Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 318	$ 181
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		27,429	11,368
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		2,025	2,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		38,399	48,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		2,343	2,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		65,828	60,275
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			188
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value			7,681
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			59
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value			1,612
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss			247
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value			9,293
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		138	101
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		3,614	3,702
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1,585	1,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		27,026	28,124
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,723	1,607
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		30,640	31,826
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		252	188
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		7,505	7,681
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		62	59
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		1,569	1,612
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		314	247
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		9,074	9,293
US Government Agency Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		134	80
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		7,543	7,666
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		217	178
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6,524	6,566
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		351	258
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		14,067	14,232
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		46
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		16,272
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		46
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		16,272
Corporate Bonds
Debt Securities, Available-for-sale [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		223	212
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		4,849	4,866
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		223	212
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		$ 4,849	4,866
Other investments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[1]		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[1]		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[1]		649
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[1]		9,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]		649
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	[1]		$ 9,351

[1] (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.