Loans - Risk Category of Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	$ 1,103,988	$ 1,049,165	$ 1,049,165
Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	829,850	780,444	780,444
Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	9,635	9,683
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	645,211	585,025
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	52,938	54,485
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	122,066	131,251
Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	52,984	53,349	53,349
Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	51,974	53,349
Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,010
Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	182,027	189,231	189,231
Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,869	5,669
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	155,083	159,795
Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,088	4,308
Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	15,983	17,347
Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,004	2,112
Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	39,127	26,141
Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	39,001	25,714
Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	126	427
Unclassified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,047,472	979,700
Unclassified [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	785,962	724,005
Unclassified [Member] | Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	9,148	9,069
Unclassified [Member] | Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	636,679	575,903
Unclassified [Member] | Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	47,655	48,918
Unclassified [Member] | Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	92,480	90,115
Unclassified [Member] | Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	50,433	50,257
Unclassified [Member] | Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	49,423	50,257
Unclassified [Member] | Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,010
Unclassified [Member] | Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	178,894	185,656
Unclassified [Member] | Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,790	5,507
Unclassified [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	152,467	156,841
Unclassified [Member] | Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	3,932	4,143
Unclassified [Member] | Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	15,715	17,066
Unclassified [Member] | Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,990	2,099
Unclassified [Member] | Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	32,183	19,782
Unclassified [Member] | Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	32,173	19,714
Unclassified [Member] | Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	10	68
Special Mention [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	14,821	15,956
Special Mention [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	12,760	15,715
Special Mention [Member] | Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0	127
Special Mention [Member] | Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,556	404
Special Mention [Member] | Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,599	2,962
Special Mention [Member] | Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	8,605	12,222
Special Mention [Member] | Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Special Mention [Member] | Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Special Mention [Member] | Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Special Mention [Member] | Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	31	51
Special Mention [Member] | Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4	5
Special Mention [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	27	46
Special Mention [Member] | Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Special Mention [Member] | Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Special Mention [Member] | Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Special Mention [Member] | Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,030	190
Special Mention [Member] | Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,030	190
Special Mention [Member] | Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Substandard [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	41,695	53,509
Substandard [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	31,128	40,724
Substandard [Member] | Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	487	487
Substandard [Member] | Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	6,976	8,718
Substandard [Member] | Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,684	2,605
Substandard [Member] | Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	20,981	28,914
Substandard [Member] | Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,551	3,092
Substandard [Member] | Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,551	3,092
Substandard [Member] | Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Substandard [Member] | Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	3,102	3,524
Substandard [Member] | Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	75	116
Substandard [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,589	2,954
Substandard [Member] | Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	156	160
Substandard [Member] | Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	268	281
Substandard [Member] | Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	14	13
Substandard [Member] | Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,914	6,169
Substandard [Member] | Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,798	5,810
Substandard [Member] | Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	116	359
Doubtful [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Doubtful [Member] | Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified Loss [Member] | Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	41,695	53,509
Classified [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	31,128	40,724
Classified [Member] | Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	487	487
Classified [Member] | Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	6,976	8,718
Classified [Member] | Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,684	2,605
Classified [Member] | Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	20,981	28,914
Classified [Member] | Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,551	3,092
Classified [Member] | Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,551	3,092
Classified [Member] | Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	0
Classified [Member] | Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	3,102	3,524
Classified [Member] | Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	75	116
Classified [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,589	2,954
Classified [Member] | Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	156	160
Classified [Member] | Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	268	281
Classified [Member] | Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	14	13
Classified [Member] | Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,914	6,169
Classified [Member] | Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,798	5,810
Classified [Member] | Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	$ 116	$ 359