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Investment Securities Contractual Maturities of Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Amortized Cost	$ 13,854	$ 18,761	$ 5,894
Due in 1 to 5 years, Securities available for sale, Amortized Cost	24,804	27,243	59,887
Due in 5 to 10 years, Securities available for sale, Amortized Cost	13,683	16,686	13,014
Due after 10 years, Securities available for sale, Amortized Cost	224,029	215,131	225,548
Equity securities, Amortized Cost	1,578	1,578	1,863
Securities available for sale, Amortized Cost	277,948	279,399	306,206
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Fair Value (Estimated)	14,054	18,926	5,948
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	25,288	27,816	60,971
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	14,560	17,666	13,442
Due after 10 years, Securities available for sale, Fair Value (Estimated)	230,895	225,629	234,916
Equity securities, Fair Value (Estimated)	1,572	1,577	1,834
Fair Value (Estimated)	286,369	291,614	317,111
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	27,914	27,461	35,563
Due in 1 year or less, Securities available to be held to maturity, Amortized Cost	3,034	3,754	4,663
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	22,651	11,950	12,173
Due after 10 years, Securities to be held to maturity, Amortized Cost	97,192	100,155	85,207
Securities to be held to maturity, Amortized Cost	150,791	143,320	137,606
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available to be held to maturity, Fair Value (Estimated)	3,065	3,785	4,710
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	23,118	12,701	12,940
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	30,237	29,986	38,100
Due after 10 years, Securiteis to be held to maturity, Fair Value (Estimated)	100,132	103,775	88,883
Fair Value (Estimated)	$ 156,552	$ 150,247	$ 144,633

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