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Securities (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Gain on sale of investments	$ 4,000	$ 4,000
Loss on sale of investments	0	0
Unrealized Losses	(8,729,000)		(8,234,000)
Cumulative OTTI charges	14,983,000	15,180,000	14,983,000	15,180,000
Amortized Cost	750,343,000		668,615,000
Securities available for sale	769,949,000		691,000,000
Other-Than-Temporarily Impaired CDO
Contractual balance	27,100,000
Reduced balance	5,400,000
Interest payment received	1,100,000
Cumulative OTTI charges	14,900,000
Other comprehensive income net	5,700,000
Base discount rate, which is subject to an additional margin	3 month LIBOR
Amortized Cost	646,000
Securities available for sale	$ 582,000
Minimum [Member] | Standard Poors [Member]
Credit Quality Indicator Pricing	4.29
Minimum [Member] | Moody Investor Service [Member]
Credit Quality Indicator Pricing	3.15
Minimum [Member] | Other-Than-Temporarily Impaired CDO
Severity of OTTI (as a percent)	28.00%
Maximum [Member] | Standard Poors [Member]
Credit Quality Indicator Pricing	90.15
Maximum [Member] | Moody Investor Service [Member]
Credit Quality Indicator Pricing	92.97
Maximum [Member] | Other-Than-Temporarily Impaired CDO
Severity of OTTI (as a percent)	91.00%

X

- Definition

Represents the contractual balance of debt securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

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X

- Definition

Represents the contractual balance of debt securities categorized neither as held-to-maturity nor trading, reduced by interest payments received, OTTI charges recorded through earnings to date, OTTI charges recorded in other comprehensive income.

+ References

No definition available.

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X

- Definition

Represents the reference rate for the variable rate of discount rate used to calculate present value of expected future cash flows on available-for-sale securities, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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X

- Definition

Rate of credit quality indicator pricing.

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X

- Definition

Net of tax amount of cumulative other than temporary impairment (OTTI) on a debt security, categorized as available-for-sale, recognized in other comprehensive income (loss), attributable to the parent entity.

+ References

No definition available.

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- Definition

Cumulative interest received on loans and other debt instruments.

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- Definition

Represents the gain realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

No definition available.

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- Definition

Represents the loss realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

No definition available.

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- Definition

Represents the percentage of severity of other than temporarily impairment (OTTI) on investment securities.

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No definition available.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-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 Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-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.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-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

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27340-111563



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-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.



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