Loans - Loans by Class Modified as Troubled Debt Restructuring (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 SecurityLoan	Sep. 30, 2013 SecurityLoan	Sep. 30, 2014 SecurityLoan	Sep. 30, 2013 SecurityLoan
Financing Receivable Recorded Investment [Line Items]
Number of Loans	13	45	53	139
Pre-Modification Outstanding Recorded Investment	$ 1,037	$ 2,753	$ 3,665	$ 11,491
Post- Modification Recorded Investment	1,050	2,712	3,724	9,479
Permanent Real Estate Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans	6	14	27	40
Pre-Modification Outstanding Recorded Investment	643	1,316	2,254	5,795
Post- Modification Recorded Investment	45	1,363	2,310	3,966
Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans				2
Pre-Modification Outstanding Recorded Investment				2,127
Post- Modification Recorded Investment				487
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans	6	14	26	36
Pre-Modification Outstanding Recorded Investment	643	1,316	2,134	3,158
Post- Modification Recorded Investment	645	1,363	2,190	2,969
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans				1
Pre-Modification Outstanding Recorded Investment				469
Post- Modification Recorded Investment				469
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans			1	1
Pre-Modification Outstanding Recorded Investment			120	41
Post- Modification Recorded Investment			120	41
Construction Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans				1
Pre-Modification Outstanding Recorded Investment				942
Post- Modification Recorded Investment				823
Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans				1
Pre-Modification Outstanding Recorded Investment				942
Post- Modification Recorded Investment				823
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans	7	31	26	98
Pre-Modification Outstanding Recorded Investment	394	1,437	1,411	4,754
Post- Modification Recorded Investment	405	1,349	1,414	4,690
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans	7	31	26	94
Pre-Modification Outstanding Recorded Investment	394	1,437	1,411	3,963
Post- Modification Recorded Investment	405	1,349	1,414	3,886
Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Recorded Investment [Line Items]
Number of Loans				4
Pre-Modification Outstanding Recorded Investment				791
Post- Modification Recorded Investment				$ 804