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Troubled Debt Restructurings by Class of Loan and Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	$ 281,476	$ 286,236
Residential
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	105,802	108,603
Land
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	9,437	9,657
Construction
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	11,815	11,763
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	69,568	68,902
Commercial Business
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	18,373	18,655
Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	35,538	37,286
Other Consumer
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	30,943	31,370
Troubled Debt Restructuring
Financing Receivable, Modifications [Line Items]
Accruing	1,457	221
Nonaccrual	2,614	4,099
Recorded investment in loans	4,071	4,320
Related Allowance For Loan Losses	1,230	1,293
Troubled Debt Restructuring | Residential
Financing Receivable, Modifications [Line Items]
Accruing	198	180
Nonaccrual	362	588
Recorded investment in loans	560	768
Related Allowance For Loan Losses	57	87
Troubled Debt Restructuring | Land
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	0	0
Recorded investment in loans	0	0
Related Allowance For Loan Losses	0	0
Troubled Debt Restructuring | Construction
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	111	170
Recorded investment in loans	111	170
Related Allowance For Loan Losses	0	0
Troubled Debt Restructuring | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Accruing	1,218	0
Nonaccrual	334	1,534
Recorded investment in loans	1,552	1,534
Related Allowance For Loan Losses	83	83
Troubled Debt Restructuring | Commercial Business
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,776	1,776
Recorded investment in loans	1,776	1,776
Related Allowance For Loan Losses	1,065	1,098
Troubled Debt Restructuring | Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	41	41
Nonaccrual	31	31
Recorded investment in loans	72	72
Related Allowance For Loan Losses	25	25
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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-Subparagraph a(ii)

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-Subsection I

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-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.

+ References

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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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