Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair value of securities
Total available for sale investment securities, Amortized Cost	$ 477,196	$ 463,306
Gross Unrealized Gains	11,113	19,663
Gross Unrealized Losses	(5,856)	(168)
Available-for-sale Securities, Fair Value	482,453	482,801
Held-to-maturity, Amortized Cost	9,910
Held-to-maturity, Fair Value	9,910
U.S. Treasury and federal agencies [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	39,071	51,458
Gross Unrealized Gains	150	351
Gross Unrealized Losses	(614)	(30)
Available-for-sale Securities, Fair Value	38,607	51,779
State and municipal [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	176,838	162,147
Gross Unrealized Gains	5,949	10,842
Gross Unrealized Losses	(2,420)	(84)
Available-for-sale Securities, Fair Value	180,367	172,905
Held-to-maturity, Amortized Cost	9,910
Held-to-maturity, Gross Unrealized Gains
Held-to-maturity, Gross Unrealized Losses
Held-to-maturity, Fair Value	9,910
Federal agency collateralized mortgage obligations [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	108,607	95,337
Gross Unrealized Gains	1,366	1,533
Gross Unrealized Losses	(1,170)	(39)
Available-for-sale Securities, Fair Value	108,803	96,831
Federal agency mortgage-backed pools [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	151,146	152,372
Gross Unrealized Gains	3,583	6,847
Gross Unrealized Losses	(1,652)	(15)
Available-for-sale Securities, Fair Value	153,077	159,204
Private labeled mortgage-backed pools [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	1,502	1,960
Gross Unrealized Gains	52	71
Available-for-sale Securities, Fair Value	1,554	2,031
Corporate notes [Member]
Fair value of securities
Total available for sale investment securities, Amortized Cost	32	32
Gross Unrealized Gains	13	19
Available-for-sale Securities, Fair Value	$ 45	$ 51

Available for sale securities gross unrealized gains accumulated in investments.

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Available for sale securities gross unrealized loss accumulated in investments.

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Held-to-maturity securities gross unrealized gains.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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