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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 | Sep. 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 | $ 226,700
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,160)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 397,554
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (17,091)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 624,254
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (18,251)
State and Municipal Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 91,790
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (735)
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 | 91,790
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (735)
Corporate Debt Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 4,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (35)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 33,766
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,315)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 37,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (5,350)
Collateralized Mortgage Obligations [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 124,739
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (376)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 266,062
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,395)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 390,801
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,771)
Mortgage-Backed Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 6,171
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 | 6,171
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (14)
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 | 97,726
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9,381)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 97,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (9,381)
Debt Securities [Member] |
Schedule of Investments [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 226,700
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,160)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 397,554
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (17,091)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 624,254
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (18,251)
Equity 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 | 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 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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