Investment and Mortgage-Backed Securities, Held to Maturity (Schedule of investment and mortgage-backed securities held to maturity) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Transferred Security, at Carrying Value	$ 72,000,000		$ 72,000,000
Available-for-sale Securities, Gross Realized Gains	319,000	520,000	795,000	1,300,000
Available-for-sale Securities, Gross Realized Losses	$ 176,000	$ 101,000	$ 607,000	$ 101,000