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Loans and Allowances for Credit Losses | 12 Months Ended
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Dec. 31, 2021
Loans and Leases Receivable, Net Amount [Abstract] |
Loans [Text Block] | The portfolio segments of the loan portfolio are as follows (in thousands):
|  | December 31, 2021 |  | December 31, 2020 |  |
|  | Fixed Rate |  | Variable Rate |  | Non-accrual |  | Total |  | Fixed Rate |  | Variable Rate |  | Non-accrual |  | Total |  |  |  |  |  |  |  |
Commercial |  | $ | 3,360,117 |  |  | $ | 9,072,244 |  |  | $ | 74,104 |  |  | $ | 12,506,465 |  |  | $ | 3,174,203 |  |  | $ | 9,736,173 |  |  | $ | 167,159 |  |  | $ | 13,077,535 |  |  |  |  |  |  |  |  |
Commercial real estate |  | 929,015 |  |  | 2,888,048 |  |  | 14,262 |  |  | 3,831,325 |  |  | 1,047,486 |  |  | 3,623,806 |  |  | 27,246 |  |  | 4,698,538 |  |  |  |  |  |  |  |  |
Paycheck protection program |  | 276,341 |  |  | — |  |  | — |  |  | 276,341 |  |  | 1,682,310 |  |  | — |  |  | — |  |  | 1,682,310 |  |  |  |  |  |  |  |  |
Loans to individuals |  | 2,037,792 |  |  | 1,508,064 |  |  | 45,693 |  |  | 3,591,549 |  |  | 2,174,874 |  |  | 1,333,975 |  |  | 40,288 |  |  | 3,549,137 |  |  |  |  |  |  |  |  |
Total |  | $ | 6,603,265 |  |  | $ | 13,468,356 |  |  | $ | 134,059 |  |  | $ | 20,205,680 |  |  | $ | 8,078,873 |  |  | $ | 14,693,954 |  |  | $ | 234,693 |  |  | $ | 23,007,520 |  |  |  |  |  |  |  |  |
Foregone interest on nonaccrual loans |  |  |  |  |  |  |  | $ | 14,102 |  |  |  |  |  |  |  |  | $ | 22,870 |  |  |  |  |  |  |  |  |
At December 31, 2021, loans to businesses and individuals with collateral primarily located in Texas totaled $6.8 billion or 34% of the total loan portfolio. Loans to businesses and individuals with collateral primarily located in Oklahoma totaled $3.2 billion or 16% of our total loan portfolio. Loans to businesses and individuals with collateral primarily located in Colorado totaled $2.5 billion or 12% of our total loan portfolio. Loans for which the collateral location is not relevant, such as unsecured loans and reserve-based energy loans, are distributed by the borrower’s primary operating location. These geographic concentrations subject the loan portfolio to the general economic conditions within these areas. At December 31, 2020, loans to businesses and individuals with collateral primarily located in Texas totaled $7.2 billion or 31% of the loan portfolio, loans to businesses and individuals with collateral primarily located in Oklahoma totaled $3.8 billion or 17% of the loan portfolio and loans to businesses and individuals with collateral primarily located in Colorado totaled $2.8 billion or 12% of the loan portfolio. Commercial Commercial loans represent loans for working capital, facilities acquisition or expansion, purchases of equipment and other needs of commercial customers primarily located within our geographical footprint. Commercial loans are underwritten individually and represent on-going relationships based on a thorough knowledge of the customer, the customer’s industry and market. While commercial loans are generally secured by the customer’s assets including real property, inventory, accounts receivable, operating equipment, interest in mineral rights and other property and may also include personal guarantees of the owners and related parties, the primary source of repayment of the loans is the on-going cash flow from operations of the customer’s business. Inherent lending risk is centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with commercial lending policies. At December 31, 2021, commercial loans with collateral primarily located in Texas totaled $4.4 billion or 35% of the commercial loan portfolio segment. Commercial loans with collateral primarily located in Oklahoma totaled $1.7 billion or 13% of the commercial loan portfolio segment. Commercial loans with collateral primarily located in Colorado totaled $1.6 billion or 13% of the commercial loan portfolio segment. The commercial loan portfolio segment is further divided into loan classes. The services loan class totaled $3.4 billion or 17% of total loans. Approximately $1.7 billion of loans in the services class consisted of loans with individual balances of less than $10 million. Businesses included in the services class include Native American tribal and state and local municipal government entities, Native American tribal casino operations, educational services, foundations and not-for-profit organizations and specialty trade contractors. The energy loan class totaled $3.0 billion or 15% of total loans, including $2.2 billion of outstanding loans to energy producers. Approximately 67% of the committed production loans are secured by properties primarily producing oil and 33% of the committed production loans are secured by properties primarily producing natural gas. The healthcare loan class totaled $3.4 billion or 17% of total loans. The healthcare loan class consists primarily of loans for the development and operation of senior housing and care facilities, including independent living, assisted living and skilled nursing. Healthcare also includes loans to hospitals and other medical service providers. At December 31, 2020, commercial loans with collateral primarily located in Texas totaled $4.3 billion or 33% of the commercial loan portfolio segment, commercial loans with collateral primarily located in Oklahoma totaled $1.8 billion or 14% of the commercial loan portfolio segment and commercial loans with collateral primarily located in Colorado totaled $1.7 billion or 13% of the commercial loan portfolio segment. The energy loan class totaled $3.5 billion or 15% of total loans, including $2.6 billion of outstanding loans to energy producers. At December 31, 2020, approximately 58% of committed production loans were secured by properties primarily producing oil and 42% were secured by properties producing natural gas. The services loan class totaled $3.5 billion or 15% of total loans. Approximately $1.5 billion of loans in the services category consisted of loans with individual balances of less than $10 million. The healthcare loan class totaled $3.3 billion or 14% of total loans. Commercial Real Estate Commercial real estate loans are for the construction of buildings or other improvements to real estate and property held by borrowers for investment purposes primarily within our geographical footprint. We require collateral values in excess of the loan amounts, demonstrated cash flows in excess of expected debt service requirements, equity investment in the project and a portion of the project already sold, leased or permanent financing already secured. The expected cash flows from all significant new or renewed income producing property commitments are stress tested to reflect the risks in varying interest rates, vacancy rates and rental rates. As with commercial loans, inherent lending risks are centrally monitored on a continuous basis from underwriting throughout the life of the loan for compliance with applicable lending policies. At December 31, 2021, 30% of commercial real estate loans were secured by properties primarily located in the Dallas and Houston metropolitan areas of Texas and 12% of commercial real estate loans were secured by properties located primarily in the Tulsa and Oklahoma City metropolitan areas of Oklahoma. At December 31, 2020, 27% of commercial real estate loans are secured by properties primarily located in the Dallas and Houston metropolitan areas of Texas and 10% of commercial real estate loans were secured by properties located primarily in the Tulsa and Oklahoma City metropolitan areas of Oklahoma. Paycheck Protection Program BOK Financial is actively participating in programs initiated by the Coronavirus Aid, Relief and Economic Security Act ("CARES Act"), including the Small Business Administration's ("SBA") Paycheck Protection Program ("PPP") that began on April 3, 2020. PPP provided fully forgivable loans when utilized for qualified expenditures, including to help small business maintain payrolls during the COVID-19 pandemic. These loans generally have a contractual term of two years, though most are expected to be forgiven prior to maturity after completion of a compliance period. Loans are guaranteed and amounts forgiven will be reimbursed to the Company by the SBA. The loans carry a rate of 1%. Interest plus loan fees, which vary depending on loan size, are accrued over the contractual life of the loan. Any unaccreted origination fees will be recognized when the loan is paid. Loans to Individuals Loans to individuals include residential mortgage and personal loans. Residential mortgage loans provide funds for our customers to purchase or refinance their primary residence or to borrow against the equity in their home. These loans are secured by a first or second mortgage on the customer's primary residence. These loans are made in accordance with underwriting policies we believe to be conservative and are fully documented. Loans may be individually underwritten or credit scored based on size and other criteria. Credit scoring is assessed based on significant credit characteristics including credit history, residential and employment stability. In general, we sell the majority of our conforming fixed rate loan originations in the secondary market and retain the majority of our non-conforming and adjustable-rate mortgage loans. Our mortgage loan portfolio does not include payment option adjustable rate mortgage loans or adjustable rate mortgage loans with initial rates that are below market. Home equity loans are primarily first-lien and fully amortizing. Residential mortgage, which includes home equity loans, and personal loans are made in accordance with underwriting policies we believe to be conservative and are fully documented. Loans may be individually underwritten or credit scored based on size and other criteria. Credit scoring is assessed based on significant credit characteristics including credit history, residential and employment stability. Personal loans consist primarily of loans to Wealth Management clients secured by the cash surrender value of insurance policies and marketable securities. It also includes direct loans secured by and for the purchase of automobiles, recreational and marine equipment as well as unsecured loans. Approximately 91% of the loans in this segment are secured by collateral located within our geographical footprint. Loans for which the collateral location is less relevant, such as unsecured loans are categorized by the borrower’s primary operating location. Residential mortgage loans guaranteed by U.S. government agencies have limited credit exposure because of the agency guarantee. This amount includes residential mortgage loans previously sold into GNMA mortgage pools that the Company may repurchase when certain defined delinquency criteria are met. Because of this repurchase right, the Company is deemed to have regained effective control over these loans and must include them on the Consolidated Balance Sheet. Credit Commitments Commitments to extend credit are agreements to lend to a customer as long as there is no violation of conditions established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. At December 31, 2021, outstanding commitments totaled $12.5 billion. Because some commitments are expected to expire before being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. BOK Financial uses the same credit policies in making commitments as it does loans. The amount of collateral obtained, if deemed necessary, is based upon management’s credit evaluation of the borrower. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Because the credit risk involved in issuing standby letters of credit is essentially the same as that involved in extending loan commitments, BOK Financial uses the same credit policies in evaluating the creditworthiness of the customer. Additionally, BOK Financial uses the same evaluation process in obtaining collateral on standby letters of credit as it does for loan commitments. The term of these standby letters of credit is defined in each commitment and typically corresponds with the underlying loan commitment. At December 31, 2021, outstanding standby letters of credit totaled $700 million. Allowances for Credit Losses and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments BOK Financial maintains an allowance for loan losses and accrual for off-balance sheet credit risk from unfunded commitments. The allowance consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics based on probability of default, loss given default and exposure at default for each loan class developed based on current and forecasted relevant economic loss drivers. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees that are not unconditionally cancellable by the bank. 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 year ended December 31, 2021 is summarized as follows (in thousands):
|  | Commercial |  | Commercial Real Estate |  | Paycheck Protection Program |  | Loans to Individuals |  | Nonspecific Allowance |  | Total
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, adjusted |  | 254,934 |  |  | 86,558 |  |  | — |  |  | 47,148 |  |  | — |  |  | 388,640 |
Provision for loan losses |  | (59,326) |  |  | (26,522) |  |  | — |  |  | (9,354) |  |  | — |  |  | (95,202) |
Loans charged off |  | (43,956) |  |  | (2,485) |  |  | — |  |  | (4,910) |  |  | — |  |  | (51,351) |
Recoveries of loans previously charged off |  | 10,404 |  |  | 1,002 |  |  | — |  |  | 2,928 |  |  | — |  |  | 14,334 |
Ending balance |  | $ | 162,056 |  |  | $ | 58,553 |  |  | $ | — |  |  | $ | 35,812 |  |  | $ | — |  |  | $ | 256,421 |
Allowance for off-balance sheet credit risk from unfunded loan commitments: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, adjusted |  | 14,422 |  |  | 20,571 |  |  | — |  |  | 1,928 |  |  | — |  |  | 36,921 |
Provision for off-balance sheet credit risk |  | (610) |  |  | (3,129) |  |  | — |  |  | (205) |  |  | — |  |  | (3,944) |
Ending balance |  | $ | 13,812 |  |  | $ | 17,442 |  |  | $ | — |  |  | $ | 1,723 |  |  | $ | — |  |  | $ | 32,977 |
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 $90.1 million decrease in the allowance for lending activities during the year ended December 31, 2021. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $9.0 million decrease in the allowance for lending activities. 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 year ended December 31, 2020 is summarized as follows (in thousands):
|  | Commercial |  | Commercial Real Estate |  | Paycheck Protection Program |  | 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 |  | 171,800 |  |  | 40,407 |  |  | — |  |  | 10,253 |  |  | — |  |  | 222,460 |
Loans charged off |  | (73,370) |  |  | (1,300) |  |  | — |  |  | (4,729) |  |  | — |  |  | (79,399) |
Recoveries of loans previously charged off |  | 4,636 |  |  | 266 |  |  | — |  |  | 4,109 |  |  | — |  |  | 9,011 |
Ending balance |  | $ | 254,934 |  |  | $ | 86,558 |  |  | $ | — |  |  | $ | 47,148 |  |  | $ | — |  |  | $ | 388,640 |
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 |  | 2,844 |  |  | 8,804 |  |  | — |  |  | 136 |  |  | — |  |  | 11,784 |
Ending balance |  | $ | 14,422 |  |  | $ | 20,571 |  |  | $ | — |  |  | $ | 1,928 |  |  | $ | — |  |  | $ | 36,921 |
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2021 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 |  | $ | 12,432,361 |  |  | $ | 158,063 |  |  | $ | 74,104 |  |  | $ | 3,993 |  |  | $ | 12,506,465 |  |  | $ | 162,056 |
Commercial real estate |  | 3,817,063 |  |  | 56,204 |  |  | 14,262 |  |  | 2,349 |  |  | 3,831,325 |  |  | 58,553 |
Paycheck protection program |  | 276,341 |  |  | — |  |  | — |  |  | — |  |  | 276,341 |  |  | — |
Loans to individuals |  | 3,545,856 |  |  | 35,812 |  |  | 45,693 |  |  | — |  |  | 3,591,549 |  |  | 35,812 |
Total |  | $ | 20,071,621 |  |  | $ | 250,079 |  |  | $ | 134,059 |  |  | $ | 6,342 |  |  | $ | 20,205,680 |  |  | $ | 256,421 |
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 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 |  | $ | 12,910,376 |  |  | $ | 235,882 |  |  | $ | 167,159 |  |  | $ | 19,052 |  |  | $ | 13,077,535 |  |  | $ | 254,934 |
Commercial real estate |  | 4,671,292 |  |  | 83,169 |  |  | 27,246 |  |  | 3,389 |  |  | 4,698,538 |  |  | 86,558 |
Paycheck protection program |  | 1,682,310 |  |  | — |  |  | — |  |  | — |  |  | 1,682,310 |  |  | — |
Loans to individuals |  | 3,508,849 |  |  | 47,148 |  |  | 40,288 |  |  | — |  |  | 3,549,137 |  |  | 47,148 |
Total |  | $ | 22,772,827 |  |  | $ | 366,199 |  |  | $ | 234,693 |  |  | $ | 22,441 |  |  | $ | 23,007,520 |  |  | $ | 388,640 |
Credit Quality Indicators The Company utilizes risk grading as primary credit quality indicators as it influences the probability of default which is a key attribute in the expected credit losses calculation. Substantially all commercial as well as commercial real estate loans and certain loans to individuals are risk graded based on a quarterly evaluation of the borrowers’ ability to repay the loans. Certain commercial loans and most loans to individuals are small, homogeneous pools that are not risk-graded. The credit quality of these loans is based on past due days in accordance with regulatory guidelines. We have included in the credit quality indicator “pass” loans that 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.” This also includes 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 ("Special Mention") 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. Non-graded loans 30 to 59 days past due are categorized as Special Mention. The risk grading process identified certain loans that have a well-defined weakness (for example, 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 remain on accruing status. Non-graded loans 60 to 89 days past due are categorized as Accruing Substandard. Nonaccruing loans represent loans for which full collection of principal and interest is uncertain. This includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines. Non-graded loans 90 or more days past due are categorized as Nonaccrual. Probability of default is lowest for pass graded loans and increases for each credit quality indicator, Special Mention, and Accruing Substandard. Vintage represents the year of origination, except for revolving loans which are considered in aggregate. Loans that were once revolving but have converted to term loans without additional underwriting appear in a separate vintage column. The following table summarizes the Company's loan portfolio at December 31, 2021 by the risk grade categories and vintage (in thousands):
| Origination Year |  |  |
| 2021 | 2020 | 2019 | 2018 | 2017 | Prior | Revolving Loans | Revolving Loans Converted to Term Loans | Total
Commercial: |  |  |  |  |  |  |  |  |
Energy |  |  |  |  |  |  |  |  |
Pass | $ | 252,133 |  | $ | 29,556 |  | $ | 15,914 |  | $ | 13,548 |  | $ | 4,741 |  | $ | 6,765 |  | $ | 2,540,525 |  | $ | — |  | $ | 2,863,182 |
Special Mention | 558 |  | 771 |  | — |  | — |  | — |  | — |  | 750 |  | — |  | 2,079 |
Accruing Substandard | 10,650 |  | 22,611 |  | 1,185 |  | 814 |  | — |  | 716 |  | 74,556 |  | — |  | 110,532 |
Nonaccrual | — |  | 20,487 |  | — |  | — |  | — |  | 714 |  | 9,890 |  | — |  | 31,091 |
Total energy | 263,341 |  | 73,425 |  | 17,099 |  | 14,362 |  | 4,741 |  | 8,195 |  | 2,625,721 |  | — |  | 3,006,884 |
Healthcare |  |  |  |  |  |  |  |  |
Pass | 563,800 |  | 589,193 |  | 516,558 |  | 498,998 |  | 319,096 |  | 688,136 |  | 160,154 |  | 26 |  | 3,335,961 |
Special Mention | 6,835 |  | — |  | 15,583 |  | — |  | 11,135 |  | — |  | 5 |  | — |  | 33,558 |
Accruing Substandard | — |  | — |  | 27,135 |  | 543 |  | — |  | 1,981 |  | — |  | — |  | 29,659 |
Nonaccrual | — |  | — |  | — |  | 6,542 |  | — |  | 8,711 |  | 509 |  | — |  | 15,762 |
Total healthcare | 570,635 |  | 589,193 |  | 559,276 |  | 506,083 |  | 330,231 |  | 698,828 |  | 160,668 |  | 26 |  | 3,414,940 |
Services |  |  |  |  |  |  |  |  |
Pass | 696,149 |  | 405,057 |  | 289,375 |  | 275,010 |  | 225,404 |  | 795,029 |  | 607,958 |  | 375 |  | 3,294,357 |
Special Mention | 434 |  | 405 |  | 1,830 |  | 1,047 |  | 3,290 |  | 47 |  | 17,210 |  | 192 |  | 24,455 |
Accruing Substandard | 43 |  | 530 |  | 4,166 |  | 10,714 |  | 1,785 |  | 2,366 |  | 11,607 |  | — |  | 31,211 |
Nonaccrual | — |  | — |  | — |  | 230 |  | 13,918 |  | 2,519 |  | 503 |  | — |  | 17,170 |
Total services | 696,626 |  | 405,992 |  | 295,371 |  | 287,001 |  | 244,397 |  | 799,961 |  | 637,278 |  | 567 |  | 3,367,193 |
General business |  |  |  |  |  |  |  |  |
Pass | 584,438 |  | 211,892 |  | 264,462 |  | 177,384 |  | 168,977 |  | 215,014 |  | 1,047,420 |  | 2,284 |  | 2,671,871 |
Special Mention | 218 |  | 223 |  | 60 |  | 1,435 |  | 3,842 |  | — |  | 5,875 |  | — |  | 11,653 |
Accruing Substandard | 265 |  | 1,066 |  | 1,634 |  | 7,697 |  | 8,336 |  | 3,024 |  | 1,821 |  | — |  | 23,843 |
Nonaccrual | — |  | 2,444 |  | 4,562 |  | 1,046 |  | 762 |  | 518 |  | 730 |  | 19 |  | 10,081 |
Total general business | 584,921 |  | 215,625 |  | 270,718 |  | 187,562 |  | 181,917 |  | 218,556 |  | 1,055,846 |  | 2,303 |  | 2,717,448 |
Total commercial | 2,115,523 |  | 1,284,235 |  | 1,142,464 |  | 995,008 |  | 761,286 |  | 1,725,540 |  | 4,479,513 |  | 2,896 |  | 12,506,465 |
Commercial real estate: |  |  |  |  |  |  |  |  |
Pass | 717,400 |  | 711,231 |  | 871,283 |  | 403,115 |  | 279,058 |  | 664,684 |  | 117,847 |  | 31 |  | 3,764,649 |
Special Mention | — |  | — |  | — |  | 6,660 |  | 10,898 |  | 9,244 |  | — |  | — |  | 26,802 |
Accruing Substandard | — |  | — |  | — |  | 13,352 |  | 4,480 |  | 7,780 |  | — |  | — |  | 25,612 |
Nonaccrual | — |  | — |  | 8,076 |  | — |  | — |  | 6,186 |  | — |  | — |  | 14,262 |
Total commercial real estate | 717,400 |  | 711,231 |  | 879,359 |  | 423,127 |  | 294,436 |  | 687,894 |  | 117,847 |  | 31 |  | 3,831,325 |
| Origination Year |  |  |
| 2021 | 2020 | 2019 | 2018 | 2017 | Prior | Revolving Loans | Revolving Loans Converted to Term Loans | Total
Paycheck protection program: |  |  |  |  |  |  |  |  |
Pass | 237,357 |  | 38,984 |  | — |  | — |  | — |  | — |  | — |  | — |  | 276,341 |
Total paycheck protection program | 237,357 |  | 38,984 |  | — |  | — |  | — |  | — |  | — |  | — |  | 276,341 |
Loans to individuals: |  |  |  |  |  |  |  |  |
Residential mortgage |  |  |  |  |  |  |  |  |
Pass | 386,092 |  | 452,537 |  | 84,001 |  | 60,390 |  | 68,150 |  | 295,632 |  | 320,638 |  | 21,463 |  | 1,688,903 |
Special Mention | — |  | — |  | 156 |  | — |  | 19 |  | 411 |  | 282 |  | 159 |  | 1,027 |
Accruing Substandard | 98 |  | — |  | — |  | — |  | 127 |  | 41 |  | 400 |  | — |  | 666 |
Nonaccrual | 1,516 |  | 1,809 |  | 383 |  | 1,968 |  | 629 |  | 22,289 |  | 2,177 |  | 803 |  | 31,574 |
Total residential mortgage | 387,706 |  | 454,346 |  | 84,540 |  | 62,358 |  | 68,925 |  | 318,373 |  | 323,497 |  | 22,425 |  | 1,722,170 |
Residential mortgage guaranteed by U.S. government agencies |  |  |  |  |  |  |  |  |
Pass | 699 |  | 11,380 |  | 20,650 |  | 27,970 |  | 32,742 |  | 246,871 |  | — |  | — |  | 340,312 |
Nonaccrual | — |  | — |  | 1,259 |  | 821 |  | 635 |  | 11,146 |  | — |  | — |  | 13,861 |
Total residential mortgage guaranteed by U.S. government agencies | 699 |  | 11,380 |  | 21,909 |  | 28,791 |  | 33,377 |  | 258,017 |  | — |  | — |  | 354,173 |
Personal: |  |  |  |  |  |  |  |  |
Pass | 218,960 |  | 180,577 |  | 177,389 |  | 70,249 |  | 92,592 |  | 135,041 |  | 638,713 |  | 728 |  | 1,514,249 |
Special Mention | — |  | 9 |  | 34 |  | 3 |  | — |  | 47 |  | — |  | — |  | 93 |
Accruing Substandard | 435 |  | 5 |  | 165 |  | — |  | — |  | 1 |  | — |  | — |  | 606 |
Nonaccrual | 110 |  | 14 |  | 10 |  | 24 |  | 35 |  | 40 |  | 25 |  | — |  | 258 |
Total personal | 219,505 |  | 180,605 |  | 177,598 |  | 70,276 |  | 92,627 |  | 135,129 |  | 638,738 |  | 728 |  | 1,515,206 |
Total loans to individuals | 607,910 |  | 646,331 |  | 284,047 |  | 161,425 |  | 194,929 |  | 711,519 |  | 962,235 |  | 23,153 |  | 3,591,549 |
Total loans | $ | 3,678,190 |  | $ | 2,680,781 |  | $ | 2,305,870 |  | $ | 1,579,560 |  | $ | 1,250,651 |  | $ | 3,124,953 |  | $ | 5,559,595 |  | $ | 26,080 |  | $ | 20,205,680 |
The following table summarizes the Company's loan portfolio at December 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 | $ | 112,614 |  | $ | 51,863 |  | $ | 89,346 |  | $ | 7,178 |  | $ | 1,148 |  | $ | 7,956 |  | $ | 2,548,663 |  | $ | — |  | $ | 2,818,768 |
Special Mention | — |  | — |  | — |  | — |  | — |  | — |  | 202,590 |  | — |  | 202,590 |
Accruing Substandard | 24,000 |  | 1,363 |  | 1,453 |  | — |  | 12,667 |  | — |  | 283,294 |  | — |  | 322,777 |
Nonaccrual | 21,076 |  | 2,607 |  | — |  | — |  | — |  | 21,064 |  | 80,312 |  | — |  | 125,059 |
Total energy | 157,690 |  | 55,833 |  | 90,799 |  | 7,178 |  | 13,815 |  | 29,020 |  | 3,114,859 |  | — |  | 3,469,194 |
Healthcare |  |  |  |  |  |  |  |  |
Pass | 536,745 |  | 615,221 |  | 638,302 |  | 422,834 |  | 234,399 |  | 658,286 |  | 147,132 |  | — |  | 3,252,919 |
Special Mention | — |  | 27,500 |  | — |  | — |  | — |  | 8,282 |  | 5 |  | — |  | 35,787 |
Accruing Substandard | — |  | — |  | 1,191 |  | 929 |  | 132 |  | 11,387 |  | — |  | — |  | 13,639 |
Nonaccrual | — |  | 18 |  | 183 |  | — |  | — |  | 2,935 |  | 509 |  | — |  | 3,645 |
Total healthcare | 536,745 |  | 642,739 |  | 639,676 |  | 423,763 |  | 234,531 |  | 680,890 |  | 147,646 |  | — |  | 3,305,990 |
Services |  |  |  |  |  |  |  |  |
Pass | 534,853 |  | 436,384 |  | 372,867 |  | 307,374 |  | 373,785 |  | 683,936 |  | 665,491 |  | 682 |  | 3,375,372 |
Special Mention | 150 |  | 9,057 |  | 389 |  | 291 |  | 2,038 |  | 2,000 |  | 3,063 |  | — |  | 16,988 |
Accruing Substandard | 429 |  | 6,380 |  | 26,008 |  | 6,027 |  | 5,030 |  | 7,954 |  | 38,797 |  | — |  | 90,625 |
Nonaccrual | 4,833 |  | 448 |  | — |  | 12,590 |  | 1,049 |  | 6,138 |  | 540 |  | — |  | 25,598 |
Total services | 540,265 |  | 452,269 |  | 399,264 |  | 326,282 |  | 381,902 |  | 700,028 |  | 707,891 |  | 682 |  | 3,508,583 |
General business |  |  |  |  |  |  |  |  |
Pass | 419,756 |  | 394,985 |  | 310,273 |  | 236,222 |  | 103,987 |  | 186,600 |  | 1,055,878 |  | 2,316 |  | 2,710,017 |
Special Mention | 197 |  | 4,519 |  | 9,713 |  | 7,803 |  | 2,511 |  | 3,159 |  | 2,483 |  | 19 |  | 30,404 |
Accruing Substandard | 1,432 |  | 3,069 |  | 6,694 |  | 10,935 |  | 10,042 |  | 3,729 |  | 4,449 |  | 140 |  | 40,490 |
Nonaccrual | 1,675 |  | 3,728 |  | 4,863 |  | 1,436 |  | 530 |  | 107 |  | 477 |  | 41 |  | 12,857 |
Total general business | 423,060 |  | 406,301 |  | 331,543 |  | 256,396 |  | 117,070 |  | 193,595 |  | 1,063,287 |  | 2,516 |  | 2,793,768 |
Total commercial | 1,657,760 |  | 1,557,142 |  | 1,461,282 |  | 1,013,619 |  | 747,318 |  | 1,603,533 |  | 5,033,683 |  | 3,198 |  | 13,077,535 |
Commercial real estate: |  |  |  |  |  |  |  |  |
Pass | 725,577 |  | 1,211,338 |  | 954,226 |  | 489,193 |  | 314,899 |  | 722,475 |  | 223,131 |  | 38 |  | 4,640,877 |
Special Mention | — |  | — |  | 259 |  | 12,311 |  | 2,725 |  | 5,831 |  | — |  | — |  | 21,126 |
Accruing Substandard | — |  | — |  | — |  | 4,410 |  | — |  | 4,852 |  | 27 |  | — |  | 9,289 |
Nonaccrual | — |  | 8,300 |  | — |  | 232 |  | 7,468 |  | 11,246 |  | — |  | — |  | 27,246 |
Total commercial real estate | 725,577 |  | 1,219,638 |  | 954,485 |  | 506,146 |  | 325,092 |  | 744,404 |  | 223,158 |  | 38 |  | 4,698,538 |
| Origination Year |  |  |
| 2020 | 2019 | 2018 | 2017 | 2016 | Prior | Revolving Loans | Revolving Loans Converted to Term Loans | Total
Paycheck protection program: |  |  |  |  |  |  |  |  |
Pass | 1,682,310 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 1,682,310 |
Total paycheck protection program | 1,682,310 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 1,682,310 |
Loans to individuals: |  |  |  |  |  |  |  |  |
Residential mortgage |  |  |  |  |  |  |  |  |
Pass | 564,325 |  | 149,832 |  | 120,875 |  | 124,930 |  | 158,801 |  | 348,292 |  | 335,259 |  | 24,553 |  | 1,826,867 |
Special Mention | 33 |  | 11 |  | 2,094 |  | — |  | 59 |  | 318 |  | 950 |  | 10 |  | 3,475 |
Accruing Substandard | — |  | — |  | 51 |  | — |  | — |  | 34 |  | 272 |  | 76 |  | 433 |
Nonaccrual | 648 |  | 104 |  | 1,658 |  | 784 |  | 2,010 |  | 22,415 |  | 3,835 |  | 774 |  | 32,228 |
Total residential mortgage | 565,006 |  | 149,947 |  | 124,678 |  | 125,714 |  | 160,870 |  | 371,059 |  | 340,316 |  | 25,413 |  | 1,863,003 |
Residential mortgage guaranteed by U.S. government agencies |  |  |  |  |  |  |  |  |
Pass | 4,859 |  | 33,880 |  | 34,464 |  | 43,099 |  | 58,264 |  | 226,380 |  | — |  | — |  | 400,946 |
Nonaccrual | — |  | — |  | 545 |  | — |  | 309 |  | 6,887 |  | — |  | — |  | 7,741 |
Total residential mortgage guaranteed by U.S. government agencies | 4,859 |  | 33,880 |  | 35,009 |  | 43,099 |  | 58,573 |  | 233,267 |  | — |  | — |  | 408,687 |
Personal: |  |  |  |  |  |  |  |  |
Pass | 219,873 |  | 200,580 |  | 76,246 |  | 100,229 |  | 64,104 |  | 102,126 |  | 510,571 |  | 1,510 |  | 1,275,239 |
Special Mention | 39 |  | 55 |  | 66 |  | — |  | 469 |  | 31 |  | 965 |  | — |  | 1,625 |
Accruing Substandard | 11 |  | 214 |  | 10 |  | — |  | — |  | — |  | 29 |  | — |  | 264 |
Nonaccrual | 28 |  | 17 |  | 57 |  | 73 |  | 50 |  | 49 |  | 45 |  | — |  | 319 |
Total personal | 219,951 |  | 200,866 |  | 76,379 |  | 100,302 |  | 64,623 |  | 102,206 |  | 511,610 |  | 1,510 |  | 1,277,447 |
Total loans to individuals | 789,816 |  | 384,693 |  | 236,066 |  | 269,115 |  | 284,066 |  | 706,532 |  | 851,926 |  | 26,923 |  | 3,549,137 |
Total loans | $ | 4,855,463 |  | $ | 3,161,473 |  | $ | 2,651,833 |  | $ | 1,788,880 |  | $ | 1,356,476 |  | $ | 3,054,469 |  | $ | 6,108,767 |  | $ | 30,159 |  | $ | 23,007,520 |
Nonaccruing Loans A summary of nonaccruing loans as of December 31, 2021 follows (in thousands):
| Total |  | With No Allowance |  | With Allowance |  | Related Allowance
Commercial: |  |  |  |  |  |  |
Energy | $ | 31,091 |  |  | $ | 31,091 |  |  | $ | — |  |  | $ | — |
Healthcare | 15,762 |  |  | 9,679 |  |  | 6,083 |  |  | 53 |
Services | 17,170 |  |  | 13,686 |  |  | 3,484 |  |  | 2,584 |
General business | 10,081 |  |  | 7,690 |  |  | 2,391 |  |  | 1,357 |
Total commercial | 74,104 |  |  | 62,146 |  |  | 11,958 |  |  | 3,994 |
Commercial real estate | 14,262 |  |  | 6,186 |  |  | 8,076 |  |  | 2,349 |
Loans to individuals: |  |  |  |  |  |  |
Residential mortgage | 31,574 |  |  | 31,574 |  |  | — |  |  | — |
Residential mortgage guaranteed by U.S. government agencies | 13,861 |  |  | 13,861 |  |  | — |  |  | — |
Personal | 258 |  |  | 258 |  |  | — |  |  | — |
Total loans to individuals | 45,693 |  |  | 45,693 |  |  | — |  |  | — |
Total | $ | 134,059 |  |  | $ | 114,025 |  |  | $ | 20,034 |  |  | $ | 6,343 |
A summary of nonaccruing loans as of December 31, 2020 follows (in thousands):
| Total |  | With No Allowance |  | With Allowance |  | Related Allowance
Commercial: |  |  |  |  |  |  |
Energy | $ | 125,059 |  |  | $ | 76,633 |  |  | $ | 48,426 |  |  | $ | 16,478 |
Healthcare | 3,645 |  |  | 3,645 |  |  | — |  |  | — |
Services | 25,598 |  |  | 20,810 |  |  | 4,788 |  |  | 2,574 |
General business | 12,857 |  |  | 12,857 |  |  | — |  |  | — |
Total commercial | 167,159 |  |  | 113,945 |  |  | 53,214 |  |  | 19,052 |
Commercial real estate | 27,246 |  |  | 13,645 |  |  | 13,601 |  |  | 3,389 |
Loans to individuals: |  |  |  |  |  |  |
Residential mortgage | 32,228 |  |  | 32,228 |  |  | — |  |  | — |
Residential mortgage guaranteed by U.S. government agencies | 7,741 |  |  | 7,741 |  |  | — |  |  | — |
Personal | 319 |  |  | 319 |  |  | — |  |  | — |
Total loans to individuals | 40,288 |  |  | 40,288 |  |  | — |  |  | — |
Total | $ | 234,693 |  |  | $ | 167,878 |  |  | $ | 66,815 |  |  | $ | 22,441 |
Troubled Debt Restructurings At December 31, 2021 the Company has $273 million in troubled debt restructurings (TDRs), of which $211 million are accruing residential mortgage loans guaranteed by U.S. government agencies. Of the approximately $141 million TDRs that are performing in accordance with the modified terms, $97 million are government guaranteed loans. The loans designated as TDRs had $994 thousand in charge offs during the year ended December 31, 2021. At December 31, 2020, TDRs totaled $187 million, of which $152 million were accruing residential mortgage loans guaranteed by U.S. government agencies. Approximately $95 million of TDRs were performing. The loans designated as TDRs had $20.9 million in charge offs during the year ended December 31, 2020. TDRs generally consist of interest rate concessions, payment stream concessions or a combination of concessions to distressed borrowers. During the year ended December 31, 2021, $121 million of loans were restructured. During the year ended December 31, 2020, $83 million of loans were restructured. Past Due Loans Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans, as modified for short-term payment deferral forbearance. A summary of loans currently performing and past due as of December 31, 2021 is as follows (in thousands):
|  |  |  | Past Due |  |  |  |
|  | Current |  | 30 to 59 Days |  | 60 to 89 Days |  | 90 Days or More |  | Total |  | Past Due 90 Days or More and Accruing
Commercial: |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 3,002,623 |  |  | $ | 545 |  |  | 3,716 |  |  | $ | — |  |  | $ | 3,006,884 |  |  | $ | — |
Healthcare |  | 3,412,072 |  |  | 2,359 |  |  | — |  |  | 509 |  |  | 3,414,940 |  |  | — |
Services |  | 3,352,639 |  |  | 920 |  |  | 4,620 |  |  | 9,014 |  |  | 3,367,193 |  |  | — |
General business |  | 2,705,596 |  |  | 6,080 |  |  | 997 |  |  | 4,775 |  |  | 2,717,448 |  |  | 199 |
Total commercial |  | 12,472,930 |  |  | 9,904 |  |  | 9,333 |  |  | 14,298 |  |  | 12,506,465 |  |  | 199 |
Commercial real estate |  | 3,827,962 |  |  | — |  |  | 206 |  |  | 3,157 |  |  | 3,831,325 |  |  | — |
Paycheck protection program |  | 276,341 |  |  | — |  |  | — |  |  | — |  |  | 276,341 |  |  | 74 |
Loans to individuals |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 1,707,654 |  |  | 6,263 |  |  | 1,556 |  |  | 6,697 |  |  | 1,722,170 |  |  | — |
Permanent mortgages guaranteed by U.S. government agencies |  | 181,022 |  |  | 26,869 |  |  | 16,751 |  |  | 129,531 |  |  | 354,173 |  |  | 118,819 |
Personal |  | 1,514,938 |  |  | 66 |  |  | 24 |  |  | 178 |  |  | 1,515,206 |  |  | 40 |
Total loans to individuals |  | 3,403,614 |  |  | 33,198 |  |  | 18,331 |  |  | 136,406 |  |  | 3,591,549 |  |  | 118,859 |
Total |  | $ | 19,980,847 |  |  | $ | 43,102 |  |  | $ | 27,870 |  |  | $ | 153,861 |  |  | $ | 20,205,680 |  |  | $ | 119,132 |
A summary of loans currently performing and past due as of December 31, 2020 is as follows (in thousands):
|  |  |  | Past Due |  |  |  |
|  | Current |  | 30 to 59 Days |  | 60 to 89 Days |  | 90 Days or More |  | Total |  | Past Due 90 Days or More and Accruing
Commercial: |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 3,410,995 |  |  | $ | 12,735 |  |  | 4,050 |  |  | $ | 41,414 |  |  | $ | 3,469,194 |  |  | $ | — |
Healthcare |  | 3,302,345 |  |  | — |  |  | — |  |  | 3,645 |  |  | 3,305,990 |  |  | — |
Services |  | 3,489,423 |  |  | 3,278 |  |  | 177 |  |  | 15,705 |  |  | 3,508,583 |  |  | 326 |
General business |  | 2,776,038 |  |  | 1,206 |  |  | 6,277 |  |  | 10,247 |  |  | 2,793,768 |  |  | 4,495 |
Total commercial |  | 12,978,801 |  |  | 17,219 |  |  | 10,504 |  |  | 71,011 |  |  | 13,077,535 |  |  | 4,821 |
Commercial real estate |  | 4,672,279 |  |  | 276 |  |  | 5,310 |  |  | 20,673 |  |  | 4,698,538 |  |  | 5,126 |
Paycheck protection program |  | 1,682,310 |  |  | — |  |  | — |  |  | — |  |  | 1,682,310 |  |  | — |
Loans to individuals |  |  |  |  |  |  |  |  |  |  |  |
Permanent mortgage |  | 1,849,304 |  |  | 5,812 |  |  | 837 |  |  | 7,050 |  |  | 1,863,003 |  |  | 181 |
Permanent mortgages guaranteed by U.S. government agencies |  | 262,102 |  |  | 41,389 |  |  | 22,041 |  |  | 83,155 |  |  | 408,687 |  |  | 78,349 |
Personal |  | 1,273,702 |  |  | 3,317 |  |  | 90 |  |  | 338 |  |  | 1,277,447 |  |  | 241 |
Total loans to individuals |  | 3,385,108 |  |  | 50,518 |  |  | 22,968 |  |  | 90,543 |  |  | 3,549,137 |  |  | 78,771 |
Total |  | $ | 22,718,498 |  |  | $ | 68,013 |  |  | $ | 38,782 |  |  | $ | 182,227 |  |  | $ | 23,007,520 |  |  | $ | 88,718 |
Following is disclosure of loans and the combined allowance for loan losses and accrual for off-balance sheet credit losses under the previous incurred loss model. 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 for the year ended December 31, 2019 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 |  | 57,125 |  |  | (12,046) |  |  | (3,838) |  |  | 3,537 |  |  | (573) |  |  | 44,205 |
Loans charged off |  | (43,185) |  |  | (1,161) |  |  | (288) |  |  | (6,343) |  |  | — |  |  | (50,977) |
Recoveries |  | 2,021 |  |  | 4,986 |  |  | 562 |  |  | 2,505 |  |  | — |  |  | 10,074 |
Ending balance |  | $ | 118,187 |  |  | $ | 51,805 |  |  | $ | 14,400 |  |  | $ | 9,172 |  |  | $ | 17,195 |  |  | $ | 210,759 |
Allowance for off-balance sheet credit losses: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 1,655 |  |  | 52 |  |  | 52 |  |  | 31 |  |  | — |  |  | 1,790 |
Provision for off-balance sheet credit losses |  | (221) |  |  | 55 |  |  | (8) |  |  | (31) |  |  | — |  |  | (205) |
Ending balance |  | $ | 1,434 |  |  | $ | 107 |  |  | $ | 44 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,585 |
Total provision for credit losses |  | $ | 56,904 |  |  | $ | (11,991) |  |  | $ | (3,846) |  |  | $ | 3,506 |  |  | $ | (573) |  |  | $ | 44,000 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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