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Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 29 | $ 1,403
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 3,819 | 47,162
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 1,708 | 537
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 50,877 | 11,446
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 1,737 | 1,940
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 54,696 | 58,608
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 35 | 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 7,968 | 7,623
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 37 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,728 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 72 | 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value |  | 9,696 | 7,623
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 | 1,171
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 3,819 | 34,716
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 992 | 41
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 29,556 | 1,942
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 1,021 | 1,212
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 33,375 | 36,658
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 |  | 0 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 0 | 7,482
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 124 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 6,828 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 124 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 6,828 | 7,482
Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0 | 140
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 0 | 4,964
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 96 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 4,989 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 96 | 140
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 4,989 | 4,964
Other investments |  |  |
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] | 496 | 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] | 9,504 | 9,504
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | [1] | 496 | 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [1] | 9,504 | 9,504
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 |  | 35 | 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 7,968 | 7,623
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 37 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,728 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 72 | 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 9,696 | $ 7,623
[1] | (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.

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