Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($) $ in Thousands		Sep. 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		$ 420	$ 181
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		54,023	11,368
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		2,271	2,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		38,172	48,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		2,691	2,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		92,195	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		166	101
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		19,708	3,702
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1,829	1,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		27,273	28,124
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,995	1,607
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		46,981	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		229	188
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		5,486	7,681
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		132	59
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		3,315	1,612
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		361	247
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		8,801	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		176	80
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		18,046	7,666
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		237	178
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6,038	6,566
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		413	258
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		24,084	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		78
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		16,269
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		78
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		16,269
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		205	212
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		4,861	4,866
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		205	212
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		$ 4,861	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.