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Fair Value (Fair Value By Level) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets:
Available for sale securities	$ 4,427,570	$ 4,199,372
Assets/liabilities measured at fair value
Assets:
Available for sale securities	4,427,570	4,199,372
Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale securities	4,136,473	3,893,211
Assets/liabilities measured at fair value | Obligations of states and political subdivisions
Assets:
Available for sale securities	262,251	277,704
Assets/liabilities measured at fair value | Equity securities
Assets:
Available for sale securities	28,846	28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value
Assets:
Available for sale securities	4,427,570	4,199,372
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale securities	4,136,473	3,893,211
Measured on a recurring basis: | Assets/liabilities measured at fair value | Obligations of states and political subdivisions
Assets:
Available for sale securities	262,251	277,704
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities
Assets:
Available for sale securities	28,846	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	28,846	28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets:
Available for sale securities	28,846	28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2)
Assets:
Available for sale securities	4,380,214	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	4,117,963	3,871,981
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets:
Available for sale securities	262,251	277,705
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Unobservable Inputs (Level 3)
Assets:
Available for sale securities	18,510	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	$ 18,510	$ 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=65884222&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=73527792&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=66010992&loc=d3e26610-111562

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