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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets:
Estimated fair value, Available for sale securities	$ 4,673,472	$ 4,911,963
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value
Assets:
Estimated fair value, Available for sale securities	4,673,472	4,911,963
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities
Assets:
Estimated fair value, Available for sale securities	4,365,066	4,600,372
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | States and political subdivisions
Assets:
Estimated fair value, Available for sale securities	279,296	282,276
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Other
Assets:
Estimated fair value, Available for sale securities	29,110	29,315
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Estimated fair value, Available for sale securities	29,110	29,315
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Assets:
Estimated fair value, Available for sale securities	29,110	29,315
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2)
Assets:
Estimated fair value, Available for sale securities	4,621,666	4,858,585
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets:
Estimated fair value, Available for sale securities	4,342,370	4,576,309
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Assets:
Estimated fair value, Available for sale securities	279,296	282,276
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3)
Assets:
Estimated fair value, Available for sale securities	22,696	24,063
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Assets:
Estimated fair value, Available for sale securities	$ 22,696	$ 24,063

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

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



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