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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) $ in Thousands | Jun. 30, 2016 USD ($)
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Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 22,376
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (31)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 434,595
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (17,382)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 456,971
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (17,413)
Corporate Debt Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 32,186
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (6,873)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 32,186
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (6,873)
Collateralized Mortgage Obligations [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 21,695
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (17)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 292,954
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,441)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 314,649
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,458)
Mortgage-Backed Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 11,569
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 11,569
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (5)
Auction Rate Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 97,886
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9,063)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 97,886
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (9,063)
Debt Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 21,695
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (17)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 434,595
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (17,382)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 456,290
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (17,399)
Equity Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 681
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (14)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 681
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (14)

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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=27724398&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=27724398&loc=d3e27337-111563 + Details
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