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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,500,245 | $ 2,494,059
Gross Unrealized Gains | 39,450 | 28,740
Gross Unrealized Losses | (23,490) | (38,026)
Estimated Fair Value | 2,516,205 | 2,484,773
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 14,228 | 14,677
Gross Unrealized Gains | 4,852 | 6,845
Gross Unrealized Losses | (13) | (8)
Estimated Fair Value | 19,067 | 21,514
U.S. Government-Sponsored Agency Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 25,149 | 25,154
Gross Unrealized Gains | 24 | 35
Gross Unrealized Losses | 0 | (53)
Estimated Fair Value | 25,173 | 25,136
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 307,038 | 256,746
Gross Unrealized Gains | 7,025 | 6,019
Gross Unrealized Losses | (53) | 0
Estimated Fair Value | 314,010 | 262,765
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 95,389 | 100,336
Gross Unrealized Gains | 2,773 | 2,695
Gross Unrealized Losses | (8,276) | (6,076)
Estimated Fair Value | 89,886 | 96,955
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 782,018 | 835,439
Gross Unrealized Gains | 5,322 | 3,042
Gross Unrealized Losses | (5,265) | (16,972)
Estimated Fair Value | 782,075 | 821,509
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,169,552 | 1,154,935
Gross Unrealized Gains | 19,454 | 10,104
Gross Unrealized Losses | (338) | (6,204)
Estimated Fair Value | 1,188,668 | 1,158,835
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 106,871 | 106,772
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (9,545) | (8,713)
Estimated Fair Value | 97,326 | 98,059
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 2,486,017 | 2,479,382
Gross Unrealized Gains | 34,598 | 21,895
Gross Unrealized Losses | (23,477) | (38,018)
Estimated Fair Value | $ 2,497,138 | $ 2,463,259

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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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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