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Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Covered Loans Which Have Adverse Change In Expected Cash Flows | $ 739,900 |  | $ 1,892,721 |  |  |
Total impaired noncovered loans and leases | 159,591 |  | 112,030 |  | 172,984 |
Unpaid principal balance | 174,163 |  | 126,877 |  | 192,238 |
Related allowance recorded | 96,473 |  | 86,117 |  |  |
Allowance for loan and lease losses | 273,019 | [1] | 272,500 | [1] | 319,018 | [2]
Average balance | 161,014 |  | 116,623 |  |  |
Interest income recognized | 2,123 |  | 787 |  |  |
Troubled debt restructurings | 320,642 |  | 318,323 |  | 333,170 |
Construction and Land Development - Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 9,282 |  | 19,768 |  | 16,057 |
Unpaid principal balance | 20,303 |  | 33,430 |  | 31,879 |
Average balance | 9,284 |  | 23,129 |  |  |
Interest income recognized | 112 |  | 58 |  |  |
Commercial Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 102,987 |  | 63,366 |  | 111,808 |
Unpaid principal balance | 105,270 |  | 64,551 |  | 114,351 |
Average balance | 103,848 |  | 64,206 |  |  |
Interest income recognized | 1,425 |  | 530 |  |  |
Other Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 3,148 |  | 1,521 |  | 3,248 |
Unpaid principal balance | 3,203 |  | 1,521 |  | 3,348 |
Average balance | 3,179 |  | 2,050 |  |  |
Interest income recognized | 45 |  | 15 |  |  |
Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 18,520 |  | 12,598 |  | 18,800 |
Unpaid principal balance | 19,098 |  | 12,598 |  | 19,196 |
Average balance | 18,997 |  | 12,466 |  |  |
Interest income recognized | 266 |  | 66 |  |  |
Lease Financing |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 349 |  | 79 |  | 746 |
Unpaid principal balance | 349 |  | 79 |  | 746 |
Average balance | 355 |  | 201 |  |  |
Interest income recognized | 6 |  | 1 |  |  |
Other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases |  |  |  |  | 707 |
Unpaid principal balance |  |  |  |  | 707 |
Revolving Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 5,471 |  |  |  | 4,203 |
Unpaid principal balance | 5,471 |  |  |  | 4,203 |
Average balance | 5,472 |  |  |  |  |
Interest income recognized | 25 |  |  |  |  |
Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 17,285 |  | 10,438 |  | 13,586 |
Unpaid principal balance | 17,921 |  | 10,438 |  | 13,978 |
Average balance | 17,330 |  | 10,107 |  |  |
Interest income recognized | 228 |  | 90 |  |  |
Construction and Land Development - Non - Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 866 |  | 3,345 |  | 1,320 |
Unpaid principal balance | 865 |  | 3,345 |  | 1,321 |
Average balance | 866 |  | 3,510 |  |  |
Interest income recognized | 11 |  | 23 |  |  |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 1,683 |  | 915 |  | 2,509 |
Unpaid principal balance | 1,683 |  | 915 |  | 2,509 |
Average balance | 1,683 |  | 954 |  |  |
Interest income recognized | 5 |  | 4 |  |  |
With A Recorded Allowance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 12,512 |  | 9,037 |  | 16,819 |
With A Recorded Allowance | Construction and Land Development - Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 458 |  | 2,487 |  | 2,340 |
With A Recorded Allowance | Commercial Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 7,896 |  | 4,915 |  | 10,628 |
With A Recorded Allowance | Other Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 101 |  | 196 |  | 279 |
With A Recorded Allowance | Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 2,972 |  | 574 |  | 1,949 |
With A Recorded Allowance | Lease Financing |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 215 |  | 4 |  | 194 |
With A Recorded Allowance | Other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded |  |  |  |  | 53 |
With A Recorded Allowance | Revolving Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 44 |  |  |  | 1 |
With A Recorded Allowance | Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 566 |  | 674 |  | 832 |
With A Recorded Allowance | Construction and Land Development - Non - Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 81 |  | 145 |  | 287 |
With A Recorded Allowance | Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Related allowance recorded | 179 |  | 42 |  | 256 |
Noncovered Loans | With A Recorded Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 55,452 |  | 97,456 |  | 68,463 |
Noncovered Loans | With A Recorded Allowance [Member] | Commercial Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 32,248 |  | 54,593 |  | 39,648 |
Noncovered Loans | With A Recorded Allowance [Member] | Other Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 528 |  | 1,521 |  | 1,425 |
Noncovered Loans | With A Recorded Allowance [Member] | Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 7,055 |  | 6,797 |  | 7,429 |
Noncovered Loans | With A Recorded Allowance [Member] | Lease Financing |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 349 |  | 79 |  | 665 |
Noncovered Loans | With A Recorded Allowance [Member] | Other Credit Derivatives [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  | 0 |
Noncovered Loans | With A Recorded Allowance [Member] | Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 9,465 |  | 10,438 |  | 9,346 |
Noncovered Loans | With A Recorded Allowance [Member] | Revolving Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 1,925 |  |  |  | 1,238 |
Noncovered Loans | With A Recorded Allowance [Member] | Construction and Land Development - Non - Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 866 |  | 3,345 |  | 1,162 |
Noncovered Loans | With A Recorded Allowance [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 1,683 |  | 915 |  | 1,609 |
Noncovered Loans | With A Recorded Allowance [Member] | Construction And Land Development - Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 1,333 |  | 19,768 |  | 5,941 |
Noncovered Loans | With No Recorded Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total impaired noncovered loans and leases | 104,139 |  | 14,574 |  | 104,521 |
Noncovered Loans | With No Recorded Allowance [Member] | Commercial Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 70,739 |  | 8,773 |  | 72,160 |
Noncovered Loans | With No Recorded Allowance [Member] | Other Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 2,620 |  | 0 |  | 1,823 |
Noncovered Loans | With No Recorded Allowance [Member] | Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 11,465 |  | 5,801 |  | 11,371 |
Noncovered Loans | With No Recorded Allowance [Member] | Lease Financing |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 0 |  | 0 |  | 81 |
Noncovered Loans | With No Recorded Allowance [Member] | Other Credit Derivatives [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  | 707 |
Noncovered Loans | With No Recorded Allowance [Member] | Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 7,820 |  | 0 |  | 4,240 |
Noncovered Loans | With No Recorded Allowance [Member] | Revolving Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 3,546 |  |  |  | 2,965 |
Noncovered Loans | With No Recorded Allowance [Member] | Construction and Land Development - Non - Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 0 |  | 0 |  | 158 |
Noncovered Loans | With No Recorded Allowance [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | 0 |  | 0 |  | 900 |
Noncovered Loans | With No Recorded Allowance [Member] | Construction And Land Development - Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | $ 7,949 |  | $ 0 |  | $ 10,116 |
[1] | Unaudited
[2] | Derived from 2012 Annual Report on Form 10-K.

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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