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Investment Securities: (Tables)
9 Months Ended
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]

 
September 30, 2014
 
December 31, 2013
Federal tax-exempt debt securities
$
14,828

 
$
21,968

Corporate bonds
50,713

 
45,696

Commercial paper
6,297

 

Certificates of deposit
5,665

 
3,205

 
$
77,503

 
$
70,869