Investment Securities Investment Securities Unrealized losses and fair value of securities (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Dec. 31, 2015	Mar. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 159
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		12,879
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss		159
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		12,879
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		122	$ 57
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		14,794	12,943
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1,288	1,090
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		52,367	58,499
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,410	1,147
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		67,161	71,442
Securities Continuous Loss Position Less than 12 months		281
Securities Continuous Unrealized Loss Position Less than 12 months Fair Value		27,673
Securities, Continuous Unrealized Loss Position ,12 months or Longer		1,288
Securities, Continuous Unrealized Loss Position, 12 months or Longer, Fair Value		52,367
Unrealized Loss on Securities		1,569	1,147
Securities, Continuous Unrealized Loss Position, fair value		80,040
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		29	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		3,887	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		397	287
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		16,873	22,297
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		426	287
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		20,760	22,297
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		93	57
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		10,907	12,943
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		548	605
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		25,837	26,400
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		641	662
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		36,744	39,343
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]	343	198
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[1]	9,657	9,802
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	343	198
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[1]	9,657	$ 9,802
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		149
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		11,889
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss		149
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		11,889
Corporate Bond Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		10
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		990
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss		10
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		$ 990

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