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Investment Securities Contractual Maturities of Investment Securities (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 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	$ 1,755,000	$ 18,761,000	$ 4,592,000
Due in 1 to 5 years, Securities available for sale, Amortized Cost	14,249,000	27,243,000	50,173,000
Due in 5 to 10 years, Securities available for sale, Amortized Cost	18,808,000	16,686,000	16,908,000
Due after 10 years, Securities available for sale, Amortized Cost	287,955,000	215,131,000	212,067,000
Equity securities, Amortized Cost	1,614,000	1,578,000	1,563,000
Securities available for sale, Amortized Cost	324,381,000	279,399,000	285,303,000
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)	1,775,000	18,926,000	4,652,000
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	14,473,000	27,816,000	51,286,000
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	19,199,000	17,666,000	17,965,000
Due after 10 years, Securities available for sale, Fair Value (Estimated)	280,780,000	225,629,000	224,489,000
Equity securities, Fair Value (Estimated)	1,673,000	1,577,000	1,508,000
Fair Value (Estimated)	317,900,000	291,614,000	299,900,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	33,863,000	27,461,000	20,519,000
Due in 1 year or less, Securities available to be held to maturity, Amortized Cost	717,000	3,754,000	1,376,000
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	6,559,000	11,950,000	11,046,000
Due after 10 years, Securities to be held to maturity, Amortized Cost	131,112,000	100,155,000	121,315,000
Securities to be held to maturity, Amortized Cost	172,251,000	143,320,000	154,256,000
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)	726,000	3,785,000	1,380,000
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	6,955,000	12,701,000	11,569,000
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	34,692,000	29,986,000	22,376,000
Due after 10 years, Securiteis to be held to maturity, Fair Value (Estimated)	123,896,000	103,775,000	127,057,000
Fair Value (Estimated)	$ 166,269,000	$ 150,247,000	$ 162,382,000

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