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Investment Securities, Amortized Cost, Estimated Values and Gross Unrealized Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale [Abstract]    
Amortized Cost $ 385,781 $ 279,209
Gross Unrealized Gains 16,795 21,148
Gross Unrealized Losses (223) (1,153)
Estimated Fair Value 402,353 299,204
Held-to-maturity [Abstract]    
Estimated Fair Value 8,861 10,161
Total investment securities [Abstract]    
Total Amortized Cost 393,816 288,524
Total Gross Unrealized Gains 17,621 21,994
Total Gross Unrealized Losses (223) (1,153)
Total Fair Value 411,214 309,365
Obligations of States and Political Subdivisions [Member]
   
Held-to-maturity [Abstract]    
Amortized Cost 8,035 9,315
Gross Unrealized Gains 826 846
Gross Unrealized Losses 0 0
Estimated Fair Value 8,861 10,161
U.S. Treasury Securities [Member]
   
Available-for-sale [Abstract]    
Amortized Cost 500 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 500 0
U.S. Government Agency Securities [Member]
   
Available-for-sale [Abstract]    
Amortized Cost 65,085 0
Gross Unrealized Gains 70 0
Gross Unrealized Losses (77) 0
Estimated Fair Value 65,078 0
Obligations of States and Political Subdivisions [Member]
   
Available-for-sale [Abstract]    
Amortized Cost 155,121 156,663
Gross Unrealized Gains 13,314 15,329
Gross Unrealized Losses 0 0
Estimated Fair Value 168,435 171,992
Collateralized Mortgage Obligations [Member]
   
Available-for-sale [Abstract]    
Amortized Cost 87,624 122,155
Gross Unrealized Gains 2,148 5,768
Gross Unrealized Losses (80) (1,153)
Estimated Fair Value 89,692 126,770
Mortgage-Backed Securities [Member]
   
Available-for-sale [Abstract]    
Amortized Cost 61,750 391
Gross Unrealized Gains 766 51
Gross Unrealized Losses (66) 0
Estimated Fair Value 62,450 442
Corporate Bonds [Member]
   
Available-for-sale [Abstract]    
Amortized Cost 15,701 0
Gross Unrealized Gains 497 0
Gross Unrealized Losses 0 0
Estimated Fair Value $ 16,198 $ 0