Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ Details

- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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+ Details

Investment securities available- for-sale - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended					6 Months Ended	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Other Securities [Member]	Dec. 31, 2012 Other Securities [Member]	Jun. 30, 2012 Available For Sale Securities Member	Jun. 30, 2013 E V E R T E C Inc [Member] IPO Member	Mar. 31, 2013 E V E R T E C Inc [Member] IPO Member Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment Losses, Investments	$ 0	$ 0
Proceeds From Sale Of Available For Sale Securities Settled After Period Of Sale								8,000,000
Investment securities available-for-sale, at fair value	5,114,636,000		5,114,636,000		5,084,201,000	12,556,000	35,573,000			22,800,000
Net Gain Loss And Valuation Adjustments On Investment Securities	$ 5,856,000	$ (349,000)	$ 5,856,000	$ (349,000)					$ 5,800,000