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

 
June 30, 2014
 
December 31, 2013
Federal tax-exempt debt securities
$
18,524

 
$
21,968

Corporate bonds
51,584

 
45,696

Commercial paper
4,228

 

Certificates of deposit
5,560

 
3,205

 
$
79,896

 
$
70,869