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Derivatives (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  |  |  |  |
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Sep. 30, 2011 investments reportablesegment interestrateswaps | Sep. 30, 2010 | Sep. 30, 2011 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2006-2011 [Member] | Dec. 31, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2006-2011 [Member] | Sep. 30, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2006-2011 [Member] | Sep. 30, 2011 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2011-2016 [Member] | Dec. 31, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2011-2016 [Member] | Sep. 30, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2011-2016 [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of interest rate swaps | 1 |  |  |  |  |  |  |
Notional amount of interest rate derivatives |  |  | $ 115,000 | $ 115,000 | $ 115,000 | $ 115,000 | $ 115,000 | $ 115,000
Fixed rate payments, interest rate |  |  | 7.125% |  |  | 5.50% |  |
Fair value of collateral pledged to secure interest rate contracts | 14,665 |  |  |  |  |  |  |
Incremental interest expense paid to interest rate swap counterparties | $ 3,961 | $ 4,374 |  |  |  |  |  |

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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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