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Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | $ 153,045 | $ 135,859
Provision for loan losses | 7,952 | 28,500
Charge-offs | (11,364) | (5,778)
Recoveries | 3,423 | 3,299
Net charge-offs | (7,941) | (2,479)
Ending balance | 153,056 | 161,880
Commercial Portfolio Segment [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | 52,915 | 42,993
Provision for loan losses | (4,603) | 3,223
Charge-offs | (3,527) | (1,861)
Recoveries | 798 | 729
Net charge-offs | (2,729) | (1,132)
Ending balance | 45,583 | 45,084
Commercial and industrial, Energy [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | 60,653 | 54,696
Provision for loan losses | 5,365 | 31,288
Charge-offs | (4,278) | (1,011)
Recoveries | 53 | 0
Net charge-offs | (4,225) | (1,011)
Ending balance | 61,793 | 84,973
Commercial Real Estate Portfolio Segment [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | 30,213 | 24,313
Provision for loan losses | 3,751 | (794)
Charge-offs | 0 | (28)
Recoveries | 45 | 96
Net charge-offs | 45 | 68
Ending balance | 34,009 | 23,587
Consumer Real Estate [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | 4,238 | 4,659
Provision for loan losses | 489 | (972)
Charge-offs | (11) | (154)
Recoveries | 107 | 253
Net charge-offs | 96 | 99
Ending balance | 4,823 | 3,786
Consumer and Other [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | 5,026 | 9,198
Provision for loan losses | 2,950 | (4,245)
Charge-offs | (3,548) | (2,724)
Recoveries | 2,420 | 2,221
Net charge-offs | (1,128) | (503)
Ending balance | $ 6,848 | $ 4,450

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -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=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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