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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | $ 153,045 | $ 135,859 | $ 99,542
Provision for loan losses | 35,460 | 51,673 | 51,845
Charge-offs | (47,804) | (48,328) | (29,572)
Recoveries | 14,663 | 13,841 | 14,044
Net charge-offs | (33,141) | (34,487) | (15,528)
Ending balance | 155,364 | 153,045 | 135,859
Individually evaluated for impairment | 20,820 | 9,186 | 4,378
Collectively evaluated for impairment | 134,544 | 143,859 | 131,481
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 52,915 | 42,993 | 44,273
Provision for loan losses | 24,152 | 22,181 | 5,255
Charge-offs | (20,619) | (15,910) | (11,092)
Recoveries | 3,166 | 3,651 | 4,557
Net charge-offs | (17,453) | (12,259) | (6,535)
Ending balance | 59,614 | 52,915 | 42,993
Individually evaluated for impairment | 7,553 | 5,436 | 2,378
Collectively evaluated for impairment | 52,061 | 47,479 | 40,615
Commercial And Industrial Energy Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 60,653 | 54,696 | 14,919
Provision for loan losses | 884 | 24,545 | 45,774
Charge-offs | (10,595) | (18,644) | (6,000)
Recoveries | 586 | 56 | 3
Net charge-offs | (10,009) | (18,588) | (5,997)
Ending balance | 51,528 | 60,653 | 54,696
Individually evaluated for impairment | 13,267 | 3,750 | 2,000
Collectively evaluated for impairment | 38,261 | 56,903 | 52,696
Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 30,213 | 24,313 | 27,163
Provision for loan losses | (11) | 5,064 | (3,182)
Charge-offs | (86) | (82) | (657)
Recoveries | 832 | 918 | 989
Net charge-offs | 746 | 836 | 332
Ending balance | 30,948 | 30,213 | 24,313
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 30,948 | 30,213 | 24,313
Residential Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 4,238 | 4,659 | 5,178
Provision for loan losses | 1,925 | (164) | (428)
Charge-offs | (925) | (814) | (577)
Recoveries | 419 | 557 | 486
Net charge-offs | (506) | (257) | (91)
Ending balance | 5,657 | 4,238 | 4,659
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 5,657 | 4,238 | 4,659
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 5,026 | 9,198 | 8,009
Provision for loan losses | 8,510 | 47 | 4,426
Charge-offs | (15,579) | (12,878) | (11,246)
Recoveries | 9,660 | 8,659 | 8,009
Net charge-offs | (5,919) | (4,219) | (3,237)
Ending balance | 7,617 | 5,026 | 9,198
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | $ 7,617 | $ 5,026 | $ 9,198

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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=84173941&loc=SL6953423-111524 + 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=84173941&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=84173941&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=84173941&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=82894903&loc=d3e15032-111544 + Details
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