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Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | $ 149,714 | $ 106,607 | $ 135,859 | $ 99,542
Provision for loan losses | 5,045 | 6,810 | 42,734 | 17,845
Charge-offs | (8,516) | (7,604) | (39,194) | (18,186)
Recoveries | 3,530 | 4,560 | 10,374 | 11,172
Net charge-offs | (4,986) | (3,044) | (28,820) | (7,014)
Ending balance | 149,773 | 110,373 | 149,773 | 110,373
Commercial Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 47,578 | 42,425 | 42,993 | 44,273
Provision for loan losses | 4,632 | 2,909 | 14,315 | 3,596
Charge-offs | (4,036) | (4,074) | (10,754) | (8,580)
Recoveries | 957 | 1,959 | 2,577 | 3,930
Net charge-offs | (3,079) | (2,115) | (8,177) | (4,650)
Ending balance | 49,131 | 43,219 | 49,131 | 43,219
Commercial and industrial, Energy [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 66,339 | 26,300 | 54,696 | 14,919
Provision for loan losses | (3,231) | 1,284 | 26,170 | 12,662
Charge-offs | (884) | 0 | (18,644) | 0
Recoveries | 19 | 0 | 21 | 3
Net charge-offs | (865) | 0 | (18,623) | 3
Ending balance | 62,243 | 27,584 | 62,243 | 27,584
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 27,063 | 24,935 | 24,313 | 27,163
Provision for loan losses | 1,886 | 746 | 4,085 | (1,470)
Charge-offs | (9) | (107) | (56) | (585)
Recoveries | 277 | 309 | 875 | 775
Net charge-offs | 268 | 202 | 819 | 190
Ending balance | 29,217 | 25,883 | 29,217 | 25,883
Consumer Real Estate [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 3,935 | 4,702 | 4,659 | 5,178
Provision for loan losses | 427 | 324 | (470) | (205)
Charge-offs | (287) | (423) | (464) | (524)
Recoveries | 92 | 201 | 442 | 355
Net charge-offs | (195) | (222) | (22) | (169)
Ending balance | 4,167 | 4,804 | 4,167 | 4,804
Consumer and Other [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 4,799 | 8,245 | 9,198 | 8,009
Provision for loan losses | 1,331 | 1,547 | (1,366) | 3,262
Charge-offs | (3,300) | (3,000) | (9,276) | (8,497)
Recoveries | 2,185 | 2,091 | 6,459 | 6,109
Net charge-offs | (1,115) | (909) | (2,817) | (2,388)
Ending balance | $ 5,015 | $ 8,883 | $ 5,015 | $ 8,883

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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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