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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2011
Investment Securities [Abstract] |
Schedule Of Investment Securities |
Amortized |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Holding Gains |  |  | Holding Losses |  |  | Fair Value |
2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 370,043 |  |  | $ | 1,614 |  |  | $ | - |  |  | $ | 371,657 |
Obligations of states and political subdivisions |  |  | 2,616 |  |  |  | 44 |  |  |  | - |  |  |  | 2,660 |
U.S. Government sponsored entities' asset-backed securities |  |  | 427,300 |  |  |  | 16,995 |  |  |  | - |  |  |  | 444,295 |
Other equity securities |  |  | 1,188 |  |  |  | 877 |  |  |  | (32 | ) |  |  | 2,033 |
Total |  | $ | 801,147 |  |  | $ | 19,530 |  |  | $ | (32 | ) |  | $ | 820,645 |
2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 1,992 |  |  | $ | 5 |  |  | $ | - |  |  | $ | 1,997 |
U.S. Government sponsored entities' asset-backed securities |  |  | 818,232 |  |  |  | 14,377 |  |  |  | (32 | ) |  |  | 832,577 |
Total |  | $ | 820,224 |  |  | $ | 14,382 |  |  | $ | (32 | ) |  | $ | 834,574 |
Amortized |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Holding Gains |  |  | Holding Losses |  |  | Fair Value |
2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 272,301 |  |  | $ | 2,968 |  |  | $ | 1,956 |  |  | $ | 273,313 |
Obligations of states and political subdivisions |  |  | 10,815 |  |  |  | 281 |  |  |  | 52 |  |  |  | 11,044 |
U.S. Government sponsored entities' asset-backed securities |  |  | 990,204 |  |  |  | 30,633 |  |  |  | 9,425 |  |  |  | 1,011,412 |
Other equity securities |  |  | 938 |  |  |  | 858 |  |  |  | 43 |  |  |  | 1,753 |
Total |  | $ | 1,274,258 |  |  | $ | 34,740 |  |  | $ | 11,476 |  |  | $ | 1,297,522 |
2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 3,167 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 3,174 |
U.S. Government sponsored entities' asset-backed securities |  |  | 670,403 |  |  |  | 17,157 |  |  |  | 4,620 |  |  |  | 682,940 |
Total |  | $ | 673,570 |  |  | $ | 17,164 |  |  | $ | 4,620 |  |  | $ | 686,114 |
Schedule Of Unrealized Loss On Securities |
Less than |  |  | 12 Months |  |  |  |
|  | 12 Months |  |  | or Longer |  |  | Total |
|  |  |  |  | Unrealized |  |  |  |  |  | Unrealized |  |  |  |  |  | Unrealized |
(In thousands) |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other equity securities |  | $ | - |  |  | $ | - |  |  | $ | 80 |  |  | $ | 32 |  |  | $ | 80 |  |  | $ | 32 |
2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | - |  |  | $ | - |  |  | $ | 38,775 |  |  | $ | 32 |  |  | $ | 38,775 |  |  | $ | 32 |
Less than |  |  | 12 Months |  |  |  |
|  | 12 Months |  |  | or Longer |  |  | Total |
|  |  |  |  | Unrealized |  |  |  |  |  | Unrealized |  |  |  |  |  | Unrealized |
(In thousands) |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 74,379 |  |  | $ | 1,956 |  |  | $ | — |  |  | $ | — |  |  | $ | 74,379 |  |  | $ | 1,956 |
Obligations of states and political subdivisions |  |  | 1,459 |  |  |  | 52 |  |  |  | — |  |  |  | — |  |  |  | 1,459 |  |  |  | 52 |
U.S. Government sponsored entities' asset-backed securities |  |  | 418,156 |  |  |  | 9,425 |  |  |  | — |  |  |  | — |  |  |  | 418,156 |  |  |  | 9,425 |
Other equity securities |  |  | 74 |  |  |  | 29 |  |  |  | 221 |  |  |  | 14 |  |  |  | 295 |  |  |  | 43 |
Total |  | $ | 494,068 |  |  | $ | 11,462 |  |  | $ | 221 |  |  | $ | 14 |  |  | $ | 494,289 |  |  | $ | 11,476 |
2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 297,584 |  |  | $ | 4,620 |  |  | $ | — |  |  | $ | — |  |  | $ | 297,584 |  |  | $ | 4,620 |
Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity |
|  | Amortized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Fair Value |
Securities Available-for-Sale |  |  |  |  |  |  |  |
U.S. Treasury and sponsored entities' notes: |  |  |  |  |  |  |  |
Due within one year |  | $ | 370,043 |  |  | $ | 371,657 |
Total |  | $ | 370,043 |  |  | $ | 371,657 |
Obligations of states and political subdivisions: |  |  |  |  |  |  |  |
Due within one year |  | $ | 2,121 |  |  | $ | 2,133 |
Due one through five years |  |  | 495 |  |  |  | 527 |
Total |  | $ | 2,616 |  |  | $ | 2,660 |
U.S. Government sponsored entities' asset-backed securities: |  |  |  |  |  |  |  |
Total |  | $ | 427,300 |  |  | $ | 444,295 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |
Obligations of states and political subdivisions: |  |  |  |  |  |  |  |
Due within one year |  | $ | 1,992 |  |  | $ | 1,997 |
Total |  | $ | 1,992 |  |  | $ | 1,997 |
U.S. Government sponsored entities' asset-backed securities: |  |  |  |  |  |  |  |
Total |  | $ | 818,232 |  |  | $ | 832,577 |

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