Investment Securities Investment Securities Unrealized losses and fair value of securities (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 2	$ 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		2,998	2,996
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		188	375
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		15,749	36,537
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		190	378
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		18,747	39,533
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		44	136
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		5,893	15,502
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		44	136
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		5,893	15,502
US Government Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		2	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		2,998	2,996
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0	32
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0	11,242
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		2	35
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		2,998	14,238
Other
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[1]	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[1]	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[1]	144	207
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[1]	9,856	9,793
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	144	207
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[1]	$ 9,856	$ 9,793

[1] (1) CRA fund comprised of over 95% agency securities.