XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.6.0.2

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 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Estimated Fair Value, Less than 12 Months |  | $ 800,776
Unrealized Losses, Less than 12 Months |  | (6,400)
Estimated Fair Value, 12 Months or Longer |  | 662,705
Unrealized Losses, 12 Months or Longer |  | (31,626)
Estimated Fair Value, Total |  | 1,463,481
Unrealized Losses, Total |  | (38,026)
US Government Agencies Debt Securities [Member] |  |
Estimated Fair Value, Less than 12 Months |  | 9,957
Unrealized Losses, Less than 12 Months |  | (53)
Estimated Fair Value, 12 Months or Longer |  | 0
Unrealized Losses, 12 Months or Longer |  | 0
Estimated Fair Value, Total |  | 9,957
Unrealized Losses, Total |  | (53)
State and municipal securities |  |
Estimated Fair Value, Less than 12 Months | $ 247,509 |
Unrealized Losses, Less than 12 Months | (15,676) |
Estimated Fair Value, 12 Months or Longer | 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Estimated Fair Value, Total | 247,509 |
Unrealized Losses, Total | (15,676) |
Corporate debt securities |  |
Estimated Fair Value, Less than 12 Months | 11,922 | 12,892
Unrealized Losses, Less than 12 Months | (110) | (97)
Estimated Fair Value, 12 Months or Longer | 34,629 | 33,036
Unrealized Losses, 12 Months or Longer | (4,475) | (5,979)
Estimated Fair Value, Total | 46,551 | 45,928
Unrealized Losses, Total | (4,585) | (6,076)
Collateralized mortgage obligations |  |
Estimated Fair Value, Less than 12 Months | 166,905 | 166,007
Unrealized Losses, Less than 12 Months | (3,899) | (1,467)
Estimated Fair Value, 12 Months or Longer | 258,237 | 467,778
Unrealized Losses, 12 Months or Longer | (8,279) | (15,505)
Estimated Fair Value, Total | 425,142 | 633,785
Unrealized Losses, Total | (12,178) | (16,972)
Mortgage-backed securities |  |
Estimated Fair Value, Less than 12 Months | 1,137,510 | 611,920
Unrealized Losses, Less than 12 Months | (17,437) | (4,783)
Estimated Fair Value, 12 Months or Longer | 0 | 63,818
Unrealized Losses, 12 Months or Longer | 0 | (1,421)
Estimated Fair Value, Total | 1,137,510 | 675,738
Unrealized Losses, Total | (17,437) | (6,204)
Auction rate securities |  |
Estimated Fair Value, Less than 12 Months | 0 | 0
Unrealized Losses, Less than 12 Months | 0 | 0
Estimated Fair Value, 12 Months or Longer | 97,256 | 98,059
Unrealized Losses, 12 Months or Longer | (9,959) | (8,713)
Estimated Fair Value, Total | 97,256 | 98,059
Unrealized Losses, Total | (9,959) | (8,713)
Debt securities |  |
Estimated Fair Value, Less than 12 Months | 1,563,846 | 800,776
Unrealized Losses, Less than 12 Months | (37,122) | (6,400)
Estimated Fair Value, 12 Months or Longer | 390,122 | 662,691
Unrealized Losses, 12 Months or Longer | (22,713) | (31,618)
Estimated Fair Value, Total | 1,953,968 | 1,463,467
Unrealized Losses, Total | $ (59,835) | (38,018)
Equity securities |  |
Estimated Fair Value, Less than 12 Months |  | 0
Unrealized Losses, Less than 12 Months |  | 0
Estimated Fair Value, 12 Months or Longer |  | 14
Unrealized Losses, 12 Months or Longer |  | (8)
Estimated Fair Value, Total |  | 14
Unrealized Losses, Total |  | $ (8)

X
- 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
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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 Reference 2: 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 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 less than twelve months. + 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
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized 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)(1) -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
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_AuctionRateSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |