Investment Securities (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013
Schedule of Investments [Line Items]
Available-for-sale Securities and Held-to-maturity Securities		468
Other than Temporary Impairment Losses, Investments	$ 0	$ 0	$ 0
Asset backed securities mortgage portfolio, term		15 years
Pre-tax gain on sale of securities		20,000	0
U.S. Treasury And Sponsored Entities Callable Notes [Member]
Schedule of Investments [Line Items]
Available for Sale expected to be called	167,800,000	167,800,000
Available-for-sale securities	$ 551,900,000	$ 551,900,000
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term		8 years
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term		13 years