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Investment Securities Contractual Maturities of Investment Securities (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 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 | $ 1,345,000 | $ 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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