Loans - Presentation of Age Analysis of Past-Due Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 2,434	$ 3,923
60-89 Days Past Due	1,114	2,203
Greater than 90 Days Past Due	24,359	42,056
Total Past Due	27,907	48,182
Current Loans	1,001,028	1,037,974
Ending balance	1,028,935	1,086,156
Permanent Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,537	2,236
60-89 Days Past Due	467	960
Greater than 90 Days Past Due	14,164	32,111
Total Past Due	16,168	35,307
Current Loans	752,564	776,861
Ending balance	768,732	812,168
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,292	1,995
60-89 Days Past Due	405	784
Greater than 90 Days Past Due	4,471	4,495
Total Past Due	6,168	7,274
Current Loans	569,623	569,975
Ending balance	575,791	577,249
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	112	158
60-89 Days Past Due
Greater than 90 Days Past Due	240	1,630
Total Past Due	352	1,788
Current Loans	55,344	79,135
Ending balance	55,696	80,923
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	133
60-89 Days Past Due	18	176
Greater than 90 Days Past Due	8,826	19,942
Total Past Due	8,977	20,118
Current Loans	118,722	118,070
Ending balance	127,699	138,188
Permanent Real Estate Loans [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		83
60-89 Days Past Due	44
Greater than 90 Days Past Due	627	6,044
Total Past Due	671	6,127
Current Loans	8,875	9,681
Ending balance	9,546	15,808
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		54
60-89 Days Past Due	49
Greater than 90 Days Past Due	3,320	7,398
Total Past Due	3,369	7,452
Current Loans	35,563	25,400
Ending balance	38,932	32,852
Construction Loans [Member] | One-to Four-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		54
60-89 Days Past Due	49
Greater than 90 Days Past Due	3,320	7,398
Total Past Due	3,369	7,452
Current Loans	30,411	20,866
Ending balance	33,780	28,318
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	5,152	4,534
Ending balance	5,152	4,534
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	897	1,617
60-89 Days Past Due	598	515
Greater than 90 Days Past Due	2,718	2,518
Total Past Due	4,213	4,650
Current Loans	190,170	209,943
Ending balance	194,383	214,593
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	517	1,135
60-89 Days Past Due	427	475
Greater than 90 Days Past Due	2,587	2,071
Total Past Due	3,531	3,681
Current Loans	160,335	173,549
Ending balance	163,866	177,230
Consumer Loans [Member] | Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	16	35
60-89 Days Past Due		7
Greater than 90 Days Past Due	53	83
Total Past Due	69	125
Current Loans	5,874	7,523
Ending balance	5,943	7,648
Consumer Loans [Member] | Marine [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due	41
Greater than 90 Days Past Due		8
Total Past Due	41	8
Current Loans	4,391	4,934
Ending balance	4,432	4,942
Consumer Loans [Member] | Recreational Vehicles [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	342	447
60-89 Days Past Due	129	32
Greater than 90 Days Past Due	76	353
Total Past Due	547	832
Current Loans	17,392	21,418
Ending balance	17,939	22,250
Consumer Loans [Member] | Others [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	22
60-89 Days Past Due	1	1
Greater than 90 Days Past Due	2	3
Total Past Due	25	4
Current Loans	2,178	2,519
Ending balance	2,203	2,523
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		16
60-89 Days Past Due		728
Greater than 90 Days Past Due	4,157	29
Total Past Due	4,157	773
Current Loans	22,731	25,770
Ending balance	26,888	26,543
Commercial Loans [Member] | Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		16
60-89 Days Past Due
Greater than 90 Days Past Due	4,016	23
Total Past Due	4,016	39
Current Loans	22,097	24,204
Ending balance	26,113	24,243
Commercial Loans [Member] | Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due		728
Greater than 90 Days Past Due	141	6
Total Past Due	141	734
Current Loans	634	1,566
Ending balance	$ 775	$ 2,300