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Investment Securities (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract] |  |
Schedule Of Investment Securities | Investment securities at September 30, 2013, 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 |  | $ | 645,631 |  |  | $ | 115 |  |  | $ | 40,001 |  |  | $ | 605,745 |
Obligations of states and political subdivisions |  | 220 |  |  | 1 |  |  | — |  |  | 221 |
U.S. Government sponsored entities' asset-backed securities |  | 519,917 |  |  | 10,330 |  |  | 9,222 |  |  | 521,025 |
Other equity securities |  | 1,120 |  |  | 1,372 |  |  | — |  |  | 2,492 |
Total |  | $ | 1,166,888 |  |  | $ | 11,818 |  |  | $ | 49,223 |  |  | $ | 1,129,483 |
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 |  | $ | 240 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 241 |
U.S. Government sponsored entities' asset-backed securities |  | 193,757 |  |  | 5,958 |  |  | 15 |  |  | 199,700 |
Total |  | $ | 193,997 |  |  | $ | 5,959 |  |  | $ | 15 |  |  | $ | 199,941 |
| Investment securities at December 31, 2012, 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 |  | $ | 695,655 |  |  | $ | 1,352 |  |  | $ | 1,280 |  |  | $ | 695,727 |
Obligations of states and political subdivisions |  | 984 |  |  | 19 |  |  | — |  |  | 1,003 |
U.S. Government sponsored entities' asset-backed securities |  | 401,882 |  |  | 14,067 |  |  | 447 |  |  | 415,502 |
Other equity securities |  | 1,137 |  |  | 1,085 |  |  | — |  |  | 2,222 |
Total |  | $ | 1,099,658 |  |  | $ | 16,523 |  |  | $ | 1,727 |  |  | $ | 1,114,454 |
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 |  | $ | 570 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 572 |
U.S. Government sponsored entities' asset-backed securities |  | 400,820 |  |  | 9,351 |  |  | 38 |  |  | 410,133 |
Total |  | $ | 401,390 |  |  | $ | 9,353 |  |  | $ | 38 |  |  | $ | 410,705 |
Schedule Of Unrealized Loss On Securities | Securities with unrealized losses at September 30, 2013, 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 |  | $ | 580,631 |  |  | $ | 40,001 |  |  | $ | — |  |  | $ | — |  |  | $ | 580,631 |  |  | $ | 40,001 |
U.S. Government agencies' asset-backed securities |  | $ | 261,211 |  |  | $ | 9,222 |  |  | $ | — |  |  | $ | — |  |  | $ | 261,211 |  |  | $ | 9,222 |
Total |  | $ | 841,842 |  |  | $ | 49,223 |  |  | $ | — |  |  | $ | — |  |  | $ | 841,842 |  |  | $ | 49,223 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 5,817 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,817 |  |  | $ | 15 |
| Securities with unrealized losses at December 31, 2012, 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 |  | $ | 177,470 |  |  | $ | 1,280 |  |  | $ | — |  |  | $ | — |  |  | $ | 177,470 |  |  | $ | 1,280 |
U.S. Government sponsored entities' asset-backed securities |  | 123,631 |  |  | 447 |  |  | — |  |  | — |  |  | 123,631 |  |  | 447 |
Total |  | $ | 301,101 |  |  | $ | 1,727 |  |  | $ | — |  |  | $ | — |  |  | $ | 301,101 |  |  | $ | 1,727 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 10,120 |  |  | $ | 38 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,120 |  |  | $ | 38 |
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, 2013, 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
U.S. Treasury and sponsored entities' obligations: |  |  |  |  |  |
Due within one year |  | $ | 25,000 |  |  | $ | 25,115 |
Due one through five years |  | 100,000 |  |  | 96,715 |
Due five through ten years |  | 396,881 |  |  | 372,909 |
Due in over ten years |  | 123,750 |  |  | 111,006 |
Total |  | $ | 645,631 |  |  | $ | 605,745 |
Obligations of states and political subdivisions: |  |  |  |  |  |
Due within one year |  | $ | 220 |  |  | $ | 221 |
U.S. Government sponsored entities' asset-backed securities: |  | $ | 519,917 |  |  | $ | 521,025 |
Securities Held-to-Maturity (In thousands) |  | Amortized cost |  | Fair value
Obligations of state and political subdivisions: |  |  |  |  |  |
Due within one year |  | $ | 240 |  |  | $ | 241 |
U.S. Government sponsored entities' asset-backed securities |  | $ | 193,757 |  |  | $ | 199,700 |

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