Investment Securities Unrealized losses and fair value of securities (Details) - USD ($) $ in Thousands		Mar. 31, 2016	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		$ 3	$ 57
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		2,996	12,943
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		375	1,090
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		36,537	58,499
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		378	1,147
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		39,533	71,442
Mortgage Backed Securities [Member]
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		136	287
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		15,502	22,297
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		136	287
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		15,502	22,297
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		3	57
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		2,996	12,943
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		32	605
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		11,242	26,400
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		35	662
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		14,238	39,343
Other [Member]
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]	207	198
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[1]	9,793	9,802
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	207	198
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[1]	$ 9,793	$ 9,802

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