Capital Ratios and Minimum Capital Requirements of Bank (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Mar. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), actual amount	$ 43,238		$ 45,800
Tier 1 capital (to risk-weighted assets), actual amount	42,000		44,014
Tier 1 capital (to adjusted total assets), actual amount	42,000		44,014
Total capital (to risk-weighted assets), actual ratio	26.31%		28.38%
Tier 1 capital (to risk-weighted assets), actual ratio	25.07%		27.28%
Tier 1 capital (to adjusted total assets), actual ratio	14.64%		15.10%
Total capital (to risk-weighted assets), minimum capital requirement amount	13,146		12,908
Tier 1 capital (to risk-weighted assets), minimum capital requirement amount	6,573		6,454
Tier 1 capital (to adjusted total assets), minimum capital requirement amount	11,257		11,660
Total capital (to risk-weighted assets), minimum capital requirement ratio	8.00%		8.00%
Tier 1 capital (to risk-weighted assets), minimum capital requirement Ratio	4.00%		4.00%
Tangible capital (to adjusted total assets), minimum capital requirement ratio	4.00%		4.00%
Total capital (to risk-weighted assets), to be well capitalized amount	16,433	[1]	16,135	[1]
Tier 1 capital (to risk-weighted assets), to be well capitalized amount	9,860	[1]	9,681	[1]
Tier 1 capital (to adjusted total assets), to be well capitalized amount	$ 14,071	[1]	$ 14,575	[1]
Total capital (to risk-weighted assets), to be well capitalized ratio	10.00%	[1]	10.00%	[1]
Tier 1 capital (to risk-weighted assets), to be well capitalized ratio	6.00%	[1]	6.00%	[1]
Tier 1 capital (to adjusted total assets), to be well capitalized ratio	5.00%	[1]	5.00%	[1]

[1] Under prompt corrective action provision.