Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Asset (Liability) Fair Value	$ 1,283	$ 8,496
Interest Rate Lock Commitments [Member]
Asset (Liability) Fair Value	6,921	17
Interest Rate Lock Commitments [Member] \| Positive Fair Values [Member]
Notional Amount	287,898	140,682
Asset, Fair Value	6,947	777
Interest Rate Lock Commitments [Member] \| Negative Fair Values [Member]
Notional Amount	3,154	50,527
Liability, Fair Value	(26)	(760)
Forward Commitments [Member]
Asset (Liability) Fair Value	(5,638)	8,479
Forward Commitments [Member] \| Positive Fair Values [Member]
Notional Amount	5,180	558,861
Asset, Fair Value	5	8,479
Forward Commitments [Member] \| Negative Fair Values [Member]
Notional Amount	297,192	0
Liability, Fair Value	$ (5,643)	$ 0

Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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