Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Investment securities available for sale
Amortized Cost	$ 630,956	$ 520,826	$ 462,253
Gross Unrealized Gains	7,733	14,240	13,943
Gross Unrealized Losses	(11,891)	(183)	(173)
Fair Value	626,798	534,883	476,023
Government-sponsored entities debt
Investment securities available for sale
Amortized Cost	107,906	87,584	70,654
Gross Unrealized Gains	282	965	892
Gross Unrealized Losses	(5,515)	(31)	(1)
Fair Value	102,673	88,518	71,545
State and municipal obligations
Investment securities available for sale
Amortized Cost	144,359	147,201	134,813
Gross Unrealized Gains	2,161	5,647	5,264
Gross Unrealized Losses	(3,942)	(49)	(44)
Fair Value	142,578	152,799	140,033
Mortgage-backed securities
Investment securities available for sale
Amortized Cost	376,030	285,800	256,398
Gross Unrealized Gains	5,027	7,489	7,654
Gross Unrealized Losses	(2,431)	(102)	(82)
Fair Value	378,626	293,187	263,970
FHLMC preferred stock
Investment securities available for sale
Amortized Cost			148
Gross Unrealized Losses			(46)
Fair Value			102
Corporate stocks
Investment securities available for sale
Amortized Cost	2,661	241	240
Gross Unrealized Gains	263	139	133
Gross Unrealized Losses	(3)	(1)
Fair Value	$ 2,921	$ 379	$ 373

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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