Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Fair Value of Available for Sale and Held to Maturity securities pledged as collateral	347.6	$ 350.5
Amortized cost of callable debt securities	98.1
Fair value of callable debt securities	95.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Total, Number	12
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	2.0
Individual name issuer trust preferred debt securities
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Total, Number	11	11
Minimum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Callable Debt Securities, Maturity Period	6 months
Callable Debt Securities, Call Feature, Period	1 month
Maximum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Callable Debt Securities, Maturity Period	22 years
Callable Debt Securities, Call Feature, Period	2 years