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Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Short-term Debt [Line Items] |  |
Securities sold under agreements to repurchase and federal funds purchased | $ 240,594 | $ 279,669
Federal Home Loan Bank advances | 23,000 | 384,000
Total short-term borrowings | 263,594 | 663,669
Repurchase Agreements And Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Total short-term borrowings | 240,594 | 279,669
Highest month-end balance | 265,412 | 295,467
Average daily balance | 246,145 | 269,260
Weighted-average interest rate: As of year-end | 0.29% | 0.32%
Weighted-average interest rate: Paid during the year | 0.30% | 0.39%
Federal Home Loan Bank Advances [Member] |  |
Short-term Debt [Line Items] |  |
Total short-term borrowings | 23,000 | 384,000
Highest month-end balance | 232,000 | 384,000
Average daily balance | $ 51,392 | $ 31,679
Weighted-average interest rate: As of year-end | 0.40% | 0.19%
Weighted-average interest rate: Paid during the year | 0.18% | 0.39%

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