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Troubled Debt Restructurings by Class of Loan and Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	$ 279,750	$ 281,356
Residential
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	112,235	116,868
Land
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	9,826	9,972
Construction
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	7,967	6,979
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	60,201	57,840
Commercial Business
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	20,030	20,776
Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	38,344	38,887
Other Consumer
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	31,147	30,034
Troubled Debt Restructuring
Financing Receivable, Modifications [Line Items]
Accruing	586	462
Nonaccrual	4,094	4,209
Recorded investment in loans	4,680	4,671
Related Allowance For Loan Losses	1,056	1,136
Troubled Debt Restructuring | Residential
Financing Receivable, Modifications [Line Items]
Accruing	290	112
Nonaccrual	376	516
Recorded investment in loans	666	628
Related Allowance For Loan Losses	25	11
Troubled Debt Restructuring | Land
Financing Receivable, Modifications [Line Items]
Accruing	136	135
Nonaccrual	0	0
Recorded investment in loans	136	135
Related Allowance For Loan Losses	0	0
Troubled Debt Restructuring | Construction
Financing Receivable, Modifications [Line Items]
Accruing	160	207
Nonaccrual	265	247
Recorded investment in loans	425	454
Related Allowance For Loan Losses	0	0
Troubled Debt Restructuring | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,577	1,603
Recorded investment in loans	1,577	1,603
Related Allowance For Loan Losses	89	211
Troubled Debt Restructuring | Commercial Business
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,843	1,843
Recorded investment in loans	1,843	1,843
Related Allowance For Loan Losses	914	914
Troubled Debt Restructuring | Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	0	8
Nonaccrual	33	0
Recorded investment in loans	33	8
Related Allowance For Loan Losses	28	0
Troubled Debt Restructuring | Other Consumer
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	0	0
Recorded investment in loans	0	0
Related Allowance For Loan Losses	$ 0	$ 0

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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.



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 50

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.7(d))

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-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

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-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.



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher FASB

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-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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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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-Publisher FASB

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-Publisher AICPA

-Name Statement of Position (SOP)

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-Paragraph 13

-Subparagraph e

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Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

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-Name Accounting Standards Codification

-Topic 310

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524



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