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Loans and Allowances for Credit Losses (Tables) | 9 Months Ended
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Sep. 30, 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, 2019 |  | December 31, 2018
|  | Fixed Rate |  | Variable Rate |  | Non-accrual |  | Total |  | Fixed Rate |  | Variable Rate |  | Non-accrual |  | Total
Commercial |  | $ | 3,184,237 |  |  | $ | 11,128,682 |  |  | $ | 111,706 |  |  | $ | 14,424,625 |  |  | $ | 2,251,188 |  |  | $ | 11,285,049 |  |  | $ | 99,841 |  |  | $ | 13,636,078 |
Commercial real estate |  | 1,070,050 |  |  | 3,532,822 |  |  | 23,185 |  |  | 4,626,057 |  |  | 1,477,274 |  |  | 3,265,918 |  |  | 21,621 |  |  | 4,764,813 |
Residential mortgage |  | 1,690,286 |  |  | 389,713 |  |  | 37,304 |  |  | 2,117,303 |  |  | 1,830,224 |  |  | 358,254 |  |  | 41,555 |  |  | 2,230,033 |
Personal |  | 191,827 |  |  | 925,284 |  |  | 271 |  |  | 1,117,382 |  |  | 190,687 |  |  | 834,889 |  |  | 230 |  |  | 1,025,806 |
Total |  | $ | 6,136,400 |  |  | $ | 15,976,501 |  |  | $ | 172,466 |  |  | $ | 22,285,367 |  |  | $ | 5,749,373 |  |  | $ | 15,744,110 |  |  | $ | 163,247 |  |  | $ | 21,656,730 |
Accruing loans past due (90 days)1 |  |  |  |  |  |  |  |  |  |  | $ | 1,541 |  |  |  |  |  |  |  |  |  |  |  | $ | 1,338 |
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 September 30, 2019 is summarized as follows (in thousands):
|  | Commercial |  | Commercial Real Estate |  | Residential Mortgage |  | Personal |  | Nonspecific Allowance |  | Total
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 106,397 |  |  | $ | 54,188 |  |  | $ | 15,724 |  |  | $ | 9,388 |  |  | $ | 16,837 |  |  | $ | 202,534 |
Provision for loan losses |  | 9,861 |  |  | 102 |  |  | (253 | ) |  | 1,911 |  |  | 918 |  |  | 12,539 |
Loans charged off |  | (9,875 | ) |  | — |  |  | (56 | ) |  | (1,776 | ) |  | — |  |  | (11,707 | )
Recoveries |  | 260 |  |  | 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 balance |  | $ | 1,742 |  |  | $ | 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 |
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 nine months ended September 30, 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 |  | 34,740 |  |  | (10,075 | ) |  | (2,660 | ) |  | 3,434 |  |  | (13 | ) |  | 25,426 |
Loans charged off |  | (31,728 | ) |  | (118 | ) |  | (192 | ) |  | (4,671 | ) |  | — |  |  | (36,709 | )
Recoveries |  | 1,405 |  |  | 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 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 September 30, 2018 is summarized as follows (in thousands):
|  | Commercial |  | Commercial Real Estate |  | Residential Mortgage |  | Personal |  | Nonspecific Allowance |  | Total
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 113,722 |  |  | $ | 58,758 |  |  | $ | 18,544 |  |  | $ | 8,646 |  |  | $ | 15,472 |  |  | $ | 215,142 |
Provision for loan losses |  | (1,285 | ) |  | 1,391 |  |  | 1 |  |  | 883 |  |  | 3,418 |  |  | 4,408 |
Loans charged off |  | (9,602 | ) |  | — |  |  | (91 | ) |  | (1,380 | ) |  | — |  |  | (11,073 | )
Recoveries |  | 1,263 |  |  | 40 |  |  | 229 |  |  | 560 |  |  | — |  |  | 2,092 |
Ending balance |  | $ | 104,098 |  |  | $ | 60,189 |  |  | $ | 18,683 |  |  | $ | 8,709 |  |  | $ | 18,890 |  |  | $ | 210,569 |
Allowance for off-balance sheet credit losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 2,361 |  |  | 17 |  |  | 53 |  |  | 2 |  |  | — |  |  | $ | 2,433 |
Provision for off-balance sheet credit losses |  | (424 | ) |  | 19 |  |  | (3 | ) |  | — |  |  | — |  |  | (408 | )
Ending balance |  | $ | 1,937 |  |  | $ | 36 |  |  | $ | 50 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2,025 |
Total provision for credit losses |  | $ | (1,709 | ) |  | $ | 1,410 |  |  | $ | (2 | ) |  | $ | 883 |  |  | $ | 3,418 |  |  | $ | 4,000 |
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 nine months ended September 30, 2018 is summarized as follows (in thousands):
|  | Commercial |  | Commercial Real Estate |  | Residential Mortgage |  | Personal |  | Nonspecific Allowance |  | Total
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 124,269 |  |  | $ | 56,621 |  |  | $ | 18,451 |  |  | $ | 9,124 |  |  | $ | 22,217 |  |  | $ | 230,682 |
Provision for loan losses |  | 2,720 |  |  | 248 |  |  | (418 | ) |  | 1,486 |  |  | (3,327 | ) |  | 709 |
Loans charged off |  | (24,940 | ) |  | — |  |  | (326 | ) |  | (3,802 | ) |  | — |  |  | (29,068 | )
Recoveries |  | 2,049 |  |  | 3,320 |  |  | 976 |  |  | 1,901 |  |  | — |  |  | 8,246 |
Ending balance |  | $ | 104,098 |  |  | $ | 60,189 |  |  | $ | 18,683 |  |  | $ | 8,709 |  |  | $ | 18,890 |  |  | $ | 210,569 |
Allowance for off-balance sheet credit losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 3,644 |  |  | $ | 45 |  |  | $ | 43 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 3,734 |
Provision for off-balance sheet credit losses |  | (1,707 | ) |  | (9 | ) |  | 7 |  |  | — |  |  | — |  |  | (1,709 | )
Ending balance |  | $ | 1,937 |  |  | $ | 36 |  |  | $ | 50 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2,025 |
Total provision for credit losses |  | $ | 1,013 |  |  | $ | 239 |  |  | $ | (411 | ) |  | $ | 1,486 |  |  | $ | (3,327 | ) |  | $ | (1,000 | )
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at September 30, 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 |  | $ | 14,312,919 |  |  | $ | 99,110 |  |  | $ | 111,706 |  |  | $ | 7,533 |  |  | $ | 14,424,625 |  |  | $ | 106,643 |
Commercial real estate |  | 4,602,872 |  |  | 54,350 |  |  | 23,185 |  |  | — |  |  | 4,626,057 |  |  | 54,350 |
Residential mortgage |  | 2,079,999 |  |  | 15,534 |  |  | 37,304 |  |  | — |  |  | 2,117,303 |  |  | 15,534 |
Personal |  | 1,117,111 |  |  | 10,150 |  |  | 271 |  |  | — |  |  | 1,117,382 |  |  | 10,150 |
Total |  | 22,112,901 |  |  | 179,144 |  |  | 172,466 |  |  | 7,533 |  |  | 22,285,367 |  |  | 186,677 |
Nonspecific allowance |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 17,755 |
Total |  | $ | 22,112,901 |  |  | $ | 179,144 |  |  | $ | 172,466 |  |  | $ | 7,533 |  |  | $ | 22,285,367 |  |  | $ | 204,432 |
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2018 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 |  | $ | 13,536,237 |  |  | $ | 93,494 |  |  | $ | 99,841 |  |  | $ | 8,732 |  |  | $ | 13,636,078 |  |  | $ | 102,226 |
Commercial real estate |  | 4,743,192 |  |  | 60,026 |  |  | 21,621 |  |  | — |  |  | 4,764,813 |  |  | 60,026 |
Residential mortgage |  | 2,188,478 |  |  | 17,964 |  |  | 41,555 |  |  | — |  |  | 2,230,033 |  |  | 17,964 |
Personal |  | 1,025,576 |  |  | 9,473 |  |  | 230 |  |  | — |  |  | 1,025,806 |  |  | 9,473 |
Total |  | 21,493,483 |  |  | 180,957 |  |  | 163,247 |  |  | 8,732 |  |  | 21,656,730 |  |  | 189,689 |
Nonspecific allowance |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 17,768 |
Total |  | $ | 21,493,483 |  |  | $ | 180,957 |  |  | $ | 163,247 |  |  | $ | 8,732 |  |  | $ | 21,656,730 |  |  | $ | 207,457 |
Schedule of Credit Quality Indicators [Table Text Block] | The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at September 30, 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 |  | $ | 14,396,278 |  |  | $ | 105,714 |  |  | $ | 28,347 |  |  | $ | 929 |  |  | $ | 14,424,625 |  |  | $ | 106,643 |
Commercial real estate |  | 4,626,057 |  |  | 54,350 |  |  | — |  |  | — |  |  | 4,626,057 |  |  | 54,350 |
Residential mortgage |  | 283,297 |  |  | 3,375 |  |  | 1,834,006 |  |  | 12,159 |  |  | 2,117,303 |  |  | 15,534 |
Personal |  | 1,032,522 |  |  | 7,836 |  |  | 84,860 |  |  | 2,314 |  |  | 1,117,382 |  |  | 10,150 |
Total |  | 20,338,154 |  |  | 171,275 |  |  | 1,947,213 |  |  | 15,402 |  |  | 22,285,367 |  |  | 186,677 |
Nonspecific allowance |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 17,755 |
Total |  | $ | 20,338,154 |  |  | $ | 171,275 |  |  | $ | 1,947,213 |  |  | $ | 15,402 |  |  | $ | 22,285,367 |  |  | $ | 204,432 |
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, 2018 is as follows (in thousands):
|  | Internally Risk Graded |  | Non-Graded |  | Total
|  | Recorded Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance |  | Recorded Investment |  | Related Allowance
Commercial |  | $ | 13,586,654 |  |  | $ | 101,303 |  |  | $ | 49,424 |  |  | $ | 923 |  |  | $ | 13,636,078 |  |  | $ | 102,226 |
Commercial real estate |  | 4,764,813 |  |  | 60,026 |  |  | — |  |  | — |  |  | 4,764,813 |  |  | 60,026 |
Residential mortgage |  | 505,046 |  |  | 3,310 |  |  | 1,724,987 |  |  | 14,654 |  |  | 2,230,033 |  |  | 17,964 |
Personal |  | 948,890 |  |  | 6,633 |  |  | 76,916 |  |  | 2,840 |  |  | 1,025,806 |  |  | 9,473 |
Total |  | 19,805,403 |  |  | 171,272 |  |  | 1,851,327 |  |  | 18,417 |  |  | 21,656,730 |  |  | 189,689 |
Nonspecific allowance |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 17,768 |
Total |  | $ | 19,805,403 |  |  | $ | 171,272 |  |  | $ | 1,851,327 |  |  | $ | 18,417 |  |  | $ | 21,656,730 |  |  | $ | 207,457 |
Loans are considered to be performing if they are in compliance with the original terms of the agreement and currently exhibit no factors that cause management to have doubts about the borrowers' ability to remain in compliance with the original terms of the agreement, which is consistent with the regulatory guideline of “pass.” Performing loans also include past due residential mortgages that are guaranteed by agencies of the U.S. government that continue to accrue interest based on criteria of the guarantors' programs. Other loans especially mentioned are currently performing in compliance with the original terms of the agreement but may have a potential weakness that deserves management’s close attention, consistent with regulatory guidelines. The risk grading process identified certain loans that have a well-defined weakness (e.g. inadequate debt service coverage or liquidity or marginal capitalization; repayment may depend on collateral or other risk mitigation) that may jeopardize liquidation of the debt and represent a greater risk due to deterioration in the financial condition of the borrower. This is consistent with the regulatory guideline for “substandard.” Because the borrowers are still performing in accordance with the original terms of the loan agreements, these loans were not placed in nonaccruing status. Nonaccruing loans represent loans for which full collection of principal and interest is uncertain. This is substantially the same criteria used to determine whether a loan is impaired and includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines. The following table summarizes the Company’s loan portfolio at September 30, 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 |  | $ | 3,927,285 |  |  | $ | 60,405 |  |  | $ | 37,685 |  |  | $ | 88,894 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,114,269 |
Services |  | 3,185,367 |  |  | 38,118 |  |  | 36,645 |  |  | 6,119 |  |  | — |  |  | — |  |  | 3,266,249 |
Wholesale/retail |  | 1,829,614 |  |  | 9,757 |  |  | 7,742 |  |  | 1,504 |  |  | — |  |  | — |  |  | 1,848,617 |
Manufacturing |  | 652,804 |  |  | 24,229 |  |  | 12,634 |  |  | 8,741 |  |  | — |  |  | — |  |  | 698,408 |
Healthcare |  | 2,984,306 |  |  | 25,205 |  |  | 17,479 |  |  | 5,978 |  |  | — |  |  | — |  |  | 3,032,968 |
Public finance |  | 744,840 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 744,840 |
Other commercial and industrial |  | 671,819 |  |  | 2,053 |  |  | 16,632 |  |  | 423 |  |  | 28,300 |  |  | 47 |  |  | 719,274 |
Total commercial |  | 13,996,035 |  |  | 159,767 |  |  | 128,817 |  |  | 111,659 |  |  | 28,300 |  |  | 47 |  |  | 14,424,625 |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential construction and land development |  | 135,011 |  |  | — |  |  | — |  |  | 350 |  |  | — |  |  | — |  |  | 135,361 |
Retail |  | 765,708 |  |  | 12,067 |  |  | 1,262 |  |  | 20,132 |  |  | — |  |  | — |  |  | 799,169 |
Office |  | 1,007,136 |  |  | 5,203 |  |  | 1,081 |  |  | 855 |  |  | — |  |  | — |  |  | 1,014,275 |
Multifamily |  | 1,316,856 |  |  | 1,196 |  |  | 6,501 |  |  | 286 |  |  | — |  |  | — |  |  | 1,324,839 |
Industrial |  | 872,627 |  |  | — |  |  | — |  |  | 909 |  |  | — |  |  | — |  |  | 873,536 |
Other commercial real estate |  | 474,465 |  |  | 784 |  |  | 2,975 |  |  | 653 |  |  | — |  |  | — |  |  | 478,877 |
Total commercial real estate |  | 4,571,803 |  |  | 19,250 |  |  | 11,819 |  |  | 23,185 |  |  | — |  |  | — |  |  | 4,626,057 |
Residential mortgage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 280,243 |  |  | 326 |  |  | 2,191 |  |  | 537 |  |  | 763,535 |  |  | 19,628 |  |  | 1,066,460 |
Permanent mortgages guaranteed by U.S. government agencies |  | — |  |  | — |  |  | — |  |  | — |  |  | 185,432 |  |  | 6,332 |  |  | 191,764 |
Home equity |  | — |  |  | — |  |  | — |  |  | — |  |  | 848,272 |  |  | 10,807 |  |  | 859,079 |
Total residential mortgage |  | 280,243 |  |  | 326 |  |  | 2,191 |  |  | 537 |  |  | 1,797,239 |  |  | 36,767 |  |  | 2,117,303 |
Personal |  | 1,032,381 |  |  | 46 |  |  | 33 |  |  | 63 |  |  | 84,651 |  |  | 208 |  |  | 1,117,382 |
Total |  | $ | 19,880,462 |  |  | $ | 179,389 |  |  | $ | 142,860 |  |  | $ | 135,444 |  |  | $ | 1,910,190 |  |  | $ | 37,022 |  |  | $ | 22,285,367 |
The following table summarizes the Company’s loan portfolio at December 31, 2018 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 |  | $ | 3,414,039 |  |  | $ | 42,176 |  |  | $ | 86,624 |  |  | $ | 47,494 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,590,333 |
Services |  | 3,167,203 |  |  | 49,761 |  |  | 32,661 |  |  | 8,567 |  |  | — |  |  | — |  |  | 3,258,192 |
Wholesale/retail |  | 1,593,902 |  |  | 18,809 |  |  | 7,131 |  |  | 1,316 |  |  | — |  |  | — |  |  | 1,621,158 |
Manufacturing |  | 668,438 |  |  | 30,934 |  |  | 22,230 |  |  | 8,919 |  |  | — |  |  | — |  |  | 730,521 |
Healthcare |  | 2,730,121 |  |  | 14,920 |  |  | 37,698 |  |  | 16,538 |  |  | — |  |  | — |  |  | 2,799,277 |
Public finance |  | 804,550 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 804,550 |
Other commercial and industrial |  | 756,815 |  |  | 1,266 |  |  | 7,588 |  |  | 16,954 |  |  | 49,371 |  |  | 53 |  |  | 832,047 |
Total commercial |  | 13,135,068 |  |  | 157,866 |  |  | 193,932 |  |  | 99,788 |  |  | 49,371 |  |  | 53 |  |  | 13,636,078 |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential construction and land development |  | 148,234 |  |  | — |  |  | — |  |  | 350 |  |  | — |  |  | — |  |  | 148,584 |
Retail |  | 885,588 |  |  | 11,926 |  |  | 1,289 |  |  | 20,279 |  |  | — |  |  | — |  |  | 919,082 |
Office |  | 1,059,334 |  |  | 10,532 |  |  | 3,054 |  |  | — |  |  | — |  |  | — |  |  | 1,072,920 |
Multifamily |  | 1,287,471 |  |  | 281 |  |  | 12 |  |  | 301 |  |  | — |  |  | — |  |  | 1,288,065 |
Industrial |  | 776,898 |  |  | — |  |  | 1,208 |  |  | — |  |  | — |  |  | — |  |  | 778,106 |
Other commercial real estate |  | 555,301 |  |  | 1,188 |  |  | 876 |  |  | 691 |  |  | — |  |  | — |  |  | 558,056 |
Total commercial real estate |  | 4,712,826 |  |  | 23,927 |  |  | 6,439 |  |  | 21,621 |  |  | — |  |  | — |  |  | 4,764,813 |
Residential mortgage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 269,678 |  |  | 52 |  |  | 9,730 |  |  | 1,991 |  |  | 819,199 |  |  | 21,960 |  |  | 1,122,610 |
Permanent mortgages guaranteed by U.S. government agencies |  | — |  |  | — |  |  | — |  |  | — |  |  | 183,734 |  |  | 7,132 |  |  | 190,866 |
Home equity |  | 223,298 |  |  | — |  |  | 296 |  |  | — |  |  | 682,491 |  |  | 10,472 |  |  | 916,557 |
Total residential mortgage |  | 492,976 |  |  | 52 |  |  | 10,026 |  |  | 1,991 |  |  | 1,685,424 |  |  | 39,564 |  |  | 2,230,033 |
Personal |  | 944,256 |  |  | 115 |  |  | 4,443 |  |  | 76 |  |  | 76,762 |  |  | 154 |  |  | 1,025,806 |
Total |  | $ | 19,285,126 |  |  | $ | 181,960 |  |  | $ | 214,840 |  |  | $ | 123,476 |  |  | $ | 1,811,557 |  |  | $ | 39,771 |  |  | $ | 21,656,730 |
Summary of Impaired Loans [Table Text Block] | Impaired Loans Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreement. This generally includes all nonaccruing loans, all loans modified in a TDR and all loans repurchased from GNMA pools. A summary of impaired loans at September 30, 2019 follows (in thousands):
| As of |  | For the |  | For the
| September 30, 2019 |  | Three Months Ended |  | Nine Months Ended
|  |  | Recorded Investment |  |  |  | September 30, 2019 |  | September 30, 2019
| Unpaid Principal Balance |  | Total |  | With No Allowance |  | With Allowance |  | Related Allowance |  | Average Recorded Investment |  | Interest Income Recognized |  | Average Recorded Investment |  | Interest Income Recognized
Commercial: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy | $ | 139,897 |  |  | $ | 88,894 |  |  | $ | 62,981 |  |  | $ | 25,913 |  |  | $ | 7,176 |  |  | $ | 80,263 |  |  | $ | — |  |  | $ | 67,705 |  |  | $ | — |
Services | 9,390 |  |  | 6,119 |  |  | 6,093 |  |  | 26 |  |  | 26 |  |  | 8,103 |  |  | — |  |  | 5,172 |  |  | — |
Wholesale/retail | 1,718 |  |  | 1,504 |  |  | 1,243 |  |  | 261 |  |  | 101 |  |  | 1,447 |  |  | — |  |  | 1,087 |  |  | — |
Manufacturing 1 | 9,153 |  |  | 8,741 |  |  | 8,511 |  |  | 230 |  |  | 230 |  |  | 8,677 |  |  | — |  |  | 8,448 |  |  | — |
Healthcare | 17,786 |  |  | 5,978 |  |  | 5,978 |  |  | — |  |  | — |  |  | 11,063 |  |  | — |  |  | 8,547 |  |  | — |
Public finance | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other commercial and industrial | 8,261 |  |  | 470 |  |  | 470 |  |  | — |  |  | — |  |  | 7,998 |  |  | — |  |  | 8,585 |  |  | — |
Total commercial | 186,205 |  |  | 111,706 |  |  | 85,276 |  |  | 26,430 |  |  | 7,533 |  |  | 117,551 |  |  | — |  |  | 99,544 |  |  | — |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential construction and land development | 1,306 |  |  | 350 |  |  | 350 |  |  | — |  |  | — |  |  | 350 |  |  | — |  |  | 350 |  |  | — |
Retail | 20,516 |  |  | 20,132 |  |  | 20,132 |  |  | — |  |  | — |  |  | 20,094 |  |  | — |  |  | 20,206 |  |  | — |
Office | 855 |  |  | 855 |  |  | 855 |  |  | — |  |  | — |  |  | 855 |  |  | — |  |  | 427 |  |  | — |
Multifamily | 286 |  |  | 286 |  |  | 286 |  |  | — |  |  | — |  |  | 281 |  |  | — |  |  | 294 |  |  | — |
Industrial | 909 |  |  | 909 |  |  | 909 |  |  | — |  |  | — |  |  | 454 |  |  | — |  |  | 454 |  |  | — |
Other commercial real estate | 813 |  |  | 653 |  |  | 653 |  |  | — |  |  | — |  |  | 393 |  |  | — |  |  | 672 |  |  | — |
Total commercial real estate | 24,685 |  |  | 23,185 |  |  | 23,185 |  |  | — |  |  | — |  |  | 22,427 |  |  | — |  |  | 22,403 |  |  | — |
Residential mortgage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage | 24,639 |  |  | 20,165 |  |  | 20,165 |  |  | — |  |  | — |  |  | 20,984 |  |  | 280 |  |  | 22,058 |  |  | 894 |
Permanent mortgage guaranteed by U.S. government agencies 2 | 197,847 |  |  | 191,764 |  |  | 191,764 |  |  | — |  |  | — |  |  | 196,310 |  |  | 2,020 |  |  | 194,751 |  |  | 5,863 |
Home equity | 12,621 |  |  | 10,807 |  |  | 10,807 |  |  | — |  |  | — |  |  | 10,369 |  |  | — |  |  | 10,639 |  |  | — |
Total residential mortgage | 235,107 |  |  | 222,736 |  |  | 222,736 |  |  | — |  |  | — |  |  | 227,663 |  |  | 2,300 |  |  | 227,448 |  |  | 6,757 |
Personal | 338 |  |  | 271 |  |  | 271 |  |  | — |  |  | — |  |  | 254 |  |  | — |  |  | 251 |  |  | — |
Total | $ | 446,335 |  |  | $ | 357,898 |  |  | $ | 331,468 |  |  | $ | 26,430 |  |  | $ | 7,533 |  |  | $ | 367,895 |  |  | $ | 2,300 |  |  | $ | 349,646 |  |  | $ | 6,757 |
1 | Impaired manufacturing sector loans included $4.7 million of loans from an affiliated entity, with no allowance as the fair value of the collateral exceeded the outstanding principal balance at September 30, 2019.
2 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 September 30, 2019, the majority were accruing based on the guarantee by U.S. government agencies. Generally, no interest income is recognized on impaired loans until all principal balances, including amounts charged-off, are recovered. A summary of impaired loans at December 31, 2018 follows (in thousands):
|  |  |  | Recorded Investment
|  | Unpaid Principal Balance |  | Total |  | With No Allowance |  | With Allowance |  | Related Allowance
Commercial: |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 79,675 |  |  | $ | 47,494 |  |  | $ | 18,639 |  |  | $ | 28,855 |  |  | $ | 5,362 |
Services |  | 13,437 |  |  | 8,567 |  |  | 8,489 |  |  | 78 |  |  | 74 |
Wholesale/retail |  | 1,722 |  |  | 1,316 |  |  | 1,015 |  |  | 301 |  |  | 101 |
Manufacturing |  | 10,055 |  |  | 8,919 |  |  | 8,673 |  |  | 246 |  |  | 246 |
Healthcare |  | 24,319 |  |  | 16,538 |  |  | 10,563 |  |  | 5,975 |  |  | 2,949 |
Public finance |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other commercial and industrial |  | 26,955 |  |  | 17,007 |  |  | 17,007 |  |  | — |  |  | — |
Total commercial |  | 156,163 |  |  | 99,841 |  |  | 64,386 |  |  | 35,455 |  |  | 8,732 |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential construction and land development |  | 1,306 |  |  | 350 |  |  | 350 |  |  | — |  |  | — |
Retail |  | 27,680 |  |  | 20,279 |  |  | 20,279 |  |  | — |  |  | — |
Office |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Multifamily |  | 301 |  |  | 301 |  |  | 301 |  |  | — |  |  | — |
Industrial |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other commercial real estate |  | 851 |  |  | 691 |  |  | 691 |  |  | — |  |  | — |
Total commercial real estate |  | 30,138 |  |  | 21,621 |  |  | 21,621 |  |  | — |  |  | — |
Residential mortgage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 28,716 |  |  | 23,951 |  |  | 23,951 |  |  | — |  |  | — |
Permanent mortgage guaranteed by U.S. government agencies 1 |  | 196,296 |  |  | 190,866 |  |  | 190,866 |  |  | — |  |  | — |
Home equity |  | 12,196 |  |  | 10,472 |  |  | 10,472 |  |  | — |  |  | — |
Total residential mortgage |  | 237,208 |  |  | 225,289 |  |  | 225,289 |  |  | — |  |  | — |
Personal |  | 278 |  |  | 230 |  |  | 230 |  |  | — |  |  | — |
Total |  | $ | 423,787 |  |  | $ | 346,981 |  |  | $ | 311,526 |  |  | $ | 35,455 |  |  | $ | 8,732 |
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, 2018, 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, loans past due and accruing and nonaccrual loans as of September 30, 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 |  | $ | 4,025,375 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 88,894 |  |  | $ | 4,114,269 |
Services |  | 3,249,994 |  |  | 7,305 |  |  | 2,096 |  |  | 735 |  |  | 6,119 |  |  | 3,266,249 |
Wholesale/retail |  | 1,844,203 |  |  | 2,910 |  |  | — |  |  | — |  |  | 1,504 |  |  | 1,848,617 |
Manufacturing |  | 687,358 |  |  | 2,309 |  |  | — |  |  | — |  |  | 8,741 |  |  | 698,408 |
Healthcare |  | 3,026,838 |  |  | 94 |  |  | 2 |  |  | 56 |  |  | 5,978 |  |  | 3,032,968 |
Public finance |  | 744,840 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 744,840 |
Other commercial and industrial |  | 718,419 |  |  | 337 |  |  | 48 |  |  | — |  |  | 470 |  |  | 719,274 |
Total commercial |  | 14,297,027 |  |  | 12,955 |  |  | 2,146 |  |  | 791 |  |  | 111,706 |  |  | 14,424,625 |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential construction and land development |  | 134,947 |  |  | — |  |  | — |  |  | 64 |  |  | 350 |  |  | 135,361 |
Retail |  | 779,037 |  |  | — |  |  | — |  |  | — |  |  | 20,132 |  |  | 799,169 |
Office |  | 1,013,420 |  |  | — |  |  | — |  |  | — |  |  | 855 |  |  | 1,014,275 |
Multifamily |  | 1,318,148 |  |  | 6,405 |  |  | — |  |  | — |  |  | 286 |  |  | 1,324,839 |
Industrial |  | 872,627 |  |  | — |  |  | — |  |  | — |  |  | 909 |  |  | 873,536 |
Other commercial real estate |  | 477,126 |  |  | 335 |  |  | 106 |  |  | 657 |  |  | 653 |  |  | 478,877 |
Total commercial real estate |  | 4,595,305 |  |  | 6,740 |  |  | 106 |  |  | 721 |  |  | 23,185 |  |  | 4,626,057 |
Residential mortgage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 1,036,793 |  |  | 6,097 |  |  | 3,405 |  |  | — |  |  | 20,165 |  |  | 1,066,460 |
Permanent mortgages guaranteed by U.S. government agencies |  | 47,207 |  |  | 23,412 |  |  | 21,676 |  |  | 93,137 |  |  | 6,332 |  |  | 191,764 |
Home equity |  | 845,616 |  |  | 2,282 |  |  | 374 |  |  | — |  |  | 10,807 |  |  | 859,079 |
Total residential mortgage |  | 1,929,616 |  |  | 31,791 |  |  | 25,455 |  |  | 93,137 |  |  | 37,304 |  |  | 2,117,303 |
Personal |  | 1,116,888 |  |  | 100 |  |  | 94 |  |  | 29 |  |  | 271 |  |  | 1,117,382 |
Total |  | $ | 21,938,836 |  |  | $ | 51,586 |  |  | $ | 27,801 |  |  | $ | 94,678 |  |  | $ | 172,466 |  |  | $ | 22,285,367 |
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2018 is as follows (in thousands):
|  |  |  | Past Due |  |  |  |
|  | Current |  | 30 to 59 Days |  | 60 to 89 Days |  | 90 Days or More |  | Nonaccrual |  | Total
Commercial: |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 3,542,839 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 47,494 |  |  | $ | 3,590,333 |
Services |  | 3,237,578 |  |  | 6,009 |  |  | 6,038 |  |  | — |  |  | 8,567 |  |  | 3,258,192 |
Wholesale/retail |  | 1,619,290 |  |  | 515 |  |  | 37 |  |  | — |  |  | 1,316 |  |  | 1,621,158 |
Manufacturing |  | 721,204 |  |  | 392 |  |  | 6 |  |  | — |  |  | 8,919 |  |  | 730,521 |
Healthcare |  | 2,781,944 |  |  | 241 |  |  | — |  |  | 554 |  |  | 16,538 |  |  | 2,799,277 |
Public finance |  | 804,550 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 804,550 |
Other commercial and industrial |  | 814,489 |  |  | 518 |  |  | 25 |  |  | 8 |  |  | 17,007 |  |  | 832,047 |
Total commercial |  | 13,521,894 |  |  | 7,675 |  |  | 6,106 |  |  | 562 |  |  | 99,841 |  |  | 13,636,078 |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential construction and land development |  | 147,705 |  |  | 249 |  |  | 280 |  |  | — |  |  | 350 |  |  | 148,584 |
Retail |  | 884,424 |  |  | 14,379 |  |  | — |  |  | — |  |  | 20,279 |  |  | 919,082 |
Office |  | 1,072,920 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,072,920 |
Multifamily |  | 1,287,483 |  |  | 281 |  |  | — |  |  | — |  |  | 301 |  |  | 1,288,065 |
Industrial |  | 776,898 |  |  | 1,208 |  |  | — |  |  | — |  |  | — |  |  | 778,106 |
Other commercial real estate |  | 556,239 |  |  | 412 |  |  | — |  |  | 714 |  |  | 691 |  |  | 558,056 |
Total commercial real estate |  | 4,725,669 |  |  | 16,529 |  |  | 280 |  |  | 714 |  |  | 21,621 |  |  | 4,764,813 |
Residential mortgage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 1,095,097 |  |  | 3,196 |  |  | 366 |  |  | — |  |  | 23,951 |  |  | 1,122,610 |
Permanent mortgages guaranteed by U.S. government agencies |  | 37,459 |  |  | 24,369 |  |  | 16,345 |  |  | 105,561 |  |  | 7,132 |  |  | 190,866 |
Home equity |  | 904,572 |  |  | 1,102 |  |  | 352 |  |  | 59 |  |  | 10,472 |  |  | 916,557 |
Total residential mortgage |  | 2,037,128 |  |  | 28,667 |  |  | 17,063 |  |  | 105,620 |  |  | 41,555 |  |  | 2,230,033 |
Personal |  | 1,024,298 |  |  | 479 |  |  | 796 |  |  | 3 |  |  | 230 |  |  | 1,025,806 |
Total |  | $ | 21,308,989 |  |  | $ | 53,350 |  |  | $ | 24,245 |  |  | $ | 106,899 |  |  | $ | 163,247 |  |  | $ | 21,656,730 |

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