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Investment Securities: (Tables)
6 Months Ended
Jun. 30, 2013
Investment Securities [Abstract]  
Available-for-sale Securities [Table Text Block]

 
June 30, 2013
 
December 31, 2012
Federal tax-exempt debt securities
$
23,956

 
$
23,732

Corporate bonds
43,727

 
47,037

Sovereign bonds
652

 

Certificates of deposit
5,060

 
8,490

 
$
73,395

 
$
79,259