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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 121,527 | $ 247,509
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,930) | (15,676)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 87,466 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,475) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 208,993 | 247,509
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (5,405) | (15,676)
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,570 | 11,922
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (16) | (110)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 31,533 | 34,629
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,940) | (4,475)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 35,103 | 46,551
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,956) | (4,585)
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 85,335 | 166,905
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (837) | (3,899)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 301,009 | 258,237
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8,710) | (8,279)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 386,344 | 425,142
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (9,547) | (12,178)
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 796,019 | 1,112,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (8,359) | (16,900)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 5,513 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (202) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 801,532 | 1,112,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (8,561) | (16,900)
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 87,260 | 24,563
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (627) | (537)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 87,260 | 24,563
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (627) | (537)
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 98,156 | 97,256
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9,254) | (9,959)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 98,156 | 97,256
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (9,254) | (9,959)
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,093,711 | 1,563,846
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (11,769) | (37,122)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 523,677 | 390,122
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (23,581) | (22,713)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,617,388 | 1,953,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (35,350) | $ (59,835)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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