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Investment Securities: Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses (Details) - Investments - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016
Trust preferred |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |  |  | 1,808 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  |  |  | (111) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |  |  | 1,808 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  |  |  | (111) |
Agency securities |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 4,989 |  | 5,508 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | (10) |  | (6) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |  |  | 4,991 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  |  |  | (8) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 4,989 |  | 10,499 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | (10) |  | (14) |
Mortgage-backed |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] | 2,936 |  | 831 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | [1] | (2) |  | (10) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] | 709 |  | 3,051 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | [1] | (13) |  | (21) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [1] | 3,645 |  | 3,882 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | [1] | (15) |  | (31) |
Real estate mortgage investment conduits |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [2] |  |  | 1,636 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | [2] |  |  | (1) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [2] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | [2] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [2] |  |  | 1,636 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | [2] |  |  | (1) |
Other mortgage-backed securities |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 3,872 | [3] | 1,891 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | (23) | [3] | (6) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,126 | [3] | 1,229 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | (20) | [3] | (18) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 4,998 | [3] | 3,120 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | (43) | [3] | (24) |
Investment |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 11,797 |  | 9,866 | [3]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | (35) |  | (23) | [3]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,835 |  | 11,079 | [3]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | (33) |  | (158) | [3]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 13,632 |  | 20,945 | [3]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | $ (68) |  | $ (181) | [3]
[1] | Comprised of FHLMC and FNMA issued securities.
[2] | Comprised of FHLMC securities.
[3] | Comprised of SBA issued securities.

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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