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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	$ 530,146	$ 491,615
Unrealized Gains	13,789	12,559
Unrealized Losses	(17,328)	(21,744)
Fair Value	526,607	482,430
OTTI in AOCI(1)	(5,607)	(5,950)
Municipal securities [Member]
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	144,940	131,498
Unrealized Gains	7,249	6,317
Unrealized Losses	(198)
Fair Value	151,991	137,815
Single Issue Trust Preferred Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	55,678	55,649
Unrealized Losses	(11,172)	(15,405)
Fair Value	44,506	40,244
Corporate FDIC Insured Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	13,540	13,685
Unrealized Gains	10	33
Unrealized Losses
Fair Value	13,550	13,718
Mortgage-Backed Securities Agency [Member]
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	300,036	274,384
Unrealized Gains	6,310	6,003
Unrealized Losses	(257)	(285)
Fair Value	306,089	280,102
Mortgage-Backed Securities Non-Agency Alt-A Residential [Member]
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	15,533	15,980
Unrealized Losses	(5,607)	(5,950)
Fair Value	9,926	10,030
OTTI in AOCI(1)	(5,607)	(5,950)
Total Mortgage-Backed Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	315,569	290,364
Unrealized Gains	6,310	6,003
Unrealized Losses	(5,864)	(6,235)
Fair Value	316,015	290,132
OTTI in AOCI(1)	(5,607)	(5,950)
Equity Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities, including gross unrealized gains and losses
Amortized Cost	419	419
Unrealized Gains	220	206
Unrealized Losses	(94)	(104)
Fair Value	545	521
OTTI in AOCI(1)

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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 available-for-sale 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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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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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