Allowance for Loan Losses and Recorded Investment in Loans Receivable (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 4,367	$ 4,549
Charge-offs	(66)	(1,041)
Recoveries	53	155
Provisions		704
Ending Balance	4,354	4,367
Individually evaluated for impairment	19,623	25,847
Allowance for loan losses	2,364	2,384
Collectively evaluated for impairment	104,189	101,949
Allowance for loan losses	1,990	1,983
Ending balance	123,812	127,796
Total allowance for loan losses	4,354	4,367	4,367
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,040	1,887
Charge-offs		(118)
Recoveries	2	52
Provisions		(781)
Ending Balance	1,042	1,040
Individually evaluated for impairment	1,015	1,869
Allowance for loan losses	49	49
Collectively evaluated for impairment	8,600	7,155
Allowance for loan losses	993	991
Ending balance	9,615	9,024
Total allowance for loan losses	1,042	1,040
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,675	1,920
Charge-offs	(27)	(339)
Recoveries	50	94
Provisions	(190)
Ending Balance	1,508	1,675
Individually evaluated for impairment	12,194	16,661
Allowance for loan losses	1,240	1,260
Collectively evaluated for impairment	60,146	58,549
Allowance for loan losses	268	415
Ending balance	72,340	75,210
Total allowance for loan losses	1,508	1,675
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,301	484
Charge-offs	(39)	(576)
Recoveries	1	5
Provisions	154	1,388
Ending Balance	1,417	1,301
Individually evaluated for impairment	4,762	5,586
Allowance for loan losses	959	962
Collectively evaluated for impairment	27,663	28,212
Allowance for loan losses	458	339
Ending balance	32,425	33,798
Total allowance for loan losses	1,417	1,301
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	351	258
Charge-offs		(8)
Recoveries		4
Provisions	36	97
Ending Balance	387	351
Individually evaluated for impairment	1,652	1,731
Allowance for loan losses	116	113
Collectively evaluated for impairment	7,780	8,033
Allowance for loan losses	271	238
Ending balance	9,432	9,764
Total allowance for loan losses	$ 387	$ 351

Allowance for Loan and Lease Losses, Loan Recoveries

No definition available.

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- Definition

Allowance for Loan and Lease Losses, Net Charge Offs

+ References

No definition available.

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- Definition

Financing Receivable, Evaluated for Impairment

+ References

No definition available.

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- Definition

Loans and Leases Receivable, Allowance for Losses

+ References

No definition available.

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- Definition

Reflects the amount charged against earnings during the period as bad debt expense, net of recoveries of previously expensed credit losses.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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- 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

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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- Definition

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

+ References

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually 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

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

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-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-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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-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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