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Fair Value (Fair Value By Level) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets:
Available for sale securities	$ 4,233,319	$ 4,199,372
Assets/liabilities measured at fair value
Assets:
Available for sale securities	4,233,319	4,199,372
Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale securities	3,925,794	3,893,211
Assets/liabilities measured at fair value | States and political subdivisions
Assets:
Available for sale securities	278,596	277,704
Assets/liabilities measured at fair value | Other
Assets:
Available for sale securities	28,929	28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value
Assets:
Available for sale securities	4,233,319	4,199,372
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale securities	3,925,794	3,893,211
Measured on a recurring basis: | Assets/liabilities measured at fair value | States and political subdivisions
Assets:
Available for sale securities	278,596	277,704
Measured on a recurring basis: | Assets/liabilities measured at fair value | Other
Assets:
Available for sale securities	28,929	28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available for sale securities	28,929	28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Assets:
Available for sale securities	28,929	28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2)
Assets:
Available for sale securities	4,185,017	4,149,686
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets:
Available for sale securities	3,906,421	3,871,982
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Assets:
Available for sale securities	278,596	277,704
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Unobservable Inputs (Level 3)
Assets:
Available for sale securities	19,373	21,229
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Assets:
Available for sale securities	$ 19,373	$ 21,229

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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=51813488&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=49167202&loc=d3e26610-111562

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