Loans - Presentation of Age Analysis of Past-Due Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 2,549	$ 2,518
60-89 Days Past Due	733	1,084
Greater than 90 Days Past Due	18,709	20,233
Total Past Due	21,991	23,835
Current Loans	1,058,457	1,025,330
Ending balance	1,080,448	1,049,165	1,080,448
Permanent Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,235	1,854
60-89 Days Past Due	401	415
Greater than 90 Days Past Due	9,758	10,829
Total Past Due	11,394	13,098
Current Loans	789,343	767,346
Ending balance	800,737	780,444
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	765	1,482
60-89 Days Past Due	401	379
Greater than 90 Days Past Due	4,105	4,687
Total Past Due	5,271	6,548
Current Loans	605,608	578,477
Ending balance	610,879	585,025
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	460	359
60-89 Days Past Due
Greater than 90 Days Past Due	159	190
Total Past Due	619	549
Current Loans	53,614	53,936
Ending balance	54,233	54,485
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	10	13
60-89 Days Past Due
Greater than 90 Days Past Due	4,962	5,456
Total Past Due	4,972	5,469
Current Loans	120,824	125,782
Ending balance	125,796	131,251
Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due		36
Greater than 90 Days Past Due	532	496
Total Past Due	532	532
Current Loans	9,297	9,151
Ending balance	9,829	9,683
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days Past Due	2,884	3,084
Total Past Due	2,884	3,084
Current Loans	52,405	50,265
Ending balance	55,289	53,349
Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
Greater than 90 Days Past Due	2,884	3,084
Total Past Due	2,884	3,084
Current Loans	52,198	50,265
Ending balance	55,082	53,349
Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
Greater than 90 Days Past Due
Total Past Due
Current Loans	207
Ending balance	207
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,290	664
60-89 Days Past Due	322	658
Greater than 90 Days Past Due	1,923	2,173
Total Past Due	3,535	3,495
Current Loans	180,874	185,736
Ending balance	184,409	189,231
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	375	541
60-89 Days Past Due	143	452
Greater than 90 Days Past Due	1,829	2,111
Total Past Due	2,347	3,104
Current Loans	154,131	156,691
Ending balance	156,478	159,795
Consumer Loans [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		5
60-89 Days Past Due
Greater than 90 Days Past Due	33	49
Total Past Due	33	54
Current Loans	5,186	5,615
Ending balance	5,219	5,669
Consumer Loans [Member] | Marine [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	61
60-89 Days Past Due
Greater than 90 Days Past Due
Total Past Due	61
Current Loans	4,156	4,308
Ending balance	4,217	4,308
Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	849	117
60-89 Days Past Due	170	199
Greater than 90 Days Past Due	54	3
Total Past Due	1,073	319
Current Loans	15,450	17,028
Ending balance	16,523	17,347
Consumer Loans [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	5	1
60-89 Days Past Due	9	7
Greater than 90 Days Past Due	7	10
Total Past Due	21	18
Current Loans	1,951	2,094
Ending balance	1,972	2,112
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	24
60-89 Days Past Due	10	11
Greater than 90 Days Past Due	4,144	4,147
Total Past Due	4,178	4,158
Current Loans	35,835	21,983
Ending balance	40,013	26,141
Commercial Loans [Member] | Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due	10	11
Greater than 90 Days Past Due	4,015	4,017
Total Past Due	4,025	4,028
Current Loans	35,858	21,686
Ending balance	39,883	25,714
Commercial Loans [Member] | Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	24
60-89 Days Past Due
Greater than 90 Days Past Due	129	130
Total Past Due	153	130
Current Loans	(23)	297
Ending balance	$ 130	$ 427