Loans Receivable - Aging Analysis of Investment of Past Due Loans Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 1,368	$ 1,902
60-89 Days Past Due	672	598
90 Days Or Greater	8,724	8,637
Total Past Due	10,764	11,137
Current	715,807	705,102
Total loans receivable	726,571	716,239
Recorded Investment greater than 90 Days and Accruing
Residential Real Estate, Single Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	633	653
60-89 Days Past Due	475	319
90 Days Or Greater	3,350	3,405
Total Past Due	4,458	4,377
Current	342,765	337,398
Total loans receivable	347,223	341,775
Recorded Investment greater than 90 Days and Accruing
Residential Real Estate, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
90 Days Or Greater
Total Past Due
Current	40,590	44,327
Total loans receivable	40,590	44,327
Recorded Investment greater than 90 Days and Accruing
Residential Real Estate, Multi-Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
90 Days Or Greater
Total Past Due
Current	42,154	37,857
Total loans receivable	42,154	37,857
Recorded Investment greater than 90 Days and Accruing
Commercial Real Estate, Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	105	53
60-89 Days Past Due	7	65
90 Days Or Greater	5,023	4,787
Total Past Due	5,135	4,905
Current	86,175	72,461
Total loans receivable	91,310	77,366
Recorded Investment greater than 90 Days and Accruing
Commercial Real Estate, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
90 Days Or Greater
Total Past Due
Current	10,235	25,971
Total loans receivable	10,235	25,971
Recorded Investment greater than 90 Days and Accruing
Consumer Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	96	156
60-89 Days Past Due	28	65
90 Days Or Greater	124	214
Total Past Due	248	435
Current	84,256	82,552
Total loans receivable	84,504	82,987
Recorded Investment greater than 90 Days and Accruing
Consumer Dealer Auto and RV Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	497	993
60-89 Days Past Due	138	106
90 Days Or Greater	124	136
Total Past Due	759	1,235
Current	48,678	45,267
Total loans receivable	49,437	46,502
Recorded Investment greater than 90 Days and Accruing
Consumer Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	37	47
60-89 Days Past Due	24	43
90 Days Or Greater	75	65
Total Past Due	136	155
Current	5,911	6,498
Total loans receivable	6,047	6,653
Recorded Investment greater than 90 Days and Accruing
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
90 Days Or Greater	28	30
Total Past Due	28	30
Current	55,043	52,771
Total loans receivable	55,071	52,801
Recorded Investment greater than 90 Days and Accruing