Derivative and Hedging Activities (Details Textuals) (USD $)			3 Months Ended
Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Capital Market Fees [Member] Interest Rate Related Instruments Customer and Mirror [Member]	Mar. 31, 2012 Capital Market Fees [Member] Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on free standing derivatives			$ 381,000	$ 755,000
Derivative and Hedging Activities (Textuals) [Abstract]
Investment securities and cash equivalents pledged as collateral	61,000,000	70,000,000
Covered call options outstanding	$ 0	$ 0

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44D

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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