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Loans (Tables) | 3 Months Ended
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Mar. 31, 2017
Receivables [Abstract] |
Loans | Loans were as follows:
| March 31, 2017 |  | Percentage of Total |  | December 31, 2016 |  | Percentage of Total
Commercial and industrial | $ | 4,402,276 |  |  | 36.2 | % |  | $ | 4,344,000 |  |  | 36.3 | %
Energy: |  |  |  |  |  |  |
Production | 982,266 |  |  | 8.0 |  |  | 971,767 |  |  | 8.1 |
Service | 204,797 |  |  | 1.7 |  |  | 221,213 |  |  | 1.8 |
Other | 175,493 |  |  | 1.5 |  |  | 193,081 |  |  | 1.7 |
Total energy | 1,362,556 |  |  | 11.2 |  |  | 1,386,061 |  |  | 11.6 |
Commercial real estate: |  |  |  |  |  |  |
Commercial mortgages | 3,602,100 |  |  | 29.6 |  |  | 3,481,157 |  |  | 29.1 |
Construction | 1,063,894 |  |  | 8.7 |  |  | 1,043,261 |  |  | 8.7 |
Land | 322,790 |  |  | 2.6 |  |  | 311,030 |  |  | 2.6 |
Total commercial real estate | 4,988,784 |  |  | 40.9 |  |  | 4,835,448 |  |  | 40.4 |
Consumer real estate: |  |  |  |  |  |  |
Home equity loans | 346,632 |  |  | 2.8 |  |  | 345,130 |  |  | 2.9 |
Home equity lines of credit | 269,813 |  |  | 2.2 |  |  | 264,862 |  |  | 2.2 |
Other | 332,531 |  |  | 2.7 |  |  | 326,793 |  |  | 2.7 |
Total consumer real estate | 948,976 |  |  | 7.7 |  |  | 936,785 |  |  | 7.8 |
Total real estate | 5,937,760 |  |  | 48.6 |  |  | 5,772,233 |  |  | 48.2 |
Consumer and other | 483,053 |  |  | 4.0 |  |  | 473,098 |  |  | 3.9 |
Total loans | $ | 12,185,645 |  |  | 100.0 | % |  | $ | 11,975,392 |  |  | 100.0 | %
Non-Accrual Loans, Segregated by Class of Loans | Non-accrual loans, segregated by class of loans, were as follows:
| March 31, 2017 |  | December 31, 2016
Commercial and industrial | $ | 26,531 |  |  | $ | 31,475 |
Energy | 78,747 |  |  | 57,571 |
Commercial real estate: |  |  |
Buildings, land and other | 7,608 |  |  | 8,550 |
Construction | — |  |  | — |
Consumer real estate | 2,987 |  |  | 2,130 |
Consumer and other | 303 |  |  | 425 |
Total | $ | 116,176 |  |  | $ | 100,151 |
Age Analysis of Past Due Loans, Segregated by Class of Loans | An age analysis of past due loans (including both accruing and non-accruing loans), segregated by class of loans, as of March 31, 2017 was as follows:
| Loans 30-89 Days Past Due |  | Loans 90 or More Days Past Due |  | Total Past Due Loans |  | Current Loans |  | Total Loans |  | Accruing Loans 90 or More Days Past Due
Commercial and industrial | $ | 20,566 |  |  | $ | 23,787 |  |  | $ | 44,353 |  |  | $ | 4,357,923 |  |  | $ | 4,402,276 |  |  | $ | 3,014 |
Energy | 2,941 |  |  | 29,467 |  |  | 32,408 |  |  | 1,330,148 |  |  | 1,362,556 |  |  | 628 |
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |
Buildings, land and other | 6,243 |  |  | 5,214 |  |  | 11,457 |  |  | 3,913,433 |  |  | 3,924,890 |  |  | 1,834 |
Construction | 2,115 |  |  | 113 |  |  | 2,228 |  |  | 1,061,666 |  |  | 1,063,894 |  |  | 113 |
Consumer real estate | 5,145 |  |  | 2,230 |  |  | 7,375 |  |  | 941,601 |  |  | 948,976 |  |  | 695 |
Consumer and other | 4,598 |  |  | 668 |  |  | 5,266 |  |  | 477,787 |  |  | 483,053 |  |  | 530 |
Total | $ | 41,608 |  |  | $ | 61,479 |  |  | $ | 103,087 |  |  | $ | 12,082,558 |  |  | $ | 12,185,645 |  |  | $ | 6,814 |
Impaired Loans | Impaired loans are set forth in the following table. No interest income was recognized on impaired loans subsequent to their classification as impaired.
| Unpaid Contractual Principal Balance |  | Recorded Investment With No Allowance |  | Recorded Investment With Allowance |  | Total Recorded Investment |  | Related Allowance
March 31, 2017 |  |  |  |  |  |  |  |  |
Commercial and industrial | $ | 35,005 |  |  | $ | 18,113 |  |  | $ | 5,763 |  |  | $ | 23,876 |  |  | $ | 2,751 |
Energy | 84,912 |  |  | 53,313 |  |  | 25,326 |  |  | 78,639 |  |  | 850 |
Commercial real estate: |  |  |  |  |  |  |  |  |
Buildings, land and other | 11,635 |  |  | 6,453 |  |  | — |  |  | 6,453 |  |  | — |
Construction | — |  |  | — |  |  | — |  |  | — |  |  | — |
Consumer real estate | 1,881 |  |  | 1,548 |  |  | — |  |  | 1,548 |  |  | — |
Consumer and other | 75 |  |  | 23 |  |  | — |  |  | 23 |  |  | — |
Total | $ | 133,508 |  |  | $ | 79,450 |  |  | $ | 31,089 |  |  | $ | 110,539 |  |  | $ | 3,601 |
December 31, 2016 |  |  |  |  |  |  |  |  |
Commercial and industrial | $ | 40,288 |  |  | $ | 19,862 |  |  | $ | 9,047 |  |  | $ | 28,909 |  |  | $ | 5,436 |
Energy | 60,522 |  |  | 27,759 |  |  | 29,804 |  |  | 57,563 |  |  | 3,750 |
Commercial real estate: |  |  |  |  |  |  |  |  |
Buildings, land and other | 11,369 |  |  | 6,866 |  |  | — |  |  | 6,866 |  |  | — |
Construction | — |  |  | — |  |  | — |  |  | — |  |  | — |
Consumer real estate | 977 |  |  | 655 |  |  | — |  |  | 655 |  |  | — |
Consumer and other | 32 |  |  | 30 |  |  | — |  |  | 30 |  |  | — |
Total | $ | 113,188 |  |  | $ | 55,172 |  |  | $ | 38,851 |  |  | $ | 94,023 |  |  | $ | 9,186 |
Average Recorded Investment In Impaired Loans | The average recorded investment in impaired loans was as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Commercial and industrial | $ | 26,393 |  |  | $ | 23,809 |
Energy | 68,101 |  |  | 67,615 |
Commercial real estate: |  |  |
Buildings, land and other | 6,660 |  |  | 31,985 |
Construction | — |  |  | 770 |
Consumer real estate | 1,102 |  |  | 471 |
Consumer and other | 27 |  |  | — |
Total | $ | 102,283 |  |  | $ | 124,650 |
Troubled Debt Restructurings | Troubled debt restructurings during the three months ended March 31, 2017 and March 31, 2016 are set forth in the following table.
| Three Months Ended March 31, 2017 |  | Three Months Ended March 31, 2016
| Balance at Restructure |  | Balance at Period-End |  | Balance at Restructure |  | Balance at Period-End
Commercial and industrial | $ | — |  |  | $ | — |  |  | $ | 19 |  |  | $ | 17 |
Energy | 11,262 |  |  | 11,212 |  |  | 62,546 |  |  | 61,095 |
Commercial real estate: |  |  |  |  |  |  |
Construction | — |  |  | — |  |  | 243 |  |  | 235 |
| $ | 11,262 |  |  | $ | 11,212 |  |  | $ | 62,808 |  |  | $ | 61,347 |
Weighted Average Risk Grades for All Commercial Loans by Class | The following tables present weighted-average risk grades for all commercial loans by class.
| March 31, 2017 |  | December 31, 2016
| Weighted Average Risk Grade |  | Loans |  | Weighted Average Risk Grade |  | Loans
Commercial and industrial: |  |  |  |  |  |  |
Risk grades 1-8 | 6.00 |  |  | $ | 3,981,338 |  |  | 6.01 |  |  | $ | 3,989,722 |
Risk grade 9 | 9.00 |  |  | 194,639 |  |  | 9.00 |  |  | 106,988 |
Risk grade 10 | 10.00 |  |  | 87,107 |  |  | 10.00 |  |  | 115,420 |
Risk grade 11 | 11.00 |  |  | 112,511 |  |  | 11.00 |  |  | 100,245 |
Risk grade 12 | 12.00 |  |  | 23,681 |  |  | 12.00 |  |  | 25,939 |
Risk grade 13 | 13.00 |  |  | 3,000 |  |  | 13.00 |  |  | 5,686 |
Total | 6.38 |  |  | $ | 4,402,276 |  |  | 6.35 |  |  | $ | 4,344,000 |
Energy |  |  |  |  |  |  |
Risk grades 1-8 | 6.33 |  |  | $ | 876,206 |  |  | 6.34 |  |  | $ | 854,688 |
Risk grade 9 | 9.00 |  |  | 55,136 |  |  | 9.00 |  |  | 78,524 |
Risk grade 10 | 10.00 |  |  | 152,360 |  |  | 10.00 |  |  | 150,872 |
Risk grade 11 | 11.00 |  |  | 199,479 |  |  | 11.00 |  |  | 244,406 |
Risk grade 12 | 12.00 |  |  | 78,525 |  |  | 12.00 |  |  | 53,821 |
Risk grade 13 | 13.00 |  |  | 850 |  |  | 13.00 |  |  | 3,750 |
Total | 7.86 |  |  | $ | 1,362,556 |  |  | 7.95 |  |  | $ | 1,386,061 |
Commercial real estate: |  |  |  |  |  |  |
Buildings, land and other |  |  |  |  |  |  |
Risk grades 1-8 | 6.69 |  |  | $ | 3,605,460 |  |  | 6.67 |  |  | $ | 3,463,064 |
Risk grade 9 | 9.00 |  |  | 107,441 |  |  | 9.00 |  |  | 109,110 |
Risk grade 10 | 10.00 |  |  | 132,850 |  |  | 10.00 |  |  | 145,067 |
Risk grade 11 | 11.00 |  |  | 71,531 |  |  | 11.00 |  |  | 66,396 |
Risk grade 12 | 12.00 |  |  | 7,608 |  |  | 12.00 |  |  | 8,550 |
Risk grade 13 | 13.00 |  |  | — |  |  | 13.00 |  |  | — |
Total | 6.96 |  |  | $ | 3,924,890 |  |  | 6.95 |  |  | $ | 3,792,187 |
Construction |  |  |  |  |  |  |
Risk grades 1-8 | 7.06 |  |  | $ | 1,037,166 |  |  | 6.97 |  |  | $ | 1,023,194 |
Risk grade 9 | 9.00 |  |  | 21,193 |  |  | 9.00 |  |  | 15,829 |
Risk grade 10 | 10.00 |  |  | 446 |  |  | 10.00 |  |  | 2,889 |
Risk grade 11 | 11.00 |  |  | 5,089 |  |  | 11.00 |  |  | 1,349 |
Risk grade 12 | 12.00 |  |  | — |  |  | 12.00 |  |  | — |
Risk grade 13 | 13.00 |  |  | — |  |  | 13.00 |  |  | — |
Total | 7.12 |  |  | $ | 1,063,894 |  |  | 7.01 |  |  | $ | 1,043,261 |
Net (Charge-Offs)/Recoveries, Segregated by Class of Loans | Net (charge-offs)/recoveries, segregated by class of loans, were as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Commercial and industrial | $ | (2,729 | ) |  | $ | (1,132 | )
Energy | (4,225 | ) |  | (1,011 | )
Commercial real estate: |  |  |
Buildings, land and other | 42 |  |  | 61 |
Construction | 3 |  |  | 7 |
Consumer real estate | 96 |  |  | 99 |
Consumer and other | (1,128 | ) |  | (503 | )
Total | $ | (7,941 | ) |  | $ | (2,479 | )
Unallocated Portion of Allowance for Loan Losses | The following table presents details of the allowance for loan losses allocated to each portfolio segment as of March 31, 2017 and December 31, 2016 and detailed on the basis of the impairment evaluation methodology we used:
| Commercial and Industrial |  | Energy |  | Commercial Real Estate |  | Consumer Real Estate |  | Consumer and Other |  | Total
March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Historical valuation allowances | $ | 26,216 |  |  | $ | 38,666 |  |  | $ | 17,932 |  |  | $ | 2,329 |  |  | $ | 5,297 |  |  | $ | 90,440 |
Specific valuation allowances | 2,751 |  |  | 850 |  |  | — |  |  | — |  |  | — |  |  | 3,601 |
General valuation allowances | 8,072 |  |  | 5,255 |  |  | 6,333 |  |  | 1,939 |  |  | 19 |  |  | 21,618 |
Macroeconomic valuation allowances | 8,544 |  |  | 17,022 |  |  | 9,744 |  |  | 555 |  |  | 1,532 |  |  | 37,397 |
Total | $ | 45,583 |  |  | $ | 61,793 |  |  | $ | 34,009 |  |  | $ | 4,823 |  |  | $ | 6,848 |  |  | $ | 153,056 |
Allocated to loans: |  |  |  |  |  |  |  |  |  |  |
Individually evaluated | $ | 2,751 |  |  | $ | 850 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,601 |
Collectively evaluated | 42,832 |  |  | 60,943 |  |  | 34,009 |  |  | 4,823 |  |  | 6,848 |  |  | 149,455 |
Total | $ | 45,583 |  |  | $ | 61,793 |  |  | $ | 34,009 |  |  | $ | 4,823 |  |  | $ | 6,848 |  |  | $ | 153,056 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Historical valuation allowances | $ | 33,251 |  |  | $ | 34,626 |  |  | $ | 16,976 |  |  | $ | 2,225 |  |  | $ | 4,585 |  |  | $ | 91,663 |
Specific valuation allowances | 5,436 |  |  | 3,750 |  |  | — |  |  | — |  |  | — |  |  | 9,186 |
General valuation allowances | 6,708 |  |  | 3,769 |  |  | 5,004 |  |  | 1,506 |  |  | (144 | ) |  | 16,843 |
Macroeconomic valuation allowances | 7,520 |  |  | 18,508 |  |  | 8,233 |  |  | 507 |  |  | 585 |  |  | 35,353 |
Total | $ | 52,915 |  |  | $ | 60,653 |  |  | $ | 30,213 |  |  | $ | 4,238 |  |  | $ | 5,026 |  |  | $ | 153,045 |
Allocated to loans: |  |  |  |  |  |  |  |  |  |  |
Individually evaluated | $ | 5,436 |  |  | $ | 3,750 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9,186 |
Collectively evaluated | 47,479 |  |  | 56,903 |  |  | 30,213 |  |  | 4,238 |  |  | 5,026 |  |  | 143,859 |
Total | $ | 52,915 |  |  | $ | 60,653 |  |  | $ | 30,213 |  |  | $ | 4,238 |  |  | $ | 5,026 |  |  | $ | 153,045 |
Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology | Our recorded investment in loans as of March 31, 2017 and December 31, 2016 related to each balance in the allowance for loan losses by portfolio segment and detailed on the basis of the impairment methodology we used was as follows:
| Commercial and Industrial |  | Energy |  | Commercial Real Estate |  | Consumer Real Estate |  | Consumer and Other |  | Total
March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Individually evaluated | $ | 23,876 |  |  | $ | 78,639 |  |  | $ | 6,453 |  |  | $ | 1,548 |  |  | $ | 23 |  |  | $ | 110,539 |
Collectively evaluated | 4,378,400 |  |  | 1,283,917 |  |  | 4,982,331 |  |  | 947,428 |  |  | 483,030 |  |  | 12,075,106 |
Total | $ | 4,402,276 |  |  | $ | 1,362,556 |  |  | $ | 4,988,784 |  |  | $ | 948,976 |  |  | $ | 483,053 |  |  | $ | 12,185,645 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Individually evaluated | $ | 28,909 |  |  | $ | 57,563 |  |  | $ | 6,866 |  |  | $ | 655 |  |  | $ | 30 |  |  | $ | 94,023 |
Collectively evaluated | 4,315,091 |  |  | 1,328,498 |  |  | 4,828,582 |  |  | 936,130 |  |  | 473,068 |  |  | 11,881,369 |
Total | $ | 4,344,000 |  |  | $ | 1,386,061 |  |  | $ | 4,835,448 |  |  | $ | 936,785 |  |  | $ | 473,098 |  |  | $ | 11,975,392 |
Activity in Allowance for Loan Losses by Portfolio Segment | The following table details activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017 and 2016. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.
| Commercial and Industrial |  | Energy |  | Commercial Real Estate |  | Consumer Real Estate |  | Consumer and Other |  | Total
Three months ended: |  |  |  |  |  |  |  |  |  |  |
March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 52,915 |  |  | $ | 60,653 |  |  | $ | 30,213 |  |  | $ | 4,238 |  |  | $ | 5,026 |  |  | $ | 153,045 |
Provision for loan losses | (4,603 | ) |  | 5,365 |  |  | 3,751 |  |  | 489 |  |  | 2,950 |  |  | 7,952 |
Charge-offs | (3,527 | ) |  | (4,278 | ) |  | — |  |  | (11 | ) |  | (3,548 | ) |  | (11,364 | )
Recoveries | 798 |  |  | 53 |  |  | 45 |  |  | 107 |  |  | 2,420 |  |  | 3,423 |
Net charge-offs | (2,729 | ) |  | (4,225 | ) |  | 45 |  |  | 96 |  |  | (1,128 | ) |  | (7,941 | )
Ending balance | $ | 45,583 |  |  | $ | 61,793 |  |  | $ | 34,009 |  |  | $ | 4,823 |  |  | $ | 6,848 |  |  | $ | 153,056 |
March 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 42,993 |  |  | $ | 54,696 |  |  | $ | 24,313 |  |  | $ | 4,659 |  |  | $ | 9,198 |  |  | $ | 135,859 |
Provision for loan losses | 3,223 |  |  | 31,288 |  |  | (794 | ) |  | (972 | ) |  | (4,245 | ) |  | 28,500 |
Charge-offs | (1,861 | ) |  | (1,011 | ) |  | (28 | ) |  | (154 | ) |  | (2,724 | ) |  | (5,778 | )
Recoveries | 729 |  |  | — |  |  | 96 |  |  | 253 |  |  | 2,221 |  |  | 3,299 |
Net charge-offs | (1,132 | ) |  | (1,011 | ) |  | 68 |  |  | 99 |  |  | (503 | ) |  | (2,479 | )
Ending balance | $ | 45,084 |  |  | $ | 84,973 |  |  | $ | 23,587 |  |  | $ | 3,786 |  |  | $ | 4,450 |  |  | $ | 161,880 |

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- Definition Tabular disclosure of nonaccrual and past due financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
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- Definition Tabular disclosure of financing receivables and troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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