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Fair Value - Assets Measured At Fair Value on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Impaired loans:
Total impaired loans	$ 11,792	$ 15,393
Foreclosed assets
Foreclosed assets, net	1,525	2,370
Financial instruments measured at fair value on non-recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan servicing rights		9
Financial instruments measured at fair value on non-recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Impaired loans:
Total impaired loans	5,298	6,809
Financial instruments measured at fair value on non-recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Land [Member]
Foreclosed assets
Foreclosed assets, net		1,209
Financial instruments measured at fair value on non-recurring basis [Member] | Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member]
Impaired loans:
Total impaired loans	121	108
Financial instruments measured at fair value on non-recurring basis [Member] | Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member] | Non-owner occupied [Member]
Impaired loans:
Total impaired loans	1,806	2,887
Financial instruments measured at fair value on non-recurring basis [Member] | Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member] | Owner occupied [Member]
Impaired loans:
Total impaired loans	1,244	516
Financial instruments measured at fair value on non-recurring basis [Member] | Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member] | Land [Member]
Impaired loans:
Total impaired loans		233
Financial instruments measured at fair value on non-recurring basis [Member] | Real-estate [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family residential [Member]
Impaired loans:
Total impaired loans	57
Financial instruments measured at fair value on non-recurring basis [Member] | Real-estate [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multi-family residential [Member]
Impaired loans:
Total impaired loans	2,070
Financial instruments measured at fair value on non-recurring basis [Member] | Real-estate [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multi-family residential [Member]
Impaired loans:
Total impaired loans		$ 3,065

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- Definition

Loan servicing rights.

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph f

-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 3

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4437-111522



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 2, 9, 10, 11

-IssueDate 2006-05-01

-Chapter 11

-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

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

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