Loans - Presentation of Loans Individually Evaluated for Impairment by Class (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	$ 29,715	$ 45,671	$ 29,715	$ 45,671	$ 41,393
With no specific allowance recorded, Recorded Investment	17,464	33,197	17,464	33,197	28,965
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	16,322	37,751	19,769	41,142
With no specific allowance recorded, Interest Income Recognized	43	243	56	658
With no specific allowance recorded, Cash Basis Income Recognized	113	350	300	887
With a specific allowance recorded, Unpaid Principal Balance	31,927	15,118	31,927	15,118	21,284
With a specific allowance recorded, Recorded Investment	29,815	13,130	29,815	13,130	19,216
With a specific allowance recorded, Allowance for Loan Losses Allocated	3,632	2,423	3,632	2,423	3,325
With a specific allowance recorded, Average Recorded Investment	31,265	8,871	27,891	12,580
With a specific allowance recorded, Interest Income Recognized	266	141	587	275
With a specific allowance recorded, Cash Basis Income Recognized	267	142	595	287
Total Unpaid Principal Balance	61,642	60,789	61,642	60,789	62,677
Total Recorded Investment	47,279	46,327	47,279	46,327	48,181
Total Allowance for Loan Losses Allocated	3,632	2,423	3,632	2,423	3,325
Total Average Recorded Investment	47,587	46,622	47,660	53,722
Total Interest Income, Accrual Method	309	384	643	933
Total Cash Basis Income Recognized	380	492	895	1,174
Permanent Real Estate Loans [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	17,143	25,717	17,143	25,717	24,347
With no specific allowance recorded, Recorded Investment	10,599	18,826	10,599	18,826	17,674
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	9,626	21,386	11,882	26,183
With no specific allowance recorded, Interest Income Recognized	23	130	43	347
With no specific allowance recorded, Cash Basis Income Recognized	61	189	170	438
With a specific allowance recorded, Unpaid Principal Balance	17,763	7,805	17,763	7,805	9,990
With a specific allowance recorded, Recorded Investment	17,273	7,433	17,273	7,433	9,550
With a specific allowance recorded, Allowance for Loan Losses Allocated	2,368	1,222	2,368	1,222	1,786
With a specific allowance recorded, Average Recorded Investment	17,713	4,762	15,562	8,523
With a specific allowance recorded, Interest Income Recognized	137	98	335	192
With a specific allowance recorded, Cash Basis Income Recognized	140	99	341	201
Total Recorded Investment	27,871		27,871		27,224
Permanent Real Estate Loans [Member] | Land [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	3,958	3,913	3,958	3,913	3,913
With no specific allowance recorded, Recorded Investment	532	487	532	487	487
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	510	487	510	2,120
With a specific allowance recorded, Average Recorded Investment				1,064
Permanent Real Estate Loans [Member] | One-to Four-Family Residential [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	7,592	14,867	7,592	14,867	13,321
With no specific allowance recorded, Recorded Investment	6,177	12,469	6,177	12,469	11,309
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	5,226	14,977	6,985	16,088
With no specific allowance recorded, Interest Income Recognized	19	128	43	333
With no specific allowance recorded, Cash Basis Income Recognized	50	165	147	385
With a specific allowance recorded, Unpaid Principal Balance	13,980	6,670	13,980	6,670	8,897
With a specific allowance recorded, Recorded Investment	13,980	6,665	13,980	6,665	8,897
With a specific allowance recorded, Allowance for Loan Losses Allocated	2,113	1,092	2,113	1,092	1,675
With a specific allowance recorded, Average Recorded Investment	15,742	3,338	13,590	2,036
With a specific allowance recorded, Interest Income Recognized	137	98	284	192
With a specific allowance recorded, Cash Basis Income Recognized	137	98	285	193
Permanent Real Estate Loans [Member] | Multi-Family Residential [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	185	737	185	737	662
With no specific allowance recorded, Recorded Investment	86	643	86	643	567
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	88	652	207	766
With no specific allowance recorded, Interest Income Recognized				2
With no specific allowance recorded, Cash Basis Income Recognized		4		9
With a specific allowance recorded, Unpaid Principal Balance	54	185	54	185	185
With a specific allowance recorded, Recorded Investment	29	85	29	85	85
With a specific allowance recorded, Allowance for Loan Losses Allocated	6	25	6	25	25
With a specific allowance recorded, Average Recorded Investment	567	85	312	554
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	5,408	6,380	5,408	6,380	6,451
With no specific allowance recorded, Recorded Investment	3,804	5,227	3,804	5,227	5,311
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	3,802	5,270	4,180	7,209
With no specific allowance recorded, Interest Income Recognized	4	2		12
With no specific allowance recorded, Cash Basis Income Recognized	11	20	23	44
With a specific allowance recorded, Unpaid Principal Balance	3,729	950	3,729	950	908
With a specific allowance recorded, Recorded Investment	3,264	683	3,264	683	568
With a specific allowance recorded, Allowance for Loan Losses Allocated	249	105	249	105	86
With a specific allowance recorded, Average Recorded Investment	1,404	1,339	1,660	4,869
With a specific allowance recorded, Interest Income Recognized			51
With a specific allowance recorded, Cash Basis Income Recognized	3	1	56	8
Construction Loans [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	1,741	1,501	1,741	1,501	1,433
With no specific allowance recorded, Recorded Investment	639	1,092	639	1,092	825
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	690	1,587	711	2,070
With no specific allowance recorded, Cash Basis Income Recognized				2
With a specific allowance recorded, Unpaid Principal Balance	3,436	3,829	3,436	3,829	3,895
With a specific allowance recorded, Recorded Investment	1,814	2,241	1,814	2,241	2,267
With a specific allowance recorded, Allowance for Loan Losses Allocated	203	677	203	677	680
With a specific allowance recorded, Average Recorded Investment	2,026	2,279	2,033	2,984
Total Recorded Investment	2,453		2,453		3,092
Construction Loans [Member] | One-to Four-Family Residential [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	1,741	1,501	1,741	1,501	1,433
With no specific allowance recorded, Recorded Investment	639	1,092	639	1,092	825
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	690	1,587	711	2,070
With no specific allowance recorded, Cash Basis Income Recognized				2
With a specific allowance recorded, Unpaid Principal Balance	3,436	3,829	3,436	3,829	3,895
With a specific allowance recorded, Recorded Investment	1,814	2,241	1,814	2,241	2,267
With a specific allowance recorded, Allowance for Loan Losses Allocated	203	677	203	677	680
With a specific allowance recorded, Average Recorded Investment	2,026	2,279	2,033	2,984
Construction Loans [Member] | Multi-Family and Nonresidential [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
Consumer Loans [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	3,251	9,555	3,251	9,555	7,132
With no specific allowance recorded, Recorded Investment	2,522	8,951	2,522	8,951	6,422
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	2,296	10,357	3,384	9,903
With no specific allowance recorded, Interest Income Recognized	20	113	13	310
With no specific allowance recorded, Cash Basis Income Recognized	29	125	71	350
With a specific allowance recorded, Unpaid Principal Balance	10,404	3,484	10,404	3,484	7,399
With a specific allowance recorded, Recorded Investment	10,404	3,456	10,404	3,456	7,399
With a specific allowance recorded, Allowance for Loan Losses Allocated	1,058	524	1,058	524	859
With a specific allowance recorded, Average Recorded Investment	11,202	1,728	10,053	865
With a specific allowance recorded, Interest Income Recognized	129	43	252	83
With a specific allowance recorded, Cash Basis Income Recognized	127	43	254	86
Total Recorded Investment	12,926		12,926		13,821
Consumer Loans [Member] | Auto [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	105	50	105	50	83
With no specific allowance recorded, Recorded Investment	96	33	96	33	66
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	65	39	73	40
With no specific allowance recorded, Interest Income Recognized			1	1
With no specific allowance recorded, Cash Basis Income Recognized	1	1	5	3
With a specific allowance recorded, Unpaid Principal Balance	7		7
With a specific allowance recorded, Recorded Investment	7		7
With a specific allowance recorded, Average Recorded Investment	9		6
Consumer Loans [Member] | Home Equity [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	2,622	9,073	2,622	9,073	6,458
With no specific allowance recorded, Recorded Investment	2,015	8,511	2,015	8,511	5,808
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	1,875	9,467	2,893	8,942
With no specific allowance recorded, Interest Income Recognized	19	109	8	300
With no specific allowance recorded, Cash Basis Income Recognized	22	116	53	328
With a specific allowance recorded, Unpaid Principal Balance	9,654	2,728	9,654	2,728	6,743
With a specific allowance recorded, Recorded Investment	9,654	2,728	9,654	2,728	6,743
With a specific allowance recorded, Allowance for Loan Losses Allocated	917	365	917	365	719
With a specific allowance recorded, Average Recorded Investment	10,399	1,364	9,300	683
With a specific allowance recorded, Interest Income Recognized	123	38	241	69
With a specific allowance recorded, Cash Basis Income Recognized	121	38	243	72
Consumer Loans [Member] | Marine [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	154	162	154	162	160
With no specific allowance recorded, Recorded Investment	154	162	154	162	160
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	157	174	157	182
With no specific allowance recorded, Cash Basis Income Recognized	2	2	5	7
Consumer Loans [Member] | Recreational Vehicles [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	365	270	365	270	429
With no specific allowance recorded, Recorded Investment	252	245	252	245	386
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	195	677	257	737
With no specific allowance recorded, Interest Income Recognized	1	4	4	9
With no specific allowance recorded, Cash Basis Income Recognized	4	6	8	12
With a specific allowance recorded, Unpaid Principal Balance	743	756	743	756	656
With a specific allowance recorded, Recorded Investment	743	728	743	728	656
With a specific allowance recorded, Allowance for Loan Losses Allocated	141	159	141	159	140
With a specific allowance recorded, Average Recorded Investment	794	364	747	182
With a specific allowance recorded, Interest Income Recognized	6	5	11	14
With a specific allowance recorded, Cash Basis Income Recognized	6	5	11	14
Consumer Loans [Member] | Other [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	5		5		2
With no specific allowance recorded, Recorded Investment	5		5		2
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	4		4	2
Commercial Loans [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	7,580	8,898	7,580	8,898	8,481
With no specific allowance recorded, Recorded Investment	3,704	4,328	3,704	4,328	4,044
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	3,710	4,421	3,792	2,986
With no specific allowance recorded, Interest Income Recognized				1
With no specific allowance recorded, Cash Basis Income Recognized	23	36	59	97
With a specific allowance recorded, Unpaid Principal Balance	324		324
With a specific allowance recorded, Recorded Investment	324		324
With a specific allowance recorded, Allowance for Loan Losses Allocated	3		3
With a specific allowance recorded, Average Recorded Investment	324	102	243	208
Commercial Loans [Member] | Secured [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	3,929	4,701	3,929	4,701	4,414
With no specific allowance recorded, Recorded Investment	3,704	4,328	3,704	4,328	4,044
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment	3,710	4,420	3,792	2,798
With no specific allowance recorded, Cash Basis Income Recognized	1	8	2	41
With a specific allowance recorded, Unpaid Principal Balance	324		324
With a specific allowance recorded, Recorded Investment	324		324
With a specific allowance recorded, Allowance for Loan Losses Allocated	3		3
With a specific allowance recorded, Average Recorded Investment	324	102	243	208
Commercial Loans [Member] | Unsecured [Member]
Schedule Of Financial Receivables [Line Items]
With no specific allowance recorded, Unpaid Principal Balance	3,651	4,197	3,651	4,197	4,067
With no specific allowance recorded, Allowance for Loan Losses Allocated	0	0	0	0	0
With no specific allowance recorded, Average Recorded Investment		1		188
With no specific allowance recorded, Interest Income Recognized				1
With no specific allowance recorded, Cash Basis Income Recognized	$ 22	$ 28	$ 57	$ 56