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Mortgage-backed Securities: Schedule of Temporarily Impaired Mortgage-backed securities, Fair Value and Unrealized Losses (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Real estate mortgage investment conduits
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 18,852 $ 4,996
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (82) (77)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 18,852 4,996
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (82) (77)
Mortgage-backed
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 31,596 [1] 49,177
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (110) [1] (547)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,221 [1]  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (212) [1]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 36,817 [1] 49,177
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (322) [1] (547)
Other mortgage-backed securities
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 757 [2] 1,526
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (7) [2] (13)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 708 [2]  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (6) [2]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,465 [2] 1,526
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (13) [2] (13)
Total Real Estate mortgage investment conduits and mortgage-backed securities
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 51,205 55,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (199) (637)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,929  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (218)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 57,134 55,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses $ (417) $ (637)
[1] Comprised of FHLMC and FNMA issued securities.
[2] Comprised of SBA issued securities.