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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | $ 38,359,022 | $ 37,356,201
Commercial and Industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans | [1] | 2,040,574 | 1,900,445
Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | 1,377,964 | 1,341,216
Lease financing, unearned income |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unearned income |  | 65,041 | 60,278
Non-Covered Loans |  | 662,610 | 559,229
Specialty Finance Loans | Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | 1,500,000 | 1,300,000
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | $ 500,800 | $ 632,900
[1] | (1) Includes lease financing receivables, all of which were classified as "pass."

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts 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 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 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) -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 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 + Details
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