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Investment Securities Contractual Maturities of Investment Securities (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
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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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