses |  | 70 |  |  | (4 | ) |  | (5 | ) |  | (30 | ) |  | — |  |  | 31 |
Ending balance |  | $ | 1,725 |  |  | $ | 48 |  |  | $ | 47 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1,821 |
Total provision for credit losses |  | $ | 11,178 |  |  | $ | (2,008 | ) |  | $ | (2,413 | ) |  | $ | (167 | ) |  | $ | 1,410 |  |  | $ | 8,000 |
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 Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance
Commercial |  | $ | 13,916,234 |  |  | $ | 100,773 |  |  | $ | 115,416 |  |  | $ | 17,414 |  |  | $ | 14,031,650 |  |  | $ | 118,187 |
Commercial real estate |  | 4,406,157 |  |  | 51,805 |  |  | 27,626 |  |  | — |  |  | 4,433,783 |  |  | 51,805 |
Residential mortgage |  | 2,046,550 |  |  | 14,400 |  |  | 37,622 |  |  | — |  |  | 2,084,172 |  |  | 14,400 |
Personal |  | 1,201,095 |  |  | 9,172 |  |  | 287 |  |  | — |  |  | 1,201,382 |  |  | 9,172 |
Total |  | 21,570,036 |  |  | 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 March 31, 2020 by the risk grade categories and vintage (in thousands):
| Origination Year |  |  |
| 2020 | 2019 | 2018 | 2017 | 2016 | Prior | Revolving Loans | Revolving Loans Converted to Term Loans | Total
Commercial: |  |  |  |  |  |  |  |  |
Energy |  |  |  |  |  |  |  |  |
Pass | $ | 2,285 |  | $ | 107,434 |  | $ | 74,946 |  | $ | 15,377 |  | $ | 1,506 |  | $ | 3,484 |  | $ | 3,505,123 |  | $ | — |  | $ | 3,710,155 |
Special Mention | — |  | — |  | 10,260 |  | — |  | — |  | — |  | 118,222 |  | — |  | 128,482 |
Accruing Substandard | — |  | — |  | — |  | — |  | 58 |  | 13,439 |  | 163,094 |  | — |  | 176,591 |
Nonaccrual | — |  | 3,802 |  | — |  | — |  | — |  | 28,899 |  | 63,747 |  | — |  | 96,448 |
Total energy | 2,285 |  | 111,236 |  | 85,206 |  | 15,377 |  | 1,564 |  | 45,822 |  | 3,850,186 |  | — |  | 4,111,676 |
Healthcare |  |  |  |  |  |  |  |  |
Pass | 131,002 |  | 615,580 |  | 623,438 |  | 479,985 |  | 250,320 |  | 806,699 |  | 205,384 |  | 27 |  | 3,112,435 |
Special Mention | — |  | — |  | — |  | 3,782 |  | 178 |  | 19,133 |  | 3,515 |  | — |  | 26,608 |
Accruing Substandard | — |  | 3,505 |  | 7,955 |  | 1,001 |  | 57 |  | 9,465 |  | — |  | — |  | 21,983 |
Nonaccrual | 29 |  | 37 |  | 535 |  | — |  | — |  | 2,935 |  | 534 |  | — |  | 4,070 |
Total healthcare | 131,031 |  | 619,122 |  | 631,928 |  | 484,768 |  | 250,555 |  | 838,232 |  | 209,433 |  | 27 |  | 3,165,096 |
Services |  |  |  |  |  |  |  |  |
Pass | 65,471 |  | 529,831 |  | 512,549 |  | 441,302 |  | 407,067 |  | 899,776 |  | 987,628 |  | 2,594 |  | 3,846,218 |
Special Mention | — |  | 1,125 |  | 18,071 |  | 13,977 |  | 4,219 |  | 10,963 |  | 10,715 |  | — |  | 59,070 |
Accruing Substandard | — |  | 10,675 |  | 1,782 |  | 2,774 |  | 8,674 |  | 3,709 |  | 14,421 |  | — |  | 42,035 |
Nonaccrual | — |  | — |  | — |  | 2,633 |  | 1,167 |  | 3,931 |  | 694 |  | — |  | 8,425 |
Total services | 65,471 |  | 541,631 |  | 532,402 |  | 460,686 |  | 421,127 |  | 918,379 |  | 1,013,458 |  | 2,594 |  | 3,955,748 |
General business |  |  |  |  |  |  |  |  |
Pass | 154,807 |  | 525,223 |  | 365,108 |  | 271,723 |  | 165,711 |  | 278,923 |  | 1,705,114 |  | 15,600 |  | 3,482,209 |
Special Mention | — |  | 7,382 |  | 3,259 |  | 6,530 |  | 1,003 |  | 5,168 |  | 7,387 |  | 138 |  | 30,867 |
Accruing Substandard | 169 |  | 8,715 |  | 5,900 |  | 4,564 |  | 6,195 |  | 5,005 |  | 10,144 |  | 6 |  | 40,698 |
Nonaccrual | — |  | 1,980 |  | 4,928 |  | 1,100 |  | 1,344 |  | 161 |  | 154 |  | 14 |  | 9,681 |
Total general business | 154,976 |  | 543,300 |  | 379,195 |  | 283,917 |  | 174,253 |  | 289,257 |  | 1,722,799 |  | 15,758 |  | 3,563,455 |
Total commercial | 353,763 |  | 1,815,289 |  | 1,628,731 |  | 1,244,748 |  | 847,499 |  | 2,091,690 |  | 6,795,876 |  | 18,379 |  | 14,795,975 |
Commercial real estate: |  |  |  |  |  |  |  |  |
Pass | 187,958 |  | 1,085,148 |  | 1,049,257 |  | 599,480 |  | 382,196 |  | 880,706 |  | 231,526 |  | 42 |  | 4,416,313 |
Special Mention | — |  | — |  | — |  | 12,167 |  | 1,640 |  | 3,152 |  | — |  | — |  | 16,959 |
Accruing Substandard | — |  | 35 |  | 1,011 |  | 6,722 |  | — |  | 473 |  | 27 |  | — |  | 8,268 |
Nonaccrual | — |  | — |  | — |  | 232 |  | 7,484 |  | 829 |  | — |  | — |  | 8,545 |
Total commercial real estate | 187,958 |  | 1,085,183 |  | 1,050,268 |  | 618,601 |  | 391,320 |  | 885,160 |  | 231,553 |  | 42 |  | 4,450,085 |
| Origination Year |  |  |
| 2020 | 2019 | 2018 | 2017 | 2016 | Prior | Revolving Loans | Revolving Loans Converted to Term Loans | Total
Loans to individuals: |  |  |  |  |  |  |  |  |
Residential mortgage |  |  |  |  |  |  |  |  |
Pass | 58,635 |  | 216,234 |  | 195,224 |  | 231,620 |  | 220,120 |  | 496,676 |  | 36,298 |  | 352,870 |  | 1,807,677 |
Special Mention | — |  | — |  | 286 |  | 38 |  | 205 |  | 1,859 |  | 246 |  | 835 |  | 3,469 |
Accruing Substandard | — |  | — |  | — |  | 94 |  | 2,155 |  | 277 |  | 40 |  | 122 |  | 2,688 |
Nonaccrual | — |  | 31 |  | 491 |  | 322 |  | 1,039 |  | 26,039 |  | 658 |  | 2,141 |  | 30,721 |
Total residential mortgage | 58,635 |  | 216,265 |  | 196,001 |  | 232,074 |  | 223,519 |  | 524,851 |  | 37,242 |  | 355,968 |  | 1,844,555 |
Residential mortgage guaranteed by U.S. government agencies |  |  |  |  |  |  |  |  |
Pass | — |  | 1,459 |  | 8,321 |  | 13,353 |  | 28,986 |  | 140,765 |  | — |  | — |  | 192,884 |
Nonaccrual | — |  | — |  | — |  | — |  | — |  | 5,005 |  | — |  | — |  | 5,005 |
Total residential mortgage guaranteed by U.S. government agencies | — |  | 1,459 |  | 8,321 |  | 13,353 |  | 28,986 |  | 145,770 |  | — |  | — |  | 197,889 |
Personal: |  |  |  |  |  |  |  |  |
Pass | 48,145 |  | 234,882 |  | 88,016 |  | 115,576 |  | 74,987 |  | 103,717 |  | 505,951 |  | 3,000 |  | 1,174,274 |
Special Mention | — |  | 30 |  | 37 |  | 50 |  | 49 |  | 455 |  | 2 |  | — |  | 623 |
Accruing Substandard | — |  | 264 |  | 9 |  | — |  | — |  | — |  | 19 |  | — |  | 292 |
Nonaccrual | — |  | 57 |  | 53 |  | 24 |  | 62 |  | 50 |  | 31 |  | — |  | 277 |
Total personal | 48,145 |  | 235,233 |  | 88,115 |  | 115,650 |  | 75,098 |  | 104,222 |  | 506,003 |  | 3,000 |  | 1,175,466 |
Total loans to individuals | 106,780 |  | 452,957 |  | 292,437 |  | 361,077 |  | 327,603 |  | 774,843 |  | 543,245 |  | 358,968 |  | 3,217,910 |
Total loans | $ | 648,501 |  | $ | 3,353,429 |  | $ | 2,971,436 |  | $ | 2,224,426 |  | $ | 1,566,422 |  | $ | 3,751,693 |  | $ | 7,570,674 |  | $ | 377,389 |  | $ | 22,463,970 |
|  | 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 Graded |  | Non-Graded |  | Total
|  | Recorded Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance
Commercial |  | $ | 13,997,538 |  |  | $ | 117,236 |  |  | $ | 34,112 |  |  | $ | 951 |  |  | $ | 14,031,650 |  |  | $ | 118,187 |
Commercial real estate |  | 4,433,783 |  |  | 51,805 |  |  | — |  |  | — |  |  | 4,433,783 |  |  | 51,805 |
Residential mortgage |  | 279,113 |  |  | 3,085 |  |  | 1,805,059 |  |  | 11,315 |  |  | 2,084,172 |  |  | 14,400 |
Personal |  | 1,116,297 |  |  | 7,003 |  |  | 85,085 |  |  | 2,169 |  |  | 1,201,382 |  |  | 9,172 |
Total |  | 19,826,731 |  |  | 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 Graded |  | Non-Graded |  |
|  | Performing |  |  |  |  |  |  |  |
|  | Pass |  | Other Loans Especially Mentioned |  | Accruing Substandard |  | Nonaccrual |  | Performing |  | Nonaccrual |  | Total
Commercial: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 3,700,406 |  |  | $ | 117,298 |  |  | $ | 63,951 |  |  | $ | 91,722 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,973,377 |
Services |  | 3,050,946 |  |  | 29,943 |  |  | 33,791 |  |  | 7,483 |  |  | — |  |  | — |  |  | 3,122,163 |
Wholesale/retail |  | 1,749,023 |  |  | 5,281 |  |  | 5,399 |  |  | 1,163 |  |  | — |  |  | — |  |  | 1,760,866 |
Manufacturing |  | 623,219 |  |  | 18,214 |  |  | 13,883 |  |  | 10,133 |  |  | — |  |  | — |  |  | 665,449 |
Healthcare |  | 2,995,514 |  |  | 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 commercial |  | 13,538,705 |  |  | 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 |
Retail |  | 743,343 |  |  | 12,067 |  |  | 1,243 |  |  | 18,868 |  |  | — |  |  | — |  |  | 775,521 |
Office |  | 923,202 |  |  | 5,177 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 928,379 |
Multifamily |  | 1,257,005 |  |  | 1,604 |  |  | 95 |  |  | 6,858 |  |  | — |  |  | — |  |  | 1,265,562 |
Industrial |  | 852,539 |  |  | 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 mortgage |  | 276,138 |  |  | 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 |
Personal |  | 1,116,196 |  |  | 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 |  | Total |  | With No Allowance |  | With Allowance |  | Related Allowance
Commercial: |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 149,441 |  |  | $ | 91,722 |  |  | $ | 44,244 |  |  | $ | 47,478 |  |  | $ | 16,854 |
Services |  | 10,923 |  |  | 7,483 |  |  | 6,301 |  |  | 1,182 |  |  | 240 |
Wholesale/retail |  | 1,980 |  |  | 1,163 |  |  | 902 |  |  | 261 |  |  | 101 |
Manufacturing |  | 10,848 |  |  | 10,133 |  |  | 9,914 |  |  | 219 |  |  | 219 |
Healthcare |  | 13,774 |  |  | 4,480 |  |  | 4,480 |  |  | — |  |  | — |
Public finance |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other commercial and industrial |  | 8,227 |  |  | 435 |  |  | 435 |  |  | — |  |  | — |
Total commercial |  | 195,193 |  |  | 115,416 |  |  | 66,276 |  |  | 49,140 |  |  | 17,414 |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential construction and land development |  | 1,306 |  |  | 350 |  |  | 350 |  |  | — |  |  | — |
Retail |  | 20,265 |  |  | 18,868 |  |  | 18,868 |  |  | — |  |  | — |
Office |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Multifamily |  | 6,858 |  |  | 6,858 |  |  | 6,858 |  |  | — |  |  | — |
Industrial |  | 909 |  |  | 909 |  |  | 909 |  |  | — |  |  | — |
Other commercial real estate |  | 801 |  |  | 641 |  |  | 641 |  |  | — |  |  | — |
Total commercial real estate |  | 30,139 |  |  | 27,626 |  |  | 27,626 |  |  | — |  |  | — |
Residential mortgage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 24,868 |  |  | 20,441 |  |  | 20,441 |  |  | — |  |  | — |
Permanent mortgage guaranteed by U.S. government agencies1 |  | 204,187 |  |  | 197,794 |  |  | 197,794 |  |  | — |  |  | — |
Home equity |  | 12,967 |  |  | 11,081 |  |  | 11,081 |  |  | — |  |  | — |
Total residential mortgage |  | 242,022 |  |  | 229,316 |  |  | 229,316 |  |  | — |  |  | — |
Personal |  | 360 |  |  | 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 March 31, 2020 is as follows (in thousands):
|  |  |  | Past Due |  |  |  | Past Due 90 Days or More and Accruing
|  | Current |  | 30 to 59 Days |  | 60 to 89 Days |  | 90 Days or More |  | Total |
Commercial: |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 4,058,605 |  |  | $ | 267 |  |  | $ | — |  |  | $ | 52,804 |  |  | $ | 4,111,676 |  |  | $ | — |
Healthcare |  | 3,160,196 |  |  | 46 |  |  | 111 |  |  | 4,743 |  |  | 3,165,096 |  |  | 714 |
Services |  | 3,941,795 |  |  | 7,173 |  |  | 198 |  |  | 6,582 |  |  | 3,955,748 |  |  | 74 |
General business |  | 3,553,504 |  |  | 2,618 |  |  | 4,651 |  |  | 2,682 |  |  | 3,563,455 |  |  | — |
Total commercial |  | 14,714,100 |  |  | 10,104 |  |  | 4,960 |  |  | 66,811 |  |  | 14,795,975 |  |  | 788 |
Commercial real estate |  | 4,433,887 |  |  | 4,523 |  |  | 340 |  |  | 11,335 |  |  | 4,450,085 |  |  | 2,796 |
Loans to individuals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage |  | 1,828,421 |  |  | 8,759 |  |  | 1,717 |  |  | 5,658 |  |  | 1,844,555 |  |  | 119 |
Residential mortgage guaranteed by U.S. government agencies |  | 55,901 |  |  | 25,948 |  |  | 16,217 |  |  | 99,823 |  |  | 197,889 |  |  | 96,980 |
Personal |  | 1,175,143 |  |  | 169 |  |  | 77 |  |  | 77 |  |  | 1,175,466 |  |  | 3 |
Total loans to individuals |  | 3,059,465 |  |  | 34,876 |  |  | 18,011 |  |  | 105,558 |  |  | 3,217,910 |  |  | 97,102 |
Total |  | $ | 22,207,452 |  |  | $ | 49,503 |  |  | $ | 23,311 |  |  | $ | 183,704 |  |  | $ | 22,463,970 |  |  | $ | 100,686 |
|  | 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 |  |  |  |
|  | Current |  | 30 to 59 Days |  | 60 to 89 Days |  | 90 Days or More |  | Nonaccrual |  | Total
Commercial: |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 3,881,244 |  |  | $ | 401 |  |  | $ | 10 |  |  | $ | — |  |  | 91,722 |  |  | $ | 3,973,377 |
Services |  | 3,105,621 |  |  | 1,737 |  |  | 523 |  |  | 6,799 |  |  | 7,483 |  |  | 3,122,163 |
Wholesale |  | 1,758,878 |  |  | 712 |  |  | 113 |  |  | — |  |  | 1,163 |  |  | 1,760,866 |
Manufacturing |  | 654,329 |  |  | 410 |  |  | 190 |  |  | 387 |  |  | 10,133 |  |  | 665,449 |
Healthcare |  | 3,027,329 |  |  | 2,039 |  |  | — |  |  | 68 |  |  | 4,480 |  |  | 3,033,916 |
Public finance |  | 707,638 |  |  | 2,230 |  |  | — |  |  | — |  |  | — |  |  | 709,868 |
Other commercial and industrial |  | 764,390 |  |  | 414 |  |  | 772 |  |  | — |  |  | 435 |  |  | 766,011 |
Total commercial |  | 13,899,429 |  |  | 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 |
Retail |  | 756,653 |  |  | — |  |  | — |  |  | — |  |  | 18,868 |  |  | 775,521 |
Office |  | 928,379 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 928,379 |
Multifamily |  | 1,258,704 |  |  | — |  |  | — |  |  | — |  |  | 6,858 |  |  | 1,265,562 |
Industrial |  | 855,208 |  |  | — |  |  | — |  |  | — |  |  | 909 |  |  | 856,117 |
Other commercial real estate |  | 454,253 |  |  | 1,827 |  |  | 250 |  |  | 354 |  |  | 641 |  |  | 457,325 |
Total commercial real estate |  | 4,400,576 |  |  | 4,920 |  |  | 250 |  |  | 411 |  |  | 27,626 |  |  | 4,433,783 |
Residential Mortgage: |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 1,034,716 |  |  | 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 equity |  | 814,325 |  |  | 3,343 |  |  | 308 |  |  | — |  |  | 11,081 |  |  | 829,057 |
Total residential mortgage |  | 1,895,939 |  |  | 29,557 |  |  | 18,648 |  |  | 102,406 |  |  | 37,622 |  |  | 2,084,172 |
Personal |  | 1,196,362 |  |  | 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 March 31, 2020 follows (in thousands):
| As of March 31, 2020
| Total |  | With No Allowance |  | With Allowance |  | Related Allowance
Commercial: |  |  |  |  |  |  |
Energy | $ | 96,448 |  |  | $ | 40,424 |  |  | $ | 56,024 |  |  | $ | 9,375 |
Healthcare | 4,070 |  |  | 4,070 |  |  | — |  |  | — |
Services | 8,425 |  |  | 7,258 |  |  | 1,167 |  |  | 240 |
General business | 9,681 |  |  | 9,412 |  |  | 269 |  |  | 269 |
Total commercial | 118,624 |  |  | 61,164 |  |  | 57,460 |  |  | 9,884 |
Commercial real estate | 8,545 |  |  | 8,545 |  |  | — |  |  | — |
Loans to individuals: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage | 30,721 |  |  | 30,721 |  |  | — |  |  | — |
Residential mortgage guaranteed by U.S. government agencies | 5,005 |  |  | 5,005 |  |  | — |  |  | — |
Personal | 277 |  |  | 277 |  |  | — |  |  | — |
Total loans to individuals | 36,003 |  |  | 36,003 |  |  | — |  |  | — |
Total | $ | 163,172 |  |  | $ | 105,712 |  |  | $ | 57,460 |  |  | $ | 9,884 |

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