Investment Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Number of Investment Securities Sold	39	54
Available-for-sale Securities Pledged as Collateral	$ 215.9	$ 224.7
Description of Holding Securities	there were no holdings of securities of any one issuer, other than the U.S Government and its agencies, in an amount greater than 10% of stockholders’ equity.