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Investment Securities (Tables) | 6 Months Ended
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Mar. 31, 2018
Investments [Abstract] |
Marketable Securities | Held to maturity and available for sale investment securities have been classified according to management’s intent and were as follows as of March 31, 2018 and September 30, 2017 (dollars in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
March 31, 2018 |  |  |  |  |  |  |
Held to maturity |  |  |  |  |  |  |
Mortgage-backed securities ("MBS"): |  |  |  |  |  |  |
U.S. government agencies | $ | 1,547 |  |  | $ | 9 |  |  | $ | (18 | ) |  | $ | 1,538 |
Private label residential | 527 |  |  | 568 |  |  | (2 | ) |  | 1,093 |
U.S. Treasury and U.S government agency securities | 5,996 |  |  | — |  |  | (74 | ) |  | 5,922 |
Total | $ | 8,070 |  |  | $ | 577 |  |  | $ | (94 | ) |  | $ | 8,553 |
Available for sale |  |  |  |  |  |  |  |  |  |  |
MBS: U.S. government agencies | $ | 252 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 262 |
Mutual funds | 1,000 |  |  | — |  |  | (69 | ) |  | 931 |
Total | $ | 1,252 |  |  | $ | 10 |  |  | $ | (69 | ) |  | $ | 1,193 |
September 30, 2017 |  |  |  |  |  |  |
Held to maturity |  |  |  |  |  |  |  |  |  |  |
MBS: |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies | $ | 532 |  |  | $ | 11 |  |  | $ | (1 | ) |  | $ | 542 |
Private label residential | 599 |  |  | 596 |  |  | (2 | ) |  | 1,193 |
U.S. Treasury and U.S. government agency securities | 6,008 |  |  | 10 |  |  | (9 | ) |  | 6,009 |
Total | $ | 7,139 |  |  | $ | 617 |  |  | $ | (12 | ) |  | $ | 7,744 |
Available for sale |  |  |  |  |  |  |  |  |  |  |
MBS: U.S. government agencies | $ | 271 |  |  | $ | 18 |  |  | $ | — |  |  | $ | 289 |
Mutual funds | 1,000 |  |  | — |  |  | (48 | ) |  | 952 |
Total | $ | 1,271 |  |  | $ | 18 |  |  | $ | (48 | ) |  | $ | 1,241 |
Unrealized Gain (Loss) on Investments | March 31, 2018 (dollars in thousands):
| Less Than 12 Months |  | 12 Months or Longer |  | Total
| Estimated Fair Value |  | Gross Unrealized Losses |  | Quantity |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Quantity |  | Estimated Fair Value |  | Gross Unrealized Losses
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies | $ | 1,063 |  |  | $ | (18 | ) |  | 2 |  |  | $ | 71 |  |  | $ | — |  |  | 5 |  |  | $ | 1,134 |  |  | $ | (18 | )
Private label residential | — |  |  | — |  |  | — |  |  | 76 |  |  | (2 | ) |  | 10 |  |  | 76 |  |  | (2 | )
U.S. Treasury and U.S. government agency securities | 5,922 |  |  | (74 | ) |  | 2 |  |  | — |  |  | — |  |  | — |  |  | 5,922 |  |  | (74 | )
Total | $ | 6,985 |  |  | $ | (92 | ) |  | 4 |  |  | $ | 147 |  |  | $ | (2 | ) |  | 15 |  |  | $ | 7,132 |  |  | $ | (94 | )
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MBS: U.S. government agency | $ | 35 |  |  | $ | — |  |  | 1 |  |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | 35 |  |  | $ | — |
Mutual funds | — |  |  | — |  |  | — |  |  | 931 |  |  | (69 | ) |  | 1 |  |  | 931 |  |  | (69 | )
Total | $ | 35 |  |  | $ | — |  |  | 1 |  |  | $ | 931 |  |  | $ | (69 | ) |  | 1 |  |  | $ | 966 |  |  | $ | (69 | )
Held to maturity and available for sale investment securities with unrealized losses were as follows for September 30, 2017 (dollars in thousands):
| Less Than 12 Months |  | 12 Months or Longer |  | Total
| Estimated Fair Value |  | Gross Unrealized Losses |  | Quantity |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Quantity |  | Estimated Fair Value |  | Gross Unrealized Losses
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies | $ | — |  |  | $ | — |  |  | — |  |  | $ | 114 |  |  | $ | (1 | ) |  | 6 |  |  | $ | 114 |  |  | $ | (1 | )
Private label residential | — |  |  | — |  |  | — |  |  | 85 |  |  | (2 | ) |  | 10 |  |  | 85 |  |  | (2 | )
U.S. Treasury and U.S. government agency securities | 2,984 |  |  | (9 | ) |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 2,984 |  |  | (9 | )
Total | $ | 2,984 |  |  | $ | (9 | ) |  | 1 |  |  | $ | 199 |  |  | $ | (3 | ) |  | 16 |  |  | $ | 3,183 |  |  | $ | (12 | )
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds | $ | — |  |  | $ | — |  |  | — |  |  | $ | 952 |  |  | $ | (48 | ) |  | 1 |  |  | $ | 952 |  |  | $ | (48 | )
Total | $ | — |  |  | $ | — |  |  | — |  |  | $ | 952 |  |  | $ | (48 | ) |  | 1 |  |  | $ | 952 |  |  | $ | (48 | )
Schedule of Significant Inputs Utilized to Measure Estimate of Credit Loss Component on OTTI Securities | The following table presents a summary of the significant inputs utilized to measure management’s estimates of the credit loss component on OTTI securities as of March 31, 2018 and 2017:
| Range |  | Weighted
| Minimum |  | Maximum |  | Average
March 31, 2018 |  |  |  |  |
Constant prepayment rate | 6.00 | % |  | 15.00 | % |  | 11.01 | %
Collateral default rate | — | % |  | 11.85 | % |  | 5.04 | %
Loss severity rate | — | % |  | 72.00 | % |  | 38.32 | %
March 31, 2017 |  |  |  |  |
Constant prepayment rate | 6.00 | % |  | 15.00 | % |  | 12.25 | %
Collateral default rate | 0.10 | % |  | 13.61 | % |  | 5.17 | %
Loss severity rate | 5.00 | % |  | 76.00 | % |  | 45.14 | %
Other than Temporary Impairment, Credit Losses Recognized in Earnings | The following table presents the OTTI recoveries (losses) for the three and six months ended March 31, 2018 and 2017 (dollars in thousands):
| Three Months Ended March 31, 2018 |  | Three Months Ended March 31, 2017
| Held To Maturity |  | Available For Sale |  | Held To Maturity |  | Available For Sale
Total recoveries | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Adjustment for portion of OTTI transferred from other comprehensive income before income taxes (1) | — |  |  | — |  |  | — |  |  | — |
Net recoveries recognized in earnings (2) | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| Six Months Ended March 31, 2018 |  | Six Months Ended March 31, 2017
| Held To Maturity |  | Available For Sale |  | Held To Maturity |  | Available For Sale
Total recoveries | $ | 41 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Adjustment for portion of OTTI transferred from other comprehensive income before income taxes (1) | (5 | ) |  | — |  |  | — |  |  | — |
Net recoveries recognized in earnings (2) | $ | 36 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
_________________ (1) Represents OTTI related to all other factors. (2) Represents OTTI related to credit losses. The following table presents a roll forward of the credit loss component of held to maturity and available for sale debt securities that have been written down for OTTI with the credit loss component recognized in earnings for the six months ended March 31, 2018 and 2017 (dollars in thousands):
| Six Months Ended March 31,
| 2018 |  |  | 2017 |
Beginning balance of credit loss | $ | 1,301 |  |  | $ | 1,505 |
Additions: |  |  |  |  |
Additional increases to the amount related to credit loss for which OTTI was previously recognized | 13 |  |  | — |
Subtractions: |  |  |  |
Realized losses previously recorded as credit losses | (41 | ) |  | (36 | )
Recovery of prior credit loss | (35 | ) |  | — |
Ending balance of credit loss | $ | 1,238 |  |  | $ | 1,469 |
Schedule of Contractual Maturities of Debt Securities | The contractual maturities of debt securities at March 31, 2018 were as follows (dollars in thousands). Expected maturities may differ from scheduled maturities due to the prepayment of principal or call provisions.
| Held to Maturity |  | Available for Sale
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due within one year | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Due after one year to five years | 7,071 |  |  | 6,980 |  |  | — |  |  | — |
Due after five years to ten years | 43 |  |  | 43 |  |  | — |  |  | — |
Due after ten years | 956 |  |  | 1,530 |  |  | 252 |  |  | 262 |
Total | $ | 8,070 |  |  | $ | 8,553 |  |  | $ | 252 |  |  | $ | 262 |

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