The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

Reference 3: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: 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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 9

-Section 03

-Paragraph 7

-Subparagraph d

Reference 6: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 7: 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

+ Details

Loans (Unallocated Portion Of The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	$ 110,147	$ 126,316	$ 125,309	$ 110,244
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	30,286	24,796	19,912	10,719
Unallocated [Member] \| Excessive Industry Concentrations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	6,995	1,720
Unallocated [Member] \| Large Relationship Concentrations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	2,232	2,127
Unallocated [Member] \| Highly- Leveraged Credit Relationships [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	3,530
Unallocated [Member] \| Policy Exceptions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	2,121	2,414
Unallocated [Member] \| Credit And Collateral Exceptions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	1,603	557
Unallocated [Member] \| Loans Not Reviewed By Concurrence [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	9,030
Unallocated [Member] \| Adjustment For Recoveries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	(13,071)
Unallocated [Member] \| General Macroeconomic Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portion of the allowance for loan losses	$ 17,846	$ 17,978