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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Reconciliation Of Segment Information [Line Items] |  |  |
Net Interest Income | $ 235,315 | $ 273,234 | $ 274,044
Depreciation Expense | 6,954 | 7,583 | 7,126
Other Expense | 181,014 | 180,734 | 179,981
Income Taxes | 25,701 | 34,415 | 16,636
Assets | 6,642,803 | 6,972,245 | 7,282,261
Deposits | 4,716,032 | 4,465,114 | 5,095,420
Totals for reportable segments |  |  |
Reconciliation Of Segment Information [Line Items] |  |  |
Net Interest Income | 230,573 | 271,079 | 272,759
Depreciation Expense | 6,954 | 7,583 | 7,126
Other Expense | 174,429 | 173,619 | 170,874
Income Taxes | 27,506 | 37,430 | 22,629
Assets | 6,656,933 | 7,014,353 | 7,330,712
Deposits | 4,822,465 | 4,619,691 | 5,263,187
Elimination of intersegment items |  |  |
Reconciliation Of Segment Information [Line Items] |  |  |
Net Interest Income | (4,948) | (974) | 0
Depreciation Expense | 0 | 0 | 0
Other Expense | 0 | 0 | 0
Income Taxes | 0 | 0 | 0
Assets | (35,639) | (63,243) | (77,876)
Deposits | (106,433) | (154,577) | (167,767)
Parent Co. totals - not eliminated |  |  |
Reconciliation Of Segment Information [Line Items] |  |  |
Net Interest Income | 9,690 | 3,129 | 1,285
Depreciation Expense | 0 | 0 | 0
Other Expense | 6,585 | 7,115 | 9,107
Income Taxes | (1,805) | (3,015) | (5,993)
Assets | 21,509 | 21,135 | 29,425
Deposits | $ 0 | $ 0 | $ 0

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