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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost $ 172,251 $ 143,320 $ 154,256
Unrealized Gains 3,779 7,128 8,157
Unrealized Losses (9,761) (201) (31)
Fair Value (Estimated) 166,269 150,247 162,382
US Treasury and Government [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 92,226 60,919 65,859
Unrealized Gains 11 242 390
Unrealized Losses (8,684) (182) (21)
Fair Value (Estimated) 83,553 60,979 66,228
Collateralized Mortgage Backed Securities [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 37,915 39,193 44,236
Unrealized Gains 1,701 2,850 3,400
Unrealized Losses (997) (19) (10)
Fair Value (Estimated) 38,619 42,024 47,626
US States and Political Subdivisions Debt Securities [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 41,810 42,908 43,861
Unrealized Gains 2,067 4,036 4,367
Unrealized Losses (80) 0 0
Fair Value (Estimated) 43,797 46,944 48,228
Corporate Debt Securities [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 300 300 300
Unrealized Gains 0 0 0
Unrealized Losses 0 0 0
Fair Value (Estimated) $ 300 $ 300 $ 300