Investment and Mortgage-Backed Securities, Held to Maturity (Schedule of investment and mortgage-backed securities held to maturity) (Details) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Transferred Security, at Carrying Value	$ 72,000,000
Available-for-sale Securities, Gross Realized Losses	$ 224,000	$ 0

For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563

Name:	us-gaap_HeldToMaturitySecuritiesTransferredSecurityAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant