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Loans - Balance In ALLL and Recorded Investment In Loans By Portfolio Segment and Based on Impairment Method (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 1,493		$ 897
Collectively evaluated for impairment	3,949		5,213
Total ending allowance balance	5,442	5,434	6,110	6,955	8,050	9,758
Individually evaluated for impairment	11,560		12,131
Collectively evaluated for impairment	116,822		145,139
Subtotal	128,382		157,270
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	564		624
Collectively evaluated for impairment	443		1,657
Total ending allowance balance	1,007	1,386	2,281	2,519	2,754	1,879
Individually evaluated for impairment	797		821
Collectively evaluated for impairment	17,390		25,173
Subtotal	18,187		25,994
Real Estate [Member] | Single-family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	47
Collectively evaluated for impairment	184		207
Total ending allowance balance	231	245	207	190	242	241
Individually evaluated for impairment	129
Collectively evaluated for impairment	15,296		18,214
Subtotal	15,425		18,214
Real Estate [Member] | Multi-family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	585		11
Collectively evaluated for impairment	1,329		1,459
Total ending allowance balance	1,914	1,370	1,470	2,331	2,183	2,520
Individually evaluated for impairment	4,024		5,090
Collectively evaluated for impairment	18,876		22,073
Subtotal	22,900		27,163
Real Estate [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	297		262
Collectively evaluated for impairment	1,807		1,601
Total ending allowance balance	2,104	2,130	1,863	1,712	2,632	4,719
Individually evaluated for impairment	6,610		6,085
Collectively evaluated for impairment	51,077		63,672
Subtotal	57,687		69,757
Consumer [Member] | Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	174		272
Total ending allowance balance	174	286	272	186	220	303
Individually evaluated for impairment			135
Collectively evaluated for impairment	13,145		14,786
Subtotal	13,145		14,921
Consumer [Member] | Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	12		17
Total ending allowance balance	12	17	17	17	19	22
Collectively evaluated for impairment	1,038		1,221
Subtotal	$ 1,038		$ 1,221

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

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-Topic 310

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-Publisher FASB

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-Topic 310

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- Definition

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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-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Chapter V

-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 FASB

-Name Statement of Financial Accounting Standard (FAS)

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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

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- Definition

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

+ References

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph e

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-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 AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 116

-IssueDate 2006-05-01

-Chapter 8

-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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