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Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available for sale    
Amortized cost within one year $ 4,102 $ 4,358
Fair value within one year 4,116 4,368
Amortized cost one to five years 53,522 49,415
Fair value for one to five years 54,656 50,673
Amortized cost for five to ten years 91,240 98,551
Fair value for five to ten years 96,738 104,258
Amortized cost for after ten years 57,966 61,313
Fair value for after ten years 61,245 65,436
Total amortized cost 206,830 213,637
Total fair value 216,755 224,735
Total available for sale investment securities, Amortized Cost 462,552 463,306
Total available for sale securities, Fair Value 479,976 482,801
Held to maturity    
Within one year, amortized cost 2,110   
Within one year, fair value 2,110   
One to five years, amortized cost      
One to five years, fair value      
Total held to maturity investment securities, amortized cost 2,110   
Total held to maturity investment securities, fair value 2,110   
Federal agency collateralized mortgage obligations [Member]
   
Available for sale    
Total available for sale investment securities, Amortized Cost 109,727 95,337
Total available for sale securities, Fair Value 111,235 96,831
Federal agency mortgage-backed pools [Member]
   
Available for sale    
Total available for sale investment securities, Amortized Cost 144,300 152,372
Total available for sale securities, Fair Value 150,230 159,204
Private labeled mortgage-backed pools [Member]
   
Available for sale    
Total available for sale investment securities, Amortized Cost 1,695 1,960
Total available for sale securities, Fair Value $ 1,756 $ 2,031