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Troubled Debt Restructurings by Class of Loan and Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	$ 286,236	$ 281,356
Residential
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	108,603	116,868
Land
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	9,657	9,972
Construction
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	11,763	6,979
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	68,902	57,840
Commercial Business
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	18,655	20,776
Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	37,286	38,887
Other Consumer
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	31,370	30,034
Troubled Debt Restructuring
Financing Receivable, Modifications [Line Items]
Accruing	221	462
Nonaccrual	4,099	4,209
Recorded investment in loans	4,320	4,671
Related Allowance For Loan Losses	1,293	1,136
Troubled Debt Restructuring | Residential
Financing Receivable, Modifications [Line Items]
Accruing	180	112
Nonaccrual	588	516
Recorded investment in loans	768	628
Related Allowance For Loan Losses	87	11
Troubled Debt Restructuring | Land
Financing Receivable, Modifications [Line Items]
Accruing	0	135
Nonaccrual	0	0
Recorded investment in loans	0	135
Related Allowance For Loan Losses	0	0
Troubled Debt Restructuring | Construction
Financing Receivable, Modifications [Line Items]
Accruing	0	207
Nonaccrual	170	247
Recorded investment in loans	170	454
Related Allowance For Loan Losses	0	0
Troubled Debt Restructuring | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,534	1,603
Recorded investment in loans	1,534	1,603
Related Allowance For Loan Losses	83	211
Troubled Debt Restructuring | Commercial Business
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,776	1,843
Recorded investment in loans	1,776	1,843
Related Allowance For Loan Losses	1,098	914
Troubled Debt Restructuring | Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	41	8
Nonaccrual	31	0
Recorded investment in loans	72	8
Related Allowance For Loan Losses	25	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

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

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-Paragraph 8

-Subparagraph a(ii)

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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)

-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.

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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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