Loans - Presentation of Age Analysis of Past-Due Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	$ 3,333	$ 2,518
60-89 Days Past Due	2,031	1,084
Greater than 90 Days Past Due	18,114	20,233
Total Past Due	23,478	23,835
Current Loans	1,113,713	1,025,330
Ending balance	1,137,191	1,049,165
Permanent Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	2,254	1,854
60-89 Days Past Due	873	415
Greater than 90 Days Past Due	10,290	10,829
Total Past Due	13,417	13,098
Current Loans	845,045	767,346
Ending balance	858,462	780,444
Construction Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Greater than 90 Days Past Due	2,453	3,084
Total Past Due	2,453	3,084
Current Loans	54,949	50,265
Ending balance	57,402	53,349
Consumer Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	1,079	664
60-89 Days Past Due	1,158	658
Greater than 90 Days Past Due	1,227	2,173
Total Past Due	3,464	3,495
Current Loans	178,010	185,736
Ending balance	181,474	189,231
Commercial Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
60-89 Days Past Due		11
Greater than 90 Days Past Due	4,144	4,147
Total Past Due	4,144	4,158
Current Loans	35,709	21,983
Ending balance	39,853	26,141
Land [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
60-89 Days Past Due		36
Greater than 90 Days Past Due	530	496
Total Past Due	530	532
Current Loans	8,957	9,151
Ending balance	9,487	9,683
Auto [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	7	5
60-89 Days Past Due	6
Greater than 90 Days Past Due	27	49
Total Past Due	40	54
Current Loans	5,260	5,615
Ending balance	5,300	5,669
Home Equity [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	463	541
60-89 Days Past Due	544	452
Greater than 90 Days Past Due	1,181	2,111
Total Past Due	2,188	3,104
Current Loans	152,748	156,691
Ending balance	154,936	159,795
One-to Four-Family Residential [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	2,021	1,482
60-89 Days Past Due	873	379
Greater than 90 Days Past Due	2,873	4,687
Total Past Due	5,767	6,548
Current Loans	663,503	578,477
Ending balance	669,270	585,025
One-to Four-Family Residential [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Ending balance	52,735	53,349
Multi-Family Residential [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	233	359
Greater than 90 Days Past Due	114	190
Total Past Due	347	549
Current Loans	56,098	53,936
Ending balance	56,445	54,485
Nonresidential [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due		13
Greater than 90 Days Past Due	6,773	5,456
Total Past Due	6,773	5,469
Current Loans	116,487	125,782
Ending balance	123,260	131,251
One-to Four-Family Residential [Member] | Permanent Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Ending balance	669,270	585,025
One-to Four-Family Residential [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Greater than 90 Days Past Due	2,453	3,084
Total Past Due	2,453	3,084
Current Loans	50,282	50,265
Ending balance	52,735	53,349
Multi-Family and Nonresidential [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Current Loans	4,667
Ending balance	4,667
Marine [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
60-89 Days Past Due	381
Total Past Due	381
Current Loans	3,622	4,308
Ending balance	4,003	4,308
Recreational Vehicles [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	606	117
60-89 Days Past Due	221	199
Greater than 90 Days Past Due	19	3
Total Past Due	846	319
Current Loans	14,403	17,028
Ending balance	15,249	17,347
Other [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
30-59 Days Past Due	3	1
60-89 Days Past Due	6	7
Greater than 90 Days Past Due		10
Total Past Due	9	18
Current Loans	1,977	2,094
Ending balance	1,986	2,112
Secured [Member] | Commercial Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
60-89 Days Past Due		11
Greater than 90 Days Past Due	4,019	4,017
Total Past Due	4,019	4,028
Current Loans	35,666	21,686
Ending balance	39,685	25,714
Unsecured [Member] | Commercial Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Greater than 90 Days Past Due	125	130
Total Past Due	125	130
Current Loans	43	297
Ending balance	$ 168	$ 427