Investments (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014 security	Jun. 30, 2013	Jun. 30, 2014 security	Jun. 30, 2013	Dec. 31, 2013 security
Investments [Abstract]
Gross gains on investments	$ 42,000	$ 1,600,000	$ 300,000	$ 2,800,000
Gross losses on investments	52,000	43,000	100,000	52,000
Proceeds from sale of investment securities	$ 3,000,000	$ 9,900,000	$ 14,300,000	$ 17,700,000
Number of debt security positions	59		59		84