Investment Securities (Narrative) (Details)	3 Months Ended
	Mar. 28, 2015
Schedule of Investments [Line Items]
Contractual maturities of investment securities	3 years
Minimum [Member]
Schedule of Investments [Line Items]
Contractual maturities of investment securities	2 years
Maximum [Member]
Schedule of Investments [Line Items]
Contractual maturities of investment securities	3 years
Contractual maturities of investment securities, balance	1 year