Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015 SecurityLoan	Mar. 31, 2014 SecurityLoan
Financing Receivable Modifications [Line Items]
Number of Loans	7	20
Pre-Modification Outstanding Recorded Investment	$ 795	$ 1,241
Post-Modification Recorded Investment	808	1,255
Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans		1
Pre-Modification Outstanding Recorded Investment		120
Post-Modification Recorded Investment		120
Commercial Loans [Member] \| Nonresidential [Member]
Financing Receivable Modifications [Line Items]
Number of Loans		1
Pre-Modification Outstanding Recorded Investment		120
Post-Modification Recorded Investment		120
Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans	5	9
Pre-Modification Outstanding Recorded Investment	441	569
Post-Modification Recorded Investment	454	576
Residential Mortgage Loans [Member] \| One-to Four-Family [Member]
Financing Receivable Modifications [Line Items]
Number of Loans	5	9
Pre-Modification Outstanding Recorded Investment	441	569
Post-Modification Recorded Investment	454	576
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans	2	10
Pre-Modification Outstanding Recorded Investment	354	552
Post-Modification Recorded Investment	354	559
Consumer Loans [Member] \| Home Equity [Member]
Financing Receivable Modifications [Line Items]
Number of Loans	2	10
Pre-Modification Outstanding Recorded Investment	354	552
Post-Modification Recorded Investment	$ 354	$ 559

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Number of financing receivables that have been 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=35738203&loc=SL6953676-111524

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- Definition

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