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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Investment Securities | Investment securities at September 30, 2018, were as follows:
Debt Securities Available-for-Sale (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Estimated Fair Value
U.S. Government sponsored entities' asset-backed securities |  | $ | 1,074,605 |  |  | $ | 229 |  |  | $ | 42,569 |  |  | $ | 1,032,265 |
Total |  | $ | 1,074,605 |  |  | $ | 229 |  |  | $ | 42,569 |  |  | $ | 1,032,265 |
Debt Securities Held-to-Maturity (In thousands) |  | Amortized Cost |  | Gross Unrecognized Holding Gains |  | Gross Unrecognized Holding Losses |  | Estimated Fair Value
U.S. Government sponsored entities' asset-backed securities |  | $ | 46,974 |  |  | $ | 41 |  |  | $ | 1,386 |  |  | $ | 45,629 |
Obligations of states and political subdivisions |  | 303,668 |  |  | 1,096 |  |  | $ | 6,052 |  |  | 298,712 |
Total |  | $ | 350,642 |  |  | $ | 1,137 |  |  | $ | 7,438 |  |  | $ | 344,341 |
Investment securities at December 31, 2017, were as follows:
Debt 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 |  | $ | 245,000 |  |  | $ | — |  |  | $ | 2,280 |  |  | $ | 242,720 |
U.S. Government sponsored entities' asset-backed securities |  | 852,645 |  |  | 4,645 |  |  | 8,129 |  |  | 849,161 |
Total |  | $ | 1,097,645 |  |  | $ | 4,645 |  |  | $ | 10,409 |  |  | $ | 1,091,881 |
Debt Securities Held-to-Maturity (In thousands) |  | Amortized Cost |  | Gross Unrecognized Holding Gains |  | Gross Unrecognized Holding Losses |  | Estimated Fair Value
Obligations of states and political subdivisions |  | $ | 300,412 |  |  | $ | 6,575 |  |  | $ | 713 |  |  | $ | 306,274 |
U.S. Government sponsored entities' asset-backed securities |  | 56,785 |  |  | 758 |  |  | 38 |  |  | 57,505 |
Total |  | $ | 357,197 |  |  | $ | 7,333 |  |  | $ | 751 |  |  | $ | 363,779 |
Schedule Of Unrealized Loss On Securities | Investment securities with unrealized/unrecognized losses at September 30, 2018, were as follows:
|  | Unrealized/unrecognized loss position for less than 12 months |  | Unrealized/unrecognized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 547,752 |  |  | $ | 12,583 |  |  | $ | 450,284 |  |  | $ | 29,986 |  |  | $ | 998,036 |  |  | $ | 42,569 |
Total |  | $ | 547,752 |  |  | $ | 12,583 |  |  | $ | 450,284 |  |  | $ | 29,986 |  |  | $ | 998,036 |  |  | $ | 42,569 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 32,704 |  |  | $ | 1,165 |  |  | $ | 6,944 |  |  | $ | 221 |  |  | $ | 39,648 |  |  | $ | 1,386 |
Obligations of states and political subdivisions |  | 152,074 |  |  | $ | 3,041 |  |  | 69,429 |  |  | 3,011 |  |  | $ | 221,503 |  |  | 6,052 |
Total |  | $ | 184,778 |  |  | $ | 4,206 |  |  | $ | 76,373 |  |  | $ | 3,232 |  |  | $ | 261,151 |  |  | $ | 7,438 |
Investment securities with unrealized/unrecognized losses at December 31, 2017, were as follows:
|  | Unrealized/unrecognized loss position for less than 12 months |  | Unrealized/unrecognized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 24,931 |  |  | $ | 70 |  |  | $ | 217,789 |  |  | $ | 2,210 |  |  | $ | 242,720 |  |  | $ | 2,280 |
U.S. Government sponsored entities' asset-backed securities |  | 236,924 |  |  | 2,786 |  |  | 318,797 |  |  | 5,343 |  |  | 555,721 |  |  | 8,129 |
Total |  | $ | 261,855 |  |  | $ | 2,856 |  |  | $ | 536,586 |  |  | $ | 7,553 |  |  | $ | 798,441 |  |  | $ | 10,409 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 26,644 |  |  | $ | 194 |  |  | $ | 45,498 |  |  | $ | 519 |  |  | $ | 72,142 |  |  | $ | 713 |
U.S. Government sponsored entities' asset-backed securities |  | 7,331 |  |  | 38 |  |  | — |  |  | — |  |  | 7,331 |  |  | 38 |
Total |  | $ | 33,975 |  |  | $ | 232 |  |  | $ | 45,498 |  |  | $ | 519 |  |  | $ | 79,473 |  |  | $ | 751 |
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, 2018, 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
U.S. Government sponsored entities' asset-backed securities |  | $ | 1,074,605 |  |  | $ | 1,032,265 |  |  | 2.35 | %
Securities Held-to-Maturity (In thousands) |  | Amortized cost |  | Fair value |  | Tax equivalent yield (1)
Obligations of state and political subdivisions: |  |  |  |  |  |
Due five through ten years |  | $ | 2,430 |  |  | $ | 2,385 |  |  | 2.97 | %
Due over ten years |  | 301,238 |  |  | 296,327 |  |  | 3.68 | %
Total (1) |  | $ | 303,668 |  |  | $ | 298,712 |  |  | 3.67 | %
U.S. Government sponsored entities' asset-backed securities |  | $ | 46,974 |  |  | $ | 45,629 |  |  | 2.83 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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