Investments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 security	Mar. 31, 2014	Dec. 31, 2014 security
Investments [Abstract]
Gross gains on investments	$ 900,000	$ 200,000
Gross losses on investments	28,000	28,000
Proceeds from sale of investment securities	$ 1,600,000	$ 11,300,000
Number of debt security positions	18		24