Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule of Investments [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Tax Equivalent Interest Adjustment	$ 786,000
Investment Securities average remaining life	4 years 5 months 5 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
Available-for-sale Securities Pledged as Collateral	$ 1,062,000,000		$ 937,000,000
U.S. Treasury And Sponsored Entities Callable Notes [Member]
Schedule of Investments [Line Items]
Available for Sale expected to be called	0
Available-for-sale securities	$ 268,400,000
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term	7 months
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term	3 years