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Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summarizes amortized cost and estimated fair values of securities available for sale
Amortized Cost	$ 536,409	$ 577,931
Gross Unrealized Gains	9,916	14,718
Gross Unrealized Losses	(199)	(149)
Estimated Fair Value	546,126	592,500
U.S. Federal agencies [Member]
Summarizes amortized cost and estimated fair values of securities available for sale
Amortized Cost	452,554	481,486
Gross Unrealized Gains	3,654	6,673
Gross Unrealized Losses	(164)	(116)
Estimated Fair Value	456,044	488,043
Mortgage backed securities [Member]
Summarizes amortized cost and estimated fair values of securities available for sale
Amortized Cost	19,100	28,984
Gross Unrealized Gains	825	615
Gross Unrealized Losses	(1)	(13)
Estimated Fair Value	19,924	29,586
States and political subdivisions [Member]
Summarizes amortized cost and estimated fair values of securities available for sale
Amortized Cost	53,912	60,239
Gross Unrealized Gains	2,875	2,490
Gross Unrealized Losses	(20)	(20)
Estimated Fair Value	56,767	62,709
Other securities [Member]
Summarizes amortized cost and estimated fair values of securities available for sale
Amortized Cost	10,843	7,222
Gross Unrealized Gains	2,562	4,940
Gross Unrealized Losses	(14)
Estimated Fair Value	$ 13,391	$ 12,162

X

- Definition

Available for sale securities fair value.

+ References

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



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

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-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 Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 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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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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