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Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Amortized cost and fair value of securities by contractual maturity    
Held for Investment, Amortized Cost, Due in less than one year $ 0  
Held for Investment, Fair Value, Due in less than one year 0  
Available for Sale Amortized Cost, Due in less than one year 1,699  
Available for Sale, Fair Value, Due in less than one year 1,714  
Held for Investment, Amortized Cost, Due after one year through five years 376  
Held for Investment, Fair Value, Due after one year through five years 381  
Available for Sale, Amortized Cost, Due after one year through five years 441  
Available for Sale, Fair Value, Due after one year through five years 475  
Held for Investment, Amortized Cost, Due after five years through ten years 1,254  
Held for Investment, Fair Value, Due after five years through ten years 1,358  
Available for Sale, Amortized Cost, Due after five years through ten years 406  
Available for Sale, Fair Value, Due after five years through ten years 432  
Held for Investment, Amortized Cost, Due after ten years 5,030  
Held for Investment, Fair Value, Due after ten years 5,644  
Available for Sale, Amortized Cost, Due after ten years 0  
Available for Sale, Fair Value, Due after ten years 0  
Held for Investment, Amortized Cost, Total 6,660  
Held for Investment, Fair Value, Total 7,383  
Available for Sale, Amortized Cost, Total 2,546  
Available for Sale, Fair Value, Total 2,621  
Gross Amortized Cost, Held for Investment Securities 17,122 19,977
Fair value, Held for Investment Securities 17,799 20,487
Gross Amortized Cost, Available for Sale 557,936 639,847
Fair Value, Available for Sale 562,691 648,362
Mortgage-backed securities of U.S Government Sponsored Entities [Member]
   
Amortized cost and fair value of securities by contractual maturity    
Gross Amortized Cost, Held for Investment Securities 0  
Fair value, Held for Investment Securities 0  
Gross Amortized Cost, Available for Sale 175,307 135,665
Fair Value, Available for Sale 178,540 138,447
Collateralized mortgage obligations of U.S. Government Sponsored Entities [Member]
   
Amortized cost and fair value of securities by contractual maturity    
Gross Amortized Cost, Held for Investment Securities 7,393 10,475
Fair value, Held for Investment Securities 7,249 10,339
Gross Amortized Cost, Available for Sale 306,900 428,139
Fair Value, Available for Sale 308,636 436,934
Private collateralized mortgage obligations [Member]
   
Amortized cost and fair value of securities by contractual maturity    
Gross Amortized Cost, Held for Investment Securities 1,569 1,840
Fair value, Held for Investment Securities 1,612 1,880
Gross Amortized Cost, Available for Sale 73,183 73,247
Fair Value, Available for Sale 72,894 70,090
No contractual maturity [Member]
   
Amortized cost and fair value of securities by contractual maturity    
Gross Amortized Cost, Held for Investment Securities 1,500  
Fair value, Held for Investment Securities 1,555  
Gross Amortized Cost, Available for Sale 0  
Fair Value, Available for Sale $ 0