Investment Securities Carrying Value (Amortized Cost) and Fair Value by remaining period of contractual maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	$ 4,999
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	$ 4,991
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Rate	1.52%
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	$ 12,122
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	$ 12,108
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate	2.06%
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	$ 39,365
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	$ 39,081
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate	1.50%
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 56,486
Available-for-sale Securities	$ 56,180	$ 100,204	[1],[2]
Available-for-sale Securities, Debt Maturities, Weighted Average Rate	1.63%
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	$ 6,921
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	$ 7,089
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate	3.02%
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	$ 8,390
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	$ 8,564
Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Rate	2.53%
Held-to-maturity Securities	$ 15,311	11,922
Held-to-maturity Securities, Fair Value	$ 15,653	$ 12,231
Held-to-maturity Securities, Debt Maturities, Weighted Average Rate	2.75%

[1] (1) March 31, 2015 and 2014 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[2] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.