Information in Regard to Troubled Debt Restructurings that Occurred During Period (Detail) (Troubled Debt Restructuring, USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012 Contract	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	1	4
Pre-Modification Outstanding Balance	$ 190	$ 160	$ 306
Post-Modification Outstanding Balance	190	160	303
Residential
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	1	3
Pre-Modification Outstanding Balance	190	160	281
Post-Modification Outstanding Balance	190	160	278
Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	1
Pre-Modification Outstanding Balance	0	0	25
Post-Modification Outstanding Balance	0	0	25
Construction
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0
Pre-Modification Outstanding Balance	0	0	0
Post-Modification Outstanding Balance	0	0	0
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0
Pre-Modification Outstanding Balance	0	0	0
Post-Modification Outstanding Balance	0	0	0
Commercial Business
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0
Pre-Modification Outstanding Balance	0	0	0
Post-Modification Outstanding Balance	0	0	0
Other Consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0
Pre-Modification Outstanding Balance	0	0	0
Post-Modification Outstanding Balance	$ 0	$ 0	$ 0

Financing Receivable, Modifications, Number of Contracts, During Period

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- Details

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

+ Details

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

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