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Investment securities - Additional Information (Detail) (USD $)	3 Months Ended		3 Months Ended
	Mar. 31, 2013 Investment	Dec. 31, 2012	Mar. 31, 2013 Privately issued mortgage-backed securities [Member]	Mar. 31, 2012 Privately issued mortgage-backed securities [Member]
Investment Holdings [Line Items]
Pre-tax other-than-temporary impairment losses			$ 10,000,000	$ 11,000,000
Number of investment securities with aggregate gross unrealized losses	241
Unrealized losses on individual investment securities	202,193,000	252,179,000
Unrealized losses on privately issued residential mortgage-backed securities	179,000,000
Residential mortgage-backed securities at cost	1,100,000,000
Unrealized losses on trust preferred securities issued by financial institutions and securities backed by trust preferred securities	23,000,000
Trust preferred securities issued by financial institutions and securities backed by trust preferred securities cost	130,000,000
Cost Method Investment Securities	$ 301,000,000

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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