Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Amortized cost and fair value of securities by contractual maturity
Available for Sale Amortized Cost, Due in less than one year	$ 1,200
Available for Sale, Fair Value, Due in less than one year	1,202
Available for Sale, Amortized Cost, Due after one year through five years	818
Available for Sale, Fair Value, Due after one year through five years	842
Available for Sale, Amortized Cost, Due after five years through ten years	1,353
Available for Sale, Fair Value, Due after five years through ten years	1,413
Available for Sale, Amortized Cost, Due after ten years	5,028
Available for Sale, Fair Value, Due after ten years	5,630
Available for Sale, Amortized Cost, Total	8,399
Available for Sale, Fair Value, Total	9,087
Gross Amortized Cost, Securities Available for Sale	644,715	637,940
Fair Value, Available for Sale	649,196	643,050
Mortgage-backed securities of U.S Government Sponsored Entities [Member]
Amortized cost and fair value of securities by contractual maturity
Gross Amortized Cost, Securities Available for Sale	175,283	186,404
Fair Value, Available for Sale	177,401	189,255
Collateralized mortgage obligations of U.S. Government Sponsored Entities [Member]
Amortized cost and fair value of securities by contractual maturity
Gross Amortized Cost, Securities Available for Sale	366,890	352,731
Fair Value, Available for Sale	367,872	354,259
Private collateralized mortgage obligations [Member]
Amortized cost and fair value of securities by contractual maturity
Gross Amortized Cost, Securities Available for Sale	92,643	96,258
Fair Value, Available for Sale	93,298	96,931
No contractual maturity [Member]
Amortized cost and fair value of securities by contractual maturity
Gross Amortized Cost, Securities Available for Sale	1,500
Fair Value, Available for Sale	$ 1,538

Available for sale securities debt maturities aggregate fair value.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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