Derivatives and Hedging Activities (Details Textuals) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Derivative and Hedging Activities (Textuals) [Abstract]
Term Of Written Loan Commitments	60 days before the closing of the loan
Outstanding TBA securities	$ 0	$ 0	$ 0
Default Assumptions Percentage	100.00%
Maximum value of the guaranteed derivative instruments	2,900,000
Collateral Posted against derivative liabilities	$ 91,200,000	$ 85,200,000	$ 95,800,000
Period of credit risk derivatives	one to 8.00 years

Maximum amount the entity would be obligated to pay on the credit risk derivatives upon occurrence of a credit event.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A, 15B, 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708775-113959

Name:	us-gaap_MaximumPotentialFutureExposureOnCreditRiskDerivatives
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant