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Investment Securities: Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 9,866 | $ 1,323
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | (23) | (1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 11,079 | 21,220
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | (158) | (286)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 20,945 | 22,543
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | (181) | (287)
Trust preferred |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,808 | 1,812
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | (111) | (107)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 1,808 | 1,812
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | (111) | (107)
US Government Agencies Debt Securities |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 5,508 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | (6) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 4,991 | 12,893
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | (8) | (107)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 10,499 | 12,893
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | (14) | (107)
Real estate mortgage investment conduits |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] | 1,636 | 1,323
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | [1] | (1) | (1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [1] | 1,636 | 1,323
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | [1] | (1) | (1)
Mortgage-backed |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [2] | 831 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | [2] | (10) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [2] | 3,051 | 5,098
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | [2] | (21) | (60)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [2] | 3,882 | 5,098
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | [2] | (31) | (60)
Other mortgage-backed securities |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [3] | 1,891 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | [3] | (6) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [3] | 1,229 | 1,417
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | [3] | (18) | (12)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [3] | 3,120 | 1,417
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | [3] | $ (24) | $ (12)
[1] | Comprised of FHLMC issued securities.
[2] | Comprised of FHLMC and FNMA issued 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=27724398&loc=d3e27290-111563 + Details
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