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Investment Securities Contractual Maturities of Investment Securities (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 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	$ 1,345,000	$ 18,761,000	$ 4,296,000
Due in 1 to 5 years, Securities available for sale, Amortized Cost	139,000	27,243,000	55,317,000
Due in 5 to 10 years, Securities available for sale, Amortized Cost	2,426,000	16,686,000	23,143,000
Due after 10 years, Securities available for sale, Amortized Cost	287,489,000	215,131,000	211,149,000
Equity securities, Amortized Cost	1,617,000	1,578,000	1,863,000
Securities available for sale, Amortized Cost	293,016,000	279,399,000	295,768,000
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)	1,368,000	18,926,000	4,328,000
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	140,000	27,816,000	56,358,000
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	2,563,000	17,666,000	24,034,000
Due after 10 years, Securities available for sale, Fair Value (Estimated)	281,992,000	225,629,000	220,852,000
Equity securities, Fair Value (Estimated)	1,672,000	1,577,000	1,775,000
Fair Value (Estimated)	287,735,000	291,614,000	307,347,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	24,873,000	27,461,000	21,137,000
Due in 1 year or less, Securities available to be held to maturity, Amortized Cost	766,000	3,754,000	1,382,000
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	6,081,000	11,950,000	13,556,000
Due after 10 years, Securities to be held to maturity, Amortized Cost	145,544,000	100,155,000	99,700,000
Securities to be held to maturity, Amortized Cost	177,264,000	143,320,000	135,775,000
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)	773,000	3,785,000	1,399,000
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	6,462,000	12,701,000	14,134,000
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	26,299,000	29,986,000	22,958,000
Due after 10 years, Securiteis to be held to maturity, Fair Value (Estimated)	141,256,000	103,775,000	105,137,000
Fair Value (Estimated)	$ 174,790,000	$ 150,247,000	$ 143,628,000

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