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Segment Information (Reconciliation Of Financial Information) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Reconciliation Of Segment Information [Line Items] |  |  |
Net Interest Income | $ 273,234 | $ 274,044 | $ 273,491
Depreciation Expense | 7,583 | 7,126 | 7,473
Other Expense | 180,734 | 179,981 | 181,252
Income taxes | 34,415 | 16,636 | 22,943
Assets | 6,972,245 | 7,282,261 | 7,040,329
Deposits | 4,465,114 | 5,095,420 | 5,188,052
Totals For Reportable Segments [Member] |  |  |
Reconciliation Of Segment Information [Line Items] |  |  |
Net Interest Income | 263,360 | 265,148 | 261,741
Depreciation Expense | 7,562 | 7,109 | 7,451
Other Expense | 170,052 | 168,565 | 168,688
Income taxes | 37,748 | 21,547 | 28,208
Assets | 6,932,682 | 7,287,503 | 7,080,238
Deposits | 4,611,678 | 5,256,125 | 5,359,013
Elimination Of Intersegment Items [Member] |  |  |
Reconciliation Of Segment Information [Line Items] |  |  |
Assets | (57,286) | (77,876) | (114,214)
Deposits | (146,564) | (160,705) | (170,961)
Parent Co. & GFSC Totals-Not Eliminated [Member] |  |  |
Reconciliation Of Segment Information [Line Items] |  |  |
Net Interest Income | 9,874 | 8,896 | 11,750
Depreciation Expense | 21 | 17 | 22
Other Expense | 10,682 | 11,416 | 12,564
Income taxes | (3,333) | (4,911) | (5,265)
Assets | $ 96,849 | $ 72,634 | $ 74,305

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