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Loans and Leases (Loans Acquired By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | $ 1,897,097 | [1] | $ 2,362,152 | [2] | $ 2,557,450 | [1]
Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,542,482 |  | 1,872,685 |  | 2,013,636 |
Commercial Mortgage | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 258,388 |  | 338,873 |  | 405,658 |
Commercial Mortgage | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,109,048 |  | 1,260,589 |  | 1,310,083 |
Commercial Mortgage | Other Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 113,954 |  | 158,394 |  | 159,007 |
Commercial Mortgage | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 59,787 |  | 113,442 |  | 137,253 |
Commercial Mortgage | Lease Financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 57 |  | 162 |
Commercial Mortgage | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,305 |  | 1,330 |  | 1,473 |
Non-Commercial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 354,615 |  | 489,467 |  | 543,814 |
Non-Commercial Loans | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 26,408 |  | 105,536 |  | 115,126 |
Non-Commercial Loans | Residential Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 289,160 |  | 327,568 |  | 380,405 |
Non-Commercial Loans | Revolving Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 37,280 |  | 51,552 |  | 39,709 |
Non-Commercial Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,767 |  | 4,811 |  | 8,574 |
Impaired At Acquisition Date |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 290,724 |  | 458,305 |  | 499,705 |
Impaired At Acquisition Date | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 214,628 |  | 317,240 |  | 368,813 |
Impaired At Acquisition Date | Commercial Mortgage | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 72,873 |  | 117,603 |  | 172,309 |
Impaired At Acquisition Date | Commercial Mortgage | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 103,219 |  | 138,465 |  | 125,379 |
Impaired At Acquisition Date | Commercial Mortgage | Other Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 29,769 |  | 33,370 |  | 40,514 |
Impaired At Acquisition Date | Commercial Mortgage | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 8,767 |  | 27,802 |  | 30,611 |
Impaired At Acquisition Date | Commercial Mortgage | Lease Financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 0 |  | 0 |
Impaired At Acquisition Date | Commercial Mortgage | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 0 |  | 0 |
Impaired At Acquisition Date | Non-Commercial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 76,096 |  | 141,065 |  | 130,892 |
Impaired At Acquisition Date | Non-Commercial Loans | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 19,008 |  | 78,108 |  | 74,414 |
Impaired At Acquisition Date | Non-Commercial Loans | Residential Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 48,245 |  | 46,130 |  | 45,384 |
Impaired At Acquisition Date | Non-Commercial Loans | Revolving Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 8,787 |  | 15,350 |  | 9,939 |
Impaired At Acquisition Date | Non-Commercial Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 56 |  | 1,477 |  | 1,155 |
All Other Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,606,373 |  | 1,903,847 |  | 2,057,745 |
All Other Acquired Loans | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,327,854 |  | 1,555,445 |  | 1,644,823 |
All Other Acquired Loans | Commercial Mortgage | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 185,515 |  | 221,270 |  | 233,349 |
All Other Acquired Loans | Commercial Mortgage | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,005,829 |  | 1,122,124 |  | 1,184,704 |
All Other Acquired Loans | Commercial Mortgage | Other Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 84,185 |  | 125,024 |  | 118,493 |
All Other Acquired Loans | Commercial Mortgage | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 51,020 |  | 85,640 |  | 106,642 |
All Other Acquired Loans | Commercial Mortgage | Lease Financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 57 |  | 162 |
All Other Acquired Loans | Commercial Mortgage | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,305 |  | 1,330 |  | 1,473 |
All Other Acquired Loans | Non-Commercial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 278,519 |  | 348,402 |  | 412,922 |
All Other Acquired Loans | Non-Commercial Loans | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 7,400 |  | 27,428 |  | 40,712 |
All Other Acquired Loans | Non-Commercial Loans | Residential Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 240,915 |  | 281,438 |  | 335,021 |
All Other Acquired Loans | Non-Commercial Loans | Revolving Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 28,493 |  | 36,202 |  | 29,770 |
All Other Acquired Loans | Non-Commercial Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | $ 1,711 |  | $ 3,334 |  | $ 7,419 |
[1] | Unaudited
[2] | Derived from 2011 Annual Report on Form 10-K.

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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration