Disclosures About Fair Value of Assets and Liabilities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012
Hedged loans [Member]
Reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs
Beginning balance	$ 49,618	$ 48,411	$ 50,088	$ 54,362
Included in net income	393	351	(410)	(74)
Purchases, issuances, and settlements	1,797	1,200	(352)	6,114
Principal payments	(628)	(344)	(915)	(491)
Transfers out to Level 2				(59,911)
Ending balance	51,180	49,618	48,411
Forward sale commitments [Member]
Reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs
Beginning balance	455	281	407	662
Included in net income	294	174	(126)	(152)
Transfers out to Level 2				(510)
Ending balance	749	455	281
Interest Rate Swap [Member]
Reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs
Beginning balance	(3,846)	(2,554)	(3,415)	(7,101)
Included in net income	(393)	(351)	410	74
Included in other comprehensive income, gross	(3,001)	(941)	451	563
Transfers out to Level 2				6,464
Ending balance	(7,240)	(3,846)	(2,554)
Commitment to originate loan [Member]
Reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs
Beginning balance	(64)	(56)
Included in net income	64	(8)	(56)	(71)
Transfers out to Level 2				71
Ending balance		$ (64)	$ (56)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Principal.

No definition available.

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- Definition

Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(3)

-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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-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.

+ Details

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Balance Type:	debit
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