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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Investment Securities | Investment securities at September 30, 2016, were as follows:
Securities Available-for-Sale (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Estimated Fair Value
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 270,000 |  |  | $ | — |  |  | $ | 855 |  |  | $ | 269,145 |
U.S. Government sponsored entities' asset-backed securities |  | 932,869 |  |  | 20,157 |  |  | 129 |  |  | 952,897 |
Other equity securities |  | 1,119 |  |  | 1,688 |  |  | — |  |  | 2,807 |
Total |  | $ | 1,203,988 |  |  | $ | 21,845 |  |  | $ | 984 |  |  | $ | 1,224,849 |
Securities Held-to-Maturity (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Estimated Fair Value
U.S. Government sponsored entities' asset-backed securities |  | $ | 81,812 |  |  | $ | 1,885 |  |  | $ | 19 |  |  | $ | 83,678 |
Obligations of states and political subdivisions |  | 113,283 |  |  | 3,777 |  |  | $ | 200 |  |  | 116,860 |
Total |  | $ | 195,095 |  |  | $ | 5,662 |  |  | $ | 219 |  |  | $ | 200,538 |
Investment securities at December 31, 2015, were as follows:
Securities Available-for-Sale (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Estimated Fair Value
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 527,605 |  |  | $ | — |  |  | $ | 5,542 |  |  | $ | 522,063 |
U.S. Government sponsored entities' asset-backed securities |  | 907,989 |  |  | 8,776 |  |  | 5,272 |  |  | 911,493 |
Other equity securities |  | 1,120 |  |  | 1,590 |  |  | — |  |  | 2,710 |
Total |  | $ | 1,436,714 |  |  | $ | 10,366 |  |  | $ | 10,814 |  |  | $ | 1,436,266 |
Securities Held-to-Maturity (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Estimated Fair Value
Obligations of states and political subdivision |  | $ | 48,190 |  |  | $ | 734 |  |  | $ | — |  |  | $ | 48,924 |
U.S. Government sponsored entities' asset-backed securities |  | 101,112 |  |  | 1,526 |  |  | 134 |  |  | 102,504 |
Total |  | $ | 149,302 |  |  | $ | 2,260 |  |  | $ | 134 |  |  | $ | 151,428 |
Schedule Of Unrealized Loss On Securities | Securities with unrealized losses at September 30, 2016, were as follows:
|  | Unrealized loss position for less than 12 months |  | Unrealized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 269,145 |  |  | $ | 855 |  |  | $ | — |  |  | $ | — |  |  | $ | 269,145 |  |  | $ | 855 |
U.S. Government sponsored entities' asset-backed securities |  | 48,885 |  |  | 64 |  |  | $ | 28,993 |  |  | 65 |  |  | $ | 77,878 |  |  | 129 |
Total |  | $ | 318,030 |  |  | $ | 919 |  |  | $ | 28,993 |  |  | $ | 65 |  |  | $ | 347,023 |  |  | $ | 984 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | — |  |  | $ | — |  |  | $ | 7,700 |  |  | $ | 19 |  |  | $ | 7,700 |  |  | $ | 19 |
Obligations of states and political subdivisions |  | 13,259 |  |  | $ | 200 |  |  | — |  |  | — |  |  | $ | 13,259 |  |  | 200 |
Total |  | $ | 13,259 |  |  | $ | 200 |  |  | $ | 7,700 |  |  | $ | 19 |  |  | $ | 20,959 |  |  | $ | 219 |
Securities with unrealized losses at December 31, 2015, were as follows:
|  | Unrealized loss position for less than 12 months |  | Unrealized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 326,973 |  |  | $ | 2,117 |  |  | $ | 195,090 |  |  | $ | 3,425 |  |  | $ | 522,063 |  |  | $ | 5,542 |
U.S. Government sponsored entities' asset-backed securities |  | 384,169 |  |  | 2,776 |  |  | 114,543 |  |  | 2,496 |  |  | 498,712 |  |  | 5,272 |
Total |  | $ | 711,142 |  |  | $ | 4,893 |  |  | $ | 309,633 |  |  | $ | 5,921 |  |  | $ | 1,020,775 |  |  | $ | 10,814 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 5,656 |  |  | $ | 10 |  |  | $ | 7,792 |  |  | $ | 124 |  |  | $ | 13,448 |  |  | $ | 134 |
Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity | The amortized cost and estimated fair value of investments in debt securities at September 30, 2016, are shown in the following table by contractual maturity, except for asset-backed securities, which are shown as a single total, due to the unpredictability of the timing of principal repayments.
Securities Available-for-Sale (In thousands) |  | Amortized cost |  | Fair value |  | Tax equivalent yield
Obligations of U.S. Treasury and other U.S. Government sponsored entities' obligations: |  |  |  |  |  |  |  |
Due one through five years |  | $ | 270,000 |  |  | 269,145 |  |  | 1.18 | %
Total |  | $ | 270,000 |  |  | $ | 269,145 |  |  | 1.18 | %
U.S. Government sponsored entities' asset-backed securities: |  | $ | 932,869 |  |  | $ | 952,897 |  |  | 2.13 | %
Securities Held-to-Maturity (In thousands) |  | Amortized cost |  | Fair value |  | Tax equivalent yield
Obligations of state and political subdivisions: |  |  |  |  |  |
Due over ten years |  | $ | 113,283 |  |  | $ | 116,860 |  |  | 4.35 | %
Total |  | $ | 113,283 |  |  | $ | 116,860 |  |  | 4.35 | %
U.S. Government sponsored entities' asset-backed securities |  | $ | 81,812 |  |  | $ | 83,678 |  |  | 3.31 | %

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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