Commitments and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2014 Commitments to extend credit and standby letters of credit	Dec. 31, 2013 Commitments to extend credit and standby letters of credit	Mar. 31, 2014 Standby letters of credit	Dec. 31, 2013 Standby letters of credit	Mar. 31, 2014 Standby letters of credit Minimum	Mar. 31, 2014 Standby letters of credit Maximum
Commitments and contingent liabilities
The amount of commitments made by the entity	$ 459.2	$ 469.5	$ 13.8	$ 15.2
Term of the guarantee agreements					1 year	2 years