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Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013 Securities	Jun. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Securities issued by U.S. government percentage	75.00%			75.00%
Number of securities		13
Investment securities, par value		$ 94,200,000
Pre-tax gain on sale of securities		$ 2,100,000		$ 2,094,000
Gains (loss) recognized				0
Gross Unrealized Holding Losses	0			0
Book value of the bond	1,909,000			1,909,000	2,050,000
Credit-related impairment loss on investment securities held-to-maturity
Average life of investment grade debt securities, years				4 years 6 months
Investment securities pledged as collateral	2,340,000,000			2,340,000,000	2,240,000,000
Government agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Agency bond callable				144,800,000
CMO's / REMIC's - residential [Member]
Schedule of Available-for-sale Securities [Line Items]
CMO/REMIC's backed by whole loans issued by private-label companies (non-government sponsored)	828,000			828,000	1,200,000
Investment security classified as held-to-maturity, number	1			1
Held-to-Maturity securities, average FICO score	715			715
Held-to-Maturity securities, acquired price, percentage	98.25%			98.25%
Average percentage of LTV	71.00%			71.00%
Current fair value percentage of Held-to-Maturity security against par value	70.00%			70.00%
Investment contractual cash flows guaranteed by Government, percentage	99.94%			99.94%
Investment contractual cash flows guaranteed by banks, percentage	0.06%			0.06%
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Average life of investment grade debt securities, years				9 years 3 months 18 days
Alt-A bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Book value of the bond	1,900,000			1,900,000
Net impairment losses	$ 1,900,000			$ 1,900,000

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Callable Securities At Carrying Value

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Investment contractual cash flows guaranteed by banks.

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Investment contractual cash flows guaranteed by government.

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Investment securities pledged as collateral.

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Securities backed by whole loans.

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Securities issued by US Government percentage.

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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