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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Investment Securities | Investment securities at December 31, 2014, 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 |  | $ | 546,886 |  |  | $ | 11 |  |  | $ | 8,833 |  |  | $ | 538,064 |
U.S. Government sponsored entities' asset-backed securities |  | 751,974 |  |  | 13,421 |  |  | 4,242 |  |  | 761,153 |
Other equity securities |  | 1,120 |  |  | 1,578 |  |  | — |  |  | 2,698 |
Total |  | $ | 1,299,980 |  |  | $ | 15,010 |  |  | $ | 13,075 |  |  | $ | 1,301,915 |
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 |  | $ | 140,562 |  |  | $ | 3,088 |  |  | $ | 160 |  |  | $ | 143,490 |
Investment securities at June 30, 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 |  | $ | 596,887 |  |  | $ | — |  |  | $ | 7,968 |  |  | $ | 588,919 |
U.S. Government sponsored entities' asset-backed securities |  | 770,895 |  |  | 11,419 |  |  | 3,675 |  |  | 778,639 |
Other equity securities |  | 1,120 |  |  | 1,587 |  |  | — |  |  | 2,707 |
Total |  | $ | 1,368,902 |  |  | $ | 13,006 |  |  | $ | 11,643 |  |  | $ | 1,370,265 |
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 |  | $ | 121,527 |  |  | $ | 2,152 |  |  | $ | 133 |  |  | $ | 123,546 |
Schedule Of Unrealized Loss On Securities | Securities with unrealized losses at June 30, 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 agencies |  | $ | 376,247 |  |  | $ | 3,753 |  |  | $ | 212,672 |  |  | $ | 4,215 |  |  | $ | 588,919 |  |  | $ | 7,968 |
U.S. Government agencies' asset-backed securities |  | $ | 193,222 |  |  | $ | 849 |  |  | $ | 126,347 |  |  | $ | 2,826 |  |  | $ | 319,569 |  |  | $ | 3,675 |
Total |  | $ | 569,469 |  |  | $ | 4,602 |  |  | $ | 339,019 |  |  | $ | 7,041 |  |  | $ | 908,488 |  |  | $ | 11,643 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 18,841 |  |  | $ | 20 |  |  | $ | 7,931 |  |  | $ | 113 |  |  | $ | 26,772 |  |  | $ | 133 |
Securities with unrealized losses at December 31, 2014, 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 |  | $ | 119,913 |  |  | $ | 87 |  |  | $ | 388,140 |  |  | $ | 8,746 |  |  | $ | 508,053 |  |  | $ | 8,833 |
U.S. Government sponsored entities' asset-backed securities |  | 73,276 |  |  | 136 |  |  | 170,430 |  |  | 4,106 |  |  | 243,706 |  |  | 4,242 |
Total |  | $ | 193,189 |  |  | $ | 223 |  |  | $ | 558,570 |  |  | $ | 12,852 |  |  | $ | 751,759 |  |  | $ | 13,075 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 8,032 |  |  | $ | 148 |  |  | $ | 2,714 |  |  | $ | 12 |  |  | $ | 10,746 |  |  | $ | 160 |
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 June 30, 2015, are shown in the following table by contractual maturity or the expected call date, 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 |  | Weighted Avg Yield
U.S. Treasury and sponsored entities' obligations: |  |  |  |  |  |  |  |
Due one through five years |  | 100,000 |  |  | 99,911 |  |  | 1.05 | %
Due five through ten years |  | 496,887 |  |  | 489,008 |  |  | 2.36 | %
Total |  | $ | 596,887 |  |  | $ | 588,919 |  |  | 2.14 | %
U.S. Government sponsored entities' asset-backed securities: |  | $ | 770,895 |  |  | $ | 778,639 |  |  | 2.32 | %
Securities Held-to-Maturity (In thousands) |  | Amortized cost |  | Fair value |  | Weighted Avg Yield
U.S. Government sponsored entities' asset-backed securities |  | $ | 121,527 |  |  | $ | 123,546 |  |  | 3.52 | %

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