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Acquisitions - Expenditures Related to Acquisition (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Noninterest Expense	$ 173,239	$ 163,947	$ 344,750	$ 321,888
Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Noninterest Expense		$ 4,800		$ 6,000

X

- 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.

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X

- Definition

Total aggregate amount of all noninterest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 225



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-04.14)



-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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