Loans - Risk Category of Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	$ 1,080,448	$ 1,049,165	$ 1,080,448
Unclassified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,013,305	979,700
Special Mention [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	14,360	15,956
Substandard [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	52,783	53,509
Doubtful [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Classified Loss [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Classified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	52,783	53,509
Permanent Real Estate Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	800,737	780,444
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	610,879	585,025
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	54,233	54,485
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	125,796	131,251
Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	9,829	9,683
Permanent Real Estate Loans [Member] | Unclassified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	745,854	724,005
Permanent Real Estate Loans [Member] | Unclassified [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	601,575	575,903
Permanent Real Estate Loans [Member] | Unclassified [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	47,764	48,918
Permanent Real Estate Loans [Member] | Unclassified [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	87,295	90,115
Permanent Real Estate Loans [Member] | Unclassified [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	9,220	9,069
Permanent Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	14,131	15,715
Permanent Real Estate Loans [Member] | Special Mention [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,465	404
Permanent Real Estate Loans [Member] | Special Mention [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,266	2,962
Permanent Real Estate Loans [Member] | Special Mention [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	8,278	12,222
Permanent Real Estate Loans [Member] | Special Mention [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	122	127
Permanent Real Estate Loans [Member] | Substandard [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	40,752	40,724
Permanent Real Estate Loans [Member] | Substandard [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	7,839	8,718
Permanent Real Estate Loans [Member] | Substandard [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,203	2,605
Permanent Real Estate Loans [Member] | Substandard [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	30,223	28,914
Permanent Real Estate Loans [Member] | Substandard [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	487	487
Permanent Real Estate Loans [Member] | Doubtful [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Doubtful [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Doubtful [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Doubtful [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Doubtful [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Classified Loss [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Classified Loss [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Classified Loss [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Classified Loss [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Classified Loss [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Permanent Real Estate Loans [Member] | Classified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	40,752	40,724
Permanent Real Estate Loans [Member] | Classified [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	7,839	8,718
Permanent Real Estate Loans [Member] | Classified [Member] | Multi-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,203	2,605
Permanent Real Estate Loans [Member] | Classified [Member] | Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	30,223	28,914
Permanent Real Estate Loans [Member] | Classified [Member] | Land [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	487	487
Construction Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	55,289	53,349
Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	55,082	53,349
Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	207
Construction Loans [Member] | Unclassified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	52,407	50,257
Construction Loans [Member] | Unclassified [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	52,200	50,257
Construction Loans [Member] | Unclassified [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	207
Construction Loans [Member] | Special Mention [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Special Mention [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Special Mention [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Substandard [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,882	3,092
Construction Loans [Member] | Substandard [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,882	3,092
Construction Loans [Member] | Substandard [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Doubtful [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Doubtful [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Doubtful [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Classified Loss [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Classified Loss [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Classified Loss [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Construction Loans [Member] | Classified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,882	3,092
Construction Loans [Member] | Classified [Member] | One-to Four-Family Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	2,882	3,092
Construction Loans [Member] | Classified [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	184,409	189,231
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	156,478	159,795
Consumer Loans [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	5,219	5,669
Consumer Loans [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,217	4,308
Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	16,523	17,347
Consumer Loans [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,972	2,112
Consumer Loans [Member] | Unclassified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	180,950	185,656
Consumer Loans [Member] | Unclassified [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	153,458	156,841
Consumer Loans [Member] | Unclassified [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	5,129	5,507
Consumer Loans [Member] | Unclassified [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4,056	4,143
Consumer Loans [Member] | Unclassified [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	16,352	17,066
Consumer Loans [Member] | Unclassified [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	1,955	2,099
Consumer Loans [Member] | Special Mention [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4	51
Consumer Loans [Member] | Special Mention [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans		46
Consumer Loans [Member] | Special Mention [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans		5
Consumer Loans [Member] | Special Mention [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	4
Consumer Loans [Member] | Special Mention [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Special Mention [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Substandard [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	3,455	3,524
Consumer Loans [Member] | Substandard [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	3,020	2,954
Consumer Loans [Member] | Substandard [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	90	116
Consumer Loans [Member] | Substandard [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	157	160
Consumer Loans [Member] | Substandard [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	171	281
Consumer Loans [Member] | Substandard [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	17	13
Consumer Loans [Member] | Doubtful [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Doubtful [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Doubtful [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Doubtful [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Doubtful [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Doubtful [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Classified Loss [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Classified Loss [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Classified Loss [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Classified Loss [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Classified Loss [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Classified Loss [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Consumer Loans [Member] | Classified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	3,455	3,524
Consumer Loans [Member] | Classified [Member] | Home Equity [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	3,020	2,954
Consumer Loans [Member] | Classified [Member] | Auto [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	90	116
Consumer Loans [Member] | Classified [Member] | Marine [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	157	160
Consumer Loans [Member] | Classified [Member] | Recreational Vehicles [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	171	281
Consumer Loans [Member] | Classified [Member] | Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	17	13
Commercial Loans [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	40,013	26,141
Commercial Loans [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	39,883	25,714
Commercial Loans [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	130	427
Commercial Loans [Member] | Unclassified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	34,094	19,782
Commercial Loans [Member] | Unclassified [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	34,084	19,714
Commercial Loans [Member] | Unclassified [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	10	68
Commercial Loans [Member] | Special Mention [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	225	190
Commercial Loans [Member] | Special Mention [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	225	190
Commercial Loans [Member] | Special Mention [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Commercial Loans [Member] | Substandard [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	5,694	6,169
Commercial Loans [Member] | Substandard [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	5,574	5,810
Commercial Loans [Member] | Substandard [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	120	359
Commercial Loans [Member] | Doubtful [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Commercial Loans [Member] | Doubtful [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Commercial Loans [Member] | Doubtful [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Commercial Loans [Member] | Classified Loss [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Commercial Loans [Member] | Classified Loss [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Commercial Loans [Member] | Classified Loss [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans
Commercial Loans [Member] | Classified [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	5,694	6,169
Commercial Loans [Member] | Classified [Member] | Secured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	5,574	5,810
Commercial Loans [Member] | Classified [Member] | Unsecured [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Total loans	$ 120	$ 359