Common Shares and Preferred Shares (Tables)

12 Months Ended

Dec. 31, 2012

Equity [Abstract]

Schedule of Stock by Class [Table Text Block]

Common Shares Outstanding--The table below reconciles the activity of the common shares outstanding:

	December 31,
	2012		2011
Shares outstanding, beginning of year	13,845,635		14,112,256
Shares purchased	(891,704	)	(779,838	)
Shares sold	327,442		351,285
Stock subscription offering, employee cash purchases	76,525		—
Options exercised	368,104		161,932
	(119,633	)	(266,621	)
Shares outstanding, end of year	13,726,002		13,845,635