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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held for Investment |  | $ 39,418,757 | $ 38,359,022
Commercial and Industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held for Investment | [1] | 2,170,439 | 2,040,574
Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held for Investment |  | 1,535,618 | 1,377,964
Lease financing, unearned income |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unearned income |  | 59,088 | 65,041
Loans Held for Investment |  | 634,821 | 662,610
Specialty Finance Loans and Leases [Member] | Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held for Investment |  | 1,700,000 | 1,700,000
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held for Investment |  | $ 491,700 | $ 500,800
[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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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