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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 293,016,000 $ 279,399,000 $ 295,768,000
Unrealized Gains 4,032,000 12,753,000 12,015,000
Unrealized Losses (9,313,000) (538,000) (436,000)
Fair Value (Estimated) 287,735,000 291,614,000 307,347,000
Collateralized Mortgage Backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 157,023,000 164,752,000 201,552,000
Unrealized Gains 2,014,000 4,636,000 5,677,000
Unrealized Losses (1,513,000) (295,000) (250,000)
Fair Value (Estimated) 157,524,000 169,093,000 206,979,000
US States and Political Subdivisions Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 134,376,000 113,069,000 92,353,000
Unrealized Gains 1,955,000 8,074,000 6,291,000
Unrealized Losses (7,792,000) (199,000) (51,000)
Fair Value (Estimated) 128,539,000 120,944,000 98,593,000
Equity Securities, Other [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,617,000 1,578,000 1,863,000
Unrealized Gains 63,000 43,000 47,000
Unrealized Losses (8,000) (44,000) (135,000)
Fair Value (Estimated) $ 1,672,000 $ 1,577,000 $ 1,775,000