The total amount of contractually specified mortgage servicing fees earned for each period for which results of operations are presented. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the mortgage loan being serviced and the rate to be paid to the beneficial owners of the asset.

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- Definition

Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Asset Obtained as Proceeds

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- Definition

Weighted average of mortgage servicing fees for each period presented.

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- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

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- Definition

This is the principal amount outstanding for securitized loans only (across all types of loans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6942082&loc=d3e107314-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph i
-Clause 4
-Subclause a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph B11
-Subparagraph b
-Clause 6
-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.

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- Definition

The total principal outstanding of financial assets transferred in a securitization, asset-backed financing arrangement, or similar transfer that has been accounted for as sales and in which the transferor continues to have involvement, including both the derecognized and recognized portion of such transferred assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph f
-Clause 2
-Subclause a
-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 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6942082&loc=d3e107314-111719

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4 and FIN46(R)-8
-Paragraph B11
-Subparagraph b
-Clause 1
-Subclause b
-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.

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- Definition

Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph h
-Clause 2
-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 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6942082&loc=d3e107207-111719

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6899544&loc=d3e96813-111708

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph B11
-Subparagraph a
-Clause 2
-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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Transfers of Financial Assets and Mortgage Servicing Rights - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Residential Mortgage	Jun. 30, 2010 Residential Mortgage	Jun. 30, 2011 Residential Mortgage	Jun. 30, 2010 Residential Mortgage	Jun. 30, 2011 Residential Mortgage Mortgage backed securities	Jun. 30, 2010 Residential Mortgage Mortgage backed securities	Jun. 30, 2011 Residential Mortgage Mortgage backed securities	Jun. 30, 2010 Residential Mortgage Mortgage backed securities	Jun. 30, 2011 Residential Mortgage Servicing Asset At Fair Value Amount	Jun. 30, 2010 Residential Mortgage Servicing Asset At Fair Value Amount	Jun. 30, 2011 Residential Mortgage Servicing Asset At Fair Value Amount	Jun. 30, 2010 Residential Mortgage Servicing Asset At Fair Value Amount	Jun. 30, 2011 Loans	Jun. 30, 2010 Loans	Jun. 30, 2011 Serviced Mortgage Loans	Dec. 31, 2010 Serviced Mortgage Loans	Jun. 30, 2010 Serviced Mortgage Loans	Jun. 30, 2011 Serviced Mortgage Loans Loans with Recourse	Dec. 31, 2010 Serviced Mortgage Loans Loans with Recourse	Jun. 30, 2010 Serviced Mortgage Loans Loans with Recourse	Jun. 30, 2011 Buy back option program	Dec. 31, 2010 Buy back option program	Jun. 30, 2010 Buy back option program
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Assets obtained as proceeds from loans securitized					$ 270,415,000	$ 209,801,000	$ 604,956,000	$ 418,598,000	$ 265,000,000	$ 206,000,000	$ 594,000,000	$ 411,000,000	$ 4,890,000	$ 3,794,000	$ 10,839,000	$ 7,535,000
Servicing rights on whole loan sales, principal balance																	53,000,000	41,000,000
Mortgage securitizations / Loan sales, net gains					4,100,000	5,000,000	10,400,000	10,300,000									1,100,000	800,000
Mortgage loans serviced																			17,400,000,000	18,400,000,000	17,900,000,000	3,700,000,000	4,000,000,000	4,200,000,000
Mortgage servicing fees, amount excluding fair value adjustments	12,400,000	11,900,000	24,800,000	23,800,000
Weighted average mortgage servicing fees	0.26%	0.27%	0.26%	0.27%
Mortgage loans related to buy-back option program																									$ 156,000,000	$ 168,000,000	$ 141,000,000