Variable Interest Entities Text Tag (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2013	Mar. 31, 2016		Sep. 30, 2011	Dec. 31, 2010	Dec. 30, 2010	May 15, 2009	Mar. 31, 2008	Apr. 28, 2006
Entity Information [Line Items]
Variable Interest Entity, Funded Exposure, Debt Investment			$ 13,000
Variable Interest Entity, Funded Exposure, Equity Invesment			0
% of Carver Statutory Trust I owned		100.00%
Cash							$ 6,700
New Markets Tax Credit Award					$ 25,000			$ 65,000		$ 59,000
Variable Interest Entity, Rights Transferred			149,000					$ 40,000
Carver Statutory Trust 1 [Member]
Entity Information [Line Items]
Variable Interest Entity, Funded Exposure, Debt Investment		$ 13,000	13,000
Variable Interest Entity, Funded Exposure, Equity Invesment		$ 400	400
Variable Interest Entity, Rights Transferred			0
CDE 10 [Member]
Entity Information [Line Items]
Variable Interest Entity, Funded Exposure, Debt Investment	[1]		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]		0
Variable Interest Entity, Rights Transferred			19,000	[1]					$ 19,000
CDE 1-9, CDE 11-12 [Member]
Entity Information [Line Items]
Variable Interest Entity, Funded Exposure, Debt Investment	[2]		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[2],[3]		0
Variable Interest Entity, Rights Transferred	[2]		$ 40,000
Stockholders' Equity Attributable to Noncontrolling Interest						$ 6,700

[1] (2) Entity dissolved May 2015.

[2] (3) CDEs 2-9, 11-12 dissolved March 2016.

[3] (1) Excludes any proceeds realized from exchange of equity interest in CDEs as detailed below.