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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | $ 135,859 | $ 99,542 | $ 92,438
Provision for loan losses | 51,673 | 51,845 | 16,314
Charge-offs | (48,328) | (29,572) | (28,485)
Recoveries | 13,841 | 14,044 | 19,275
Net charge-offs | (34,487) | (15,528) | (9,210)
Ending balance | 153,045 | 135,859 | 99,542
Individually evaluated for impairment | 9,186 | 4,378 | 1,680
Collectively evaluated for impairment | 143,859 | 131,481 | 97,862
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 42,993 | 44,273 | 46,700
Provision for loan losses | 22,181 | 5,255 | 484
Charge-offs | (15,910) | (11,092) | (12,073)
Recoveries | 3,651 | 4,557 | 9,162
Net charge-offs | (12,259) | (6,535) | (2,911)
Ending balance | 52,915 | 42,993 | 44,273
Individually evaluated for impairment | 5,436 | 2,378 | 1,613
Collectively evaluated for impairment | 47,479 | 40,615 | 42,660
Commercial And Industrial Energy Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 54,696 | 14,919 | 6,090
Provision for loan losses | 24,545 | 45,774 | 10,066
Charge-offs | (18,644) | (6,000) | (1,747)
Recoveries | 56 | 3 | 510
Net charge-offs | (18,588) | (5,997) | (1,237)
Ending balance | 60,653 | 54,696 | 14,919
Individually evaluated for impairment | 3,750 | 2,000 | 67
Collectively evaluated for impairment | 56,903 | 52,696 | 14,852
Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 24,313 | 27,163 | 22,590
Provision for loan losses | 5,064 | (3,182) | 6,573
Charge-offs | (82) | (657) | (3,800)
Recoveries | 918 | 989 | 1,800
Net charge-offs | 836 | 332 | (2,000)
Ending balance | 30,213 | 24,313 | 27,163
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 30,213 | 24,313 | 27,163
Residential Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 4,659 | 5,178 | 5,230
Provision for loan losses | (164) | (428) | 681
Charge-offs | (814) | (577) | (1,097)
Recoveries | 557 | 486 | 364
Net charge-offs | (257) | (91) | (733)
Ending balance | 4,238 | 4,659 | 5,178
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 4,238 | 4,659 | 5,178
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 9,198 | 8,009 | 5,010
Provision for loan losses | 47 | 4,426 | 5,328
Charge-offs | (12,878) | (11,246) | (9,768)
Recoveries | 8,659 | 8,009 | 7,439
Net charge-offs | (4,219) | (3,237) | (2,329)
Ending balance | 5,026 | 9,198 | 8,009
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 5,026 | 9,198 | 8,009
Unallocated [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 0 | 0 | 6,818
Provision for loan losses | 0 | 0 | (6,818)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Net charge-offs | 0 | 0 | 0
Ending balance | 0 | 0 | 0
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | $ 0 | $ 0 | $ 0

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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 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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