Securities (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Securities	Dec. 31, 2011 Securities	Dec. 31, 2010
Securities (Textual) [Abstract]
Number of securities holdings	0	0
Shareholders' equity percentage	10.00%	10.00%
Securities	$ 264,813	$ 264,166
Tax provision related to net realized gains	483	215	581
Proceeds from sale of securities for which fair value was elected	3,386	343	34
Net gain (losses) from proceeds of sale of securities at fair value	$ 298	$ 30	$ (68)