Investments Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Amounts maturing:
One year or less, Amortized Cost	$ 30,566	$ 6,000
After one through five years, Amortized Cost	5,144	7,021
After five through ten years, Amortized Cost	109	168
After ten years, Amortized Cost	97	153
Amortized Cost	35,916	13,342
One year or less, Estimated Fair value	30,567	6,000
After one through five years, Estimated Fair value	5,163	7,036
After five through ten years, Estimated Fair value	117	177
After ten years, Estimated Fair value	105	163
Estimated Fair Value	$ 35,952	$ 13,376