Investments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Amortized cost and approximate fair values of investment securities held-to-maturity :
Amortized Cost	$ 47,328	$ 35,370
Gross Unrealized Gains	445	988
Gross Unrealized Losses	(1,844)	(140)
Fair Value	45,929	36,218
Municipal securities
Amortized cost and approximate fair values of investment securities held-to-maturity :
Amortized Cost	47,328	35,370
Gross Unrealized Gains	445	988
Gross Unrealized Losses	(1,844)	(140)
Fair Value	$ 45,929	$ 36,218

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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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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- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value 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 loss.

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