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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Ceded premiums written	$ (74,629)	$ (62,336)	$ (141,789)	$ (127,323)
Ceded premiums earned	(68,748)	(64,087)	(136,173)	(128,461)
Ceded losses and loss expenses incurred	(26,147)	(20,002)	(50,178)	(68,120)
National Flood Insurance Program [Member]
Ceded premiums written	(55,265)	(44,566)	(103,579)	(90,458)
Ceded premiums earned	(48,907)	(45,495)	(96,855)	(89,980)
Ceded losses and loss expenses incurred	$ (15,339)	$ (8,122)	$ (29,879)	$ (43,076)

X

- Definition

Premiums assumed and earned by another insurer as a result of reinsurance arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 17
-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 113
-Paragraph 16

+ Details

Name:	us-gaap_CededPremiumsEarnedPropertyAndCasualty
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Premiums assumed for property and casualty insurance contracts by another insurer as a result of reinsurance arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 113
-Paragraph 27

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 17
-Article 12

+ Details

Name:	us-gaap_CededPremiumsWrittenPropertyAndCasualty
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The reduction in the amount of the provision for the period for claims and benefits incurred on contract risks ceded to other insurers under reinsurance arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 113
-Paragraph 27, 113

+ Details

Name:	us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration