Commitments and Contingent Liabilities (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
	Sep. 30, 2013 Commitments to extend credit and standby letters of credit	Dec. 31, 2012 Commitments to extend credit and standby letters of credit	Sep. 30, 2013 Standby letters of credit	Dec. 31, 2012 Standby letters of credit	Sep. 30, 2013 Standby letters of credit Minimum	Sep. 30, 2013 Standby letters of credit Maximum
Commitments and contingent liabilities
The amount of commitments made by the entity	$ 452,100	$ 401,100	$ 14,800	$ 14,800
Term of the guarantee agreements					1 year	2 years