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Investment Securities - Additional Information (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Maximum	Jun. 30, 2013 Minimum	Jun. 30, 2013 Trust Preferred Securities	Jun. 30, 2013 Trust Preferred Securities Maximum
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Carrying value of securities pledged as collateral	$ 317,638	$ 335,775
Book value of securities sold under agreements to repurchase	150,396	128,094
Investment amortized cost	911,420	859,124			6,300
Fair value of investments					$ 717
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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