Investment Securities (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Investments [Line Items]
Available-for-sale Securities and Held-to-maturity Securities	0	0	468	0
Other than Temporary Impairment Losses, Investments	$ 0		$ 0	$ 17,000
Asset backed securities mortgage portfolio, term			15 years
Pre-tax gain on sale of securities				20,000
U.S. Treasury And Sponsored Entities Callable Notes [Member]
Schedule of Investments [Line Items]
Available for Sale expected to be called	168,700,000		168,700,000
Available-for-sale securities	$ 551,200,000		$ 551,200,000
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