Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 years	Dec. 31, 2012	Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Investment portfolio percentage rated AA or higher	95.00%	97.00%
Proceeds from sales, maturities and calls of securities available for sale	$ 22,960	$ 137,999	$ 80
Gross realized gains	19	461
Purchase accounting adjustments	298	3,430
Period of time receiving power, years	32.5
Average effective maturity	3 years	1 year 10 months 24 days
Ecova [Member]
Summary Of Significant Accounting Policies [Line Items]
Owners percentage interest	80.20%
Purchase accounting adjustments	$ 298	$ 3,430
Customer Relationships [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period	2 years
Customer Relationships [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period	12 years
Software and Software Development Costs [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period	3 years
Software and Software Development Costs [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period	7 years
Other Intangible Assets [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period	1 year
Other Intangible Assets [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period	10 years