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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held for Investment		$ 39,806,031	$ 38,359,022
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held for Investment	[1]	2,326,679	2,040,574
Commercial and Industrial | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held for Investment		1,622,983	1,377,964
Lease financing, unearned income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unearned income		55,056	65,041
Loans Held for Investment		703,696	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		1,800,000	1,500,000
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held for Investment		$ 482,400	$ 500,800
[1] Includes lease financing receivables, all of which were classified as Pass.

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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.

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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)
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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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