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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Available for sale securities	$ 5,225,043	$ 5,304,579
Fair Value Measurements Recurring [Member] | Estimate Of Fair Value Fair Value Disclosure [Member]
Assets:
Available for sale securities	5,225,043	5,304,579
Fair Value Measurements Recurring [Member] | Estimate Of Fair Value Fair Value Disclosure [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale securities	4,927,862	5,027,701
Fair Value Measurements Recurring [Member] | Estimate Of Fair Value Fair Value Disclosure [Member] | U S States And Political Subdivisions [Member]
Assets:
Available for sale securities	268,095	248,410
Fair Value Measurements Recurring [Member] | Estimate Of Fair Value Fair Value Disclosure [Member] | Equity Securities [Member]
Assets:
Available for sale securities	29,086	28,468
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level1 [Member]
Assets:
Available for sale securities	29,086	28,468
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level1 [Member] | Equity Securities [Member]
Assets:
Available for sale securities	29,086	28,468
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level2 [Member]
Assets:
Available for sale securities	5,169,961	5,248,259
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level2 [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale securities	4,901,866	4,999,849
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level2 [Member] | U S States And Political Subdivisions [Member]
Assets:
Available for sale securities	268,095	248,410
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level3 [Member]
Assets:
Available for sale securities	25,996	27,852
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level3 [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale securities	$ 25,996	$ 27,852

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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