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Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | $ 136,350 | $ 149,885 | $ 132,132 | $ 155,364
Provision for loan losses | 6,400 | 8,251 | 17,403 | 15,196
Charge-offs | (11,650) | (11,932) | (21,873) | (28,730)
Recoveries | 3,829 | 4,022 | 7,267 | 8,396
Net charge-offs | (7,821) | (7,910) | (14,606) | (20,334)
Ending balance | 134,929 | 150,226 | 134,929 | 150,226
Commercial Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 58,571 | 57,733 | 48,580 | 59,614
Provision for loan losses | 1,597 | 3,528 | 13,526 | 9,322
Charge-offs | (3,389) | (4,153) | (6,077) | (13,405)
Recoveries | 935 | 605 | 1,685 | 2,182
Net charge-offs | (2,454) | (3,548) | (4,392) | (11,223)
Ending balance | 57,714 | 57,713 | 57,714 | 57,713
Commercial and industrial, Energy [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 25,343 | 39,039 | 29,052 | 51,528
Provision for loan losses | 2,446 | 350 | (1,310) | (9,290)
Charge-offs | (2,000) | (2,689) | (2,000) | (5,539)
Recoveries | 29 | 613 | 76 | 614
Net charge-offs | (1,971) | (2,076) | (1,924) | (4,925)
Ending balance | 25,818 | 37,313 | 25,818 | 37,313
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 36,455 | 38,474 | 38,777 | 30,948
Provision for loan losses | (13) | 840 | (2,365) | 8,283
Charge-offs | (557) | (614) | (617) | (619)
Recoveries | 29 | 218 | 119 | 306
Net charge-offs | (528) | (396) | (498) | (313)
Ending balance | 35,914 | 38,918 | 35,914 | 38,918
Consumer Real Estate [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 5,661 | 6,349 | 6,103 | 5,657
Provision for loan losses | 262 | 151 | 1,509 | 1,369
Charge-offs | (601) | (482) | (2,379) | (1,201)
Recoveries | 315 | 318 | 404 | 511
Net charge-offs | (286) | (164) | (1,975) | (690)
Ending balance | 5,637 | 6,336 | 5,637 | 6,336
Consumer and Other [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 10,320 | 8,290 | 9,620 | 7,617
Provision for loan losses | 2,108 | 3,382 | 6,043 | 5,512
Charge-offs | (5,103) | (3,994) | (10,800) | (7,966)
Recoveries | 2,521 | 2,268 | 4,983 | 4,783
Net charge-offs | (2,582) | (1,726) | (5,817) | (3,183)
Ending balance | $ 9,846 | $ 9,946 | $ 9,846 | $ 9,946

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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