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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,494,087 | $ 2,494,059
Gross Unrealized Gains | 53,050 | 28,740
Gross Unrealized Losses | (17,413) | (38,026)
Estimated Fair Value | 2,529,724 | 2,484,773
U.S. Government-Sponsored Agency Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 143 | 25,154
Gross Unrealized Gains | 3 | 35
Gross Unrealized Losses | 0 | (53)
Estimated Fair Value | 146 | 25,136
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 333,246 | 256,746
Gross Unrealized Gains | 12,101 | 6,019
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 345,347 | 262,765
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 95,419 | 100,336
Gross Unrealized Gains | 3,001 | 2,695
Gross Unrealized Losses | (6,873) | (6,076)
Estimated Fair Value | 91,547 | 96,955
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 701,853 | 835,439
Gross Unrealized Gains | 5,951 | 3,042
Gross Unrealized Losses | (1,458) | (16,972)
Estimated Fair Value | 706,346 | 821,509
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,242,267 | 1,154,935
Gross Unrealized Gains | 25,501 | 10,104
Gross Unrealized Losses | (5) | (6,204)
Estimated Fair Value | 1,267,763 | 1,158,835
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 106,949 | 106,772
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (9,063) | (8,713)
Estimated Fair Value | 97,886 | 98,059
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,479,877 | 2,479,382
Gross Unrealized Gains | 46,557 | 21,895
Gross Unrealized Losses | (17,399) | (38,018)
Estimated Fair Value | 2,509,035 | 2,463,259
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 14,210 | 14,677
Gross Unrealized Gains | 6,493 | 6,845
Gross Unrealized Losses | (14) | (8)
Estimated Fair Value | $ 20,689 | $ 21,514

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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=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 + Details
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