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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Investment securities held to maturity
Amortized Cost	$ 14,598
Fair Value	15,555	16,553	17,664
State and municipal obligations
Investment securities held to maturity
Amortized Cost	14,598	15,440	16,568
Gross Unrealized Gains	957	1,113	1,096
Fair Value	$ 15,555	$ 16,553	$ 17,664

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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