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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning balance, All Other Net Unrealized Gain | $ 121,391 |
Beginning balance, OTTI Related Net Unrealized Loss | (1,658) |
Beginning balance, HTM related Net Unrealized Gain | 2,594 |
Beginning balance, Defined Benefit Pension and Post-retirement Plans | (68,287) |
Beginning balance, Total Accumulated OCI | 54,040 |
OCI before reclassifications, OTTI related | 19 |
OCI before reclassifications | 2,394 | 12,873
OCI before reclassifications, Defined Benefit Pension and Post- retirement Plans | 28,600 |
OCI before reclassifications, Total Accumulated AOCI | 31,013 |
Amounts reclassified from AOCI, OTTI Related | 5 |
Amounts reclassified from AOCI, HTM Related | (466) |
Amounts reclassified from AOCI, All Other | (3,884) |
Amounts reclassified from AOCI, Defined Benefit Pension and Post Retirement Plans | 1,213 |
Amounts reclassified from AOCI, Total Accumulated OCI | (3,132) |
Net current period OCI, OTTI related | 24 |
Net current period OCI, HTM Related | (572) |
OCI before reclassifications | (1,384) |
Net current period OCI, defined benefit pension and post retirement plans | 29,813 | 928
Other comprehensive income | 27,881 | 10,690
Ending balance, OTTI Related Net Unrealized Loss | (1,634) |
Ending balance, HTM related Net Unrealized Gain | 2,022 |
Ending balance, All Other Net Unrealized Gain | 120,007 |
Ending balance, Defined Benefit Pension and Post-retirement Plans | (38,474) |
Ending balance, Total Accumulated OCI | 81,921 |
Held-to-maturity Securities [Member] |  |
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
OCI before reclassifications | (106) |
Available-for-sale Securities [Member] |  |
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
OCI before reclassifications | $ 2,500 |

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