Other Investments Other Investment (Narrative)(Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Investments, All Other Investments [Abstract]
Federal Home Loan Bank Stock	$ 11,000,000	$ 9,590,000
Number of Limited Partnerships	2
Investment in a limited partnership	$ 3,890,000	3,330,000
Investment Tax Credit	927,000	269,000	$ 0
Amortization on Investment in Limited Partnership	$ 680,000	$ 214,000	$ 0