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Investment Securities - Additional Information (Detail) (USD $)			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Maximum	Sep. 30, 2012 Minimum	Sep. 30, 2012 Trust Preferred Securities	Sep. 30, 2012 Trust Preferred Securities Maximum
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Carrying value of securities pledged as collateral	$ 348,748,000	$ 299,478,000
Book value of securities sold under agreements to repurchase	148,486,000	129,311,000
Investment amortized cost	910,502,000	931,388,000			6,000,000
Fair Value of Investments					$ 171,000
Percentage of fair value of investments						1.00%
Spread over LIBOR			1.57%	0.85%

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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