Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	$ 415,493	$ 387,642
Gross Unrealized Gains	14,381	12,752
Gross Unrealized Losses	(29)	(365)
Fair Value	429,845	400,029
U.S. Treasury and U.S. government sponsored entities [Member]
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	70,465	53,689
Gross Unrealized Gains	1,830	2,300
Gross Unrealized Losses	(15)	(1)
Fair Value	72,280	55,988
State and political subdivisions [Member]
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	78,643	78,288
Gross Unrealized Gains	5,357	4,446
Gross Unrealized Losses	(9)	(44)
Fair Value	83,991	82,690
Corporate bonds [Member]
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	1,232	758
Gross Unrealized Gains	17	11
Gross Unrealized Losses	0	0
Fair Value	1,249	769
Mortgage-backed securities-residential [Member]
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	247,330	217,644
Gross Unrealized Gains	6,829	5,384
Gross Unrealized Losses	0	(310)
Fair Value	254,159	222,718
Collateralized mortgage obligations [Member]
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	17,504	36,806
Gross Unrealized Gains	209	416
Gross Unrealized Losses	0	0
Fair Value	17,713	37,222
Small business administration [Member]
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	179	318
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	(4)
Fair Value	180	315
Equity securities [Member]
Amortized cost and fair value of the available-for-sale investment securities
Amortized Cost	140	139
Gross Unrealized Gains	138	194
Gross Unrealized Losses	(5)	(6)
Fair Value	$ 273	$ 327

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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