Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 years	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Summary Of Significant Accounting Policies [Line Items]
Investment portfolio percentage rated AA or higher		95.00%
Proceeds from sales, maturities and calls of securities available for sale	$ 14,612	$ 22,960	$ 137,999
Gross realized gains	3	19
Purchase accounting adjustments	112	298
Period of time receiving power, years	32.5
Average effective maturity		3 years
Ecova [Member]
Summary Of Significant Accounting Policies [Line Items]
Owners percentage interest				80.20%
Purchase accounting adjustments	$ 112	$ 298
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	1 year
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	45 years
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