Investment Securities (Textual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]
Trust preferred investment securities held to maturity	$ 10.5
Trust preferred investment security of non public bank company	10.0
Interest in trust preferred investment security	100.00%
Remaining trust preferred investment security of non public bank company	0.5
Interest in another trust preferred investment security	10.00%
Carrying value of trust preferred investment security one	10.0
Carrying value of trust preferred investment security two	0.5
Yield on trust preferred investment security one	55.00%
Yield on trust preferred investment security two	45.00%
Fair value of trust preferred investment security one	5.5
Fair value of trust preferred investment security two	0.2
Unrealized loss on trust preferred investment securities	4.8
Combined unrealized loss	4.8
Unrealized loss on trust preferred securities.	4.8
Securities pledged as collateral	$ 501	$ 537