Loan Modifications for Corporation's Loans Receivable (Detail) (Troubled Debt Restructuring, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013 Contract	Jun. 30, 2013 Contract
Added during current period
Financing Receivable, Modifications [Line Items]
Number of New Contracts	5	6
Pre Modification Outstanding Recorded Investment	$ 636	$ 721
Post Modification Outstanding Recorded Investment	636	716
Added during current period \| Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of New Contracts	2	2
Pre Modification Outstanding Recorded Investment	326	326
Post Modification Outstanding Recorded Investment	326	326
Added during current period \| Other Consumer
Financing Receivable, Modifications [Line Items]
Number of New Contracts	2	3
Pre Modification Outstanding Recorded Investment	261	346
Post Modification Outstanding Recorded Investment	261	341
Added during current period \| Residential 1-4 family
Financing Receivable, Modifications [Line Items]
Number of New Contracts	1	1
Pre Modification Outstanding Recorded Investment	49	49
Post Modification Outstanding Recorded Investment	49	49
Defaulted during the period
Financing Receivable, Modifications [Line Items]
Number of New Contracts	2	2
Post Modification Outstanding Recorded Investment	187	187
Defaulted Recorded Investment	187	187
Defaulted during the period \| Other Consumer
Financing Receivable, Modifications [Line Items]
Number of New Contracts	2	2
Post Modification Outstanding Recorded Investment	187	187
Defaulted Recorded Investment	$ 187	$ 187

Financing Receivable, Modifications, Number of Contracts, During Period

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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

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- Definition

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

+ References

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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