Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Investments [Line Items]
Investment Securities average remaining life			3 years 6 months 22 days
Other than Temporary Impairment Losses, Investments	$ 0		$ 0	$ 0
Available-for-sale Securities, Gross Realized Gains	0.000	$ 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	265,400,000		$ 265,400,000
Available-for-sale securities	$ 360,400,000		$ 360,400,000
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			6 years