Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($) $ in Thousands		Dec. 31, 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		$ 197	$ 181
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		44,708	11,368
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1,690	2,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		37,978	48,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,887	2,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		82,686	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		0	101
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0	3,702
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		1,324	1,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		27,011	28,124
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,324	1,607
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		27,011	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		0	188
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		0	7,681
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		202	59
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		8,802	1,612
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		202	247
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		8,802	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		160	80
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		28,368	7,666
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		162	178
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6,111	6,566
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		322	258
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		34,479	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		37
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		16,340
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		37
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		16,340
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		204	212
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		4,856	4,866
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		204	212
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		$ 4,856	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.