Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2014 security	Dec. 31, 2013 security	Mar. 31, 2014 Trust preferred securities: Individual name issuers [Member] security	Dec. 31, 2013 Trust preferred securities: Individual name issuers [Member] security	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Total, Number	17	21	11	11
Fair Value of Available for Sale and Held to Maturity securities pledged as collateral	$ 375.6	$ 397.5
Amortized cost of callable debt securities	88.5
Fair value of callable debt securities	85.1
Callable Debt Securities, Maturity Period					18 months	22 months
Callable Debt Securities, Call Feature, Period					1 month	3 years
Securities in unrealized loss position, number of companies issuing securities	7
Amortized cost of trust preferred securities of individual name issuers that are below investment grade	11.9
Unrealized losses of trust preferred securities of individual name issuers that are below investment grade	$ 2.1