Consolidated Statements of Income and Comprehensive Income [Parenthetical]	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Company's stock offering and concurrent second-step conversion ratio	0.9978	0.9978
Company's stock offering and conversion effective date	Jun. 29, 2011	Jun. 29, 2011

This item represents the conversion ratio used in the calculation of a stock split.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Stock Split

-URI http://asc.fasb.org/extlink&oid=6525746

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration