Securities (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($) security
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	$ 350.6	$ 350.5
Amortized cost of callable debt securities	125.5
Fair value of callable debt securities	$ 122.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Total, Number | security	19
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	$ 1.6
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 | security	10	11
Minimum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Callable Debt Securities, Maturity Period	4 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