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Investment Securities Investment Securities-Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity |  | $ 11,545 | $ 12,075
Held-to-maturity, Gross Unrealized Gains |  | 42 | 81
Held-to-maturity, Gross Unrealized Losses |  | 361 | 247
Held-to-maturity, Fair Value |  | 11,226 | 11,909
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 94,886 | 63,435
Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Available-for-sale, Gross Unrealized Losses |  | 2,691 | 2,726
Available-for-sale, Fair Value |  | 92,195 | 60,709
Government National Mortgage Association (GNMA) |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity |  | 1,288 | 1,434
Held-to-maturity, Gross Unrealized Gains |  | 30 | 51
Held-to-maturity, Gross Unrealized Losses |  | 0 | 0
Held-to-maturity, Fair Value |  | 1,318 | 1,485
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 4,791 | 2,163
Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Available-for-sale, Gross Unrealized Losses |  | 190 | 97
Available-for-sale, Fair Value |  | 4,601 | 2,066
Federal Home Loan Mortgage Corporation (FHLMC) |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 15,830 | 6,633
Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Available-for-sale, Gross Unrealized Losses |  | 397 | 283
Available-for-sale, Fair Value |  | 15,433 | 6,350
Federal National Mortgage Association (FNMA) |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity |  | 9,257 | 9,641
Held-to-maturity, Gross Unrealized Gains |  | 0 | 0
Held-to-maturity, Gross Unrealized Losses |  | 361 | 247
Held-to-maturity, Fair Value |  | 8,896 | 9,394
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 28,355 | 24,638
Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Available-for-sale, Gross Unrealized Losses |  | 1,408 | 1,227
Available-for-sale, Fair Value |  | 26,947 | 23,411
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity |  | 10,545 | 11,075
Held-to-maturity, Gross Unrealized Gains |  | 30 | 51
Held-to-maturity, Gross Unrealized Losses |  | 361 | 247
Held-to-maturity, Fair Value |  | 10,214 | 10,879
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 48,976 | 33,434
Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Available-for-sale, Gross Unrealized Losses |  | 1,995 | 1,607
Available-for-sale, Fair Value |  | 46,981 | 31,827
US Government Agency Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 24,497 | 14,490
Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Available-for-sale, Gross Unrealized Losses |  | 413 | 258
Available-for-sale, Fair Value |  | 24,084 | 14,232
US Treasury Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 16,347 |
Available-for-sale, Gross Unrealized Gains |  | 0 |
Available-for-sale, Gross Unrealized Losses |  | 78 |
Available-for-sale, Fair Value |  | 16,269 |
Corporate Bonds |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity |  | 1,000 | 1,000
Held-to-maturity, Gross Unrealized Gains |  | 12 | 30
Held-to-maturity, Gross Unrealized Losses |  | 0 | 0
Held-to-maturity, Fair Value |  | 1,012 | 1,030
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost |  | 5,066 | 5,078
Available-for-sale, Gross Unrealized Gains |  | 0 | 0
Available-for-sale, Gross Unrealized Losses |  | 205 | 212
Available-for-sale, Fair Value |  | $ 4,861 | 4,866
Other investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale, Amortized Cost | [1] |  | 10,433
Available-for-sale, Gross Unrealized Gains | [1] |  | 0
Available-for-sale, Gross Unrealized Losses | [1] |  | 649
Available-for-sale, Fair Value | [1] |  | $ 9,784
[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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