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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 324,381,000 $ 279,399,000 $ 285,303,000
Unrealized Gains 3,882,000 12,753,000 14,820,000
Unrealized Losses (10,363,000) (538,000) (223,000)
Fair Value (Estimated) 317,900,000 291,614,000 299,900,000
Collateralized Mortgage Backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 187,789,000 164,752,000 183,126,000
Unrealized Gains 2,117,000 4,636,000 6,408,000
Unrealized Losses (1,650,000) (295,000) (97,000)
Fair Value (Estimated) 188,256,000 169,093,000 189,437,000
US States and Political Subdivisions Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 134,978,000 113,069,000 100,614,000
Unrealized Gains 1,703,000 8,074,000 8,363,000
Unrealized Losses (8,710,000) (199,000) (22,000)
Fair Value (Estimated) 127,971,000 120,944,000 108,955,000
Equity Securities, Other [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,614,000 1,578,000 1,563,000
Unrealized Gains 62,000 43,000 49,000
Unrealized Losses (3,000) (44,000) (104,000)
Fair Value (Estimated) $ 1,673,000 $ 1,577,000 $ 1,508,000