Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Investments [Line Items]
Investment Securities average remaining life	3 years 11 months 2 days
Other than Temporary Impairment Losses, Investments	$ 0	$ 0
Available-for-sale Securities, Gross Realized Gains	$ 0.000	$ 0.000
Asset backed securities mortgage portfolio, term	15 years
U.S. Treasury And Sponsored Entities Callable Notes [Member]
Schedule of Investments [Line Items]
Available for Sale expected to be called	$ 150,000,000
Available-for-sale securities	$ 421,900,000
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term	1 year
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term	7 years