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SECURITIES (Tables) | 6 Months Ended
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Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Securities Available for Sale | The amortized cost, gross unrealized gains and losses and estimated fair values of available for sale ("AFS") and held to maturity ("HTM") debt securities are presented below.
(Dollars in Thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
At March 31, 2020 |  |  |  |  |  |  |
Debt securities AFS |  |  |  |  |  |  |
SBA securities | $ | 168,697 |  |  | $ | 4,569 |  |  | $ | (20) |  |  | $ | 173,246 |
Obligations of states and political subdivisions | 858 |  |  | 14 |  |  | — |  |  | 872 |
Non-bank qualified obligations of states and political subdivisions | 341,080 |  |  | 5,587 |  |  | (497) |  |  | 346,170 |
Asset-backed securities | 339,135 |  |  | — |  |  | (18,898) |  |  | 320,237 |
Mortgage-backed securities | 342,735 |  |  | 12,359 |  |  | — |  |  | 355,094 |
Total debt securities AFS | $ | 1,192,505 |  |  | $ | 22,529 |  |  | $ | (19,415) |  |  | $ | 1,195,619 |
(Dollars in Thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
At September 30, 2019 |  |  |  |  |  |  |
Debt securities AFS |  |  |  |  |  |  |
SBA securities | $ | 182,327 |  |  | $ | 3,655 |  |  | $ | — |  |  | $ | 185,982 |
Obligations of states and political subdivisions | 858 |  |  | 16 |  |  | — |  |  | 874 |
Non-bank qualified obligations of states and political subdivisions | 396,430 |  |  | 5,030 |  |  | (903) |  |  | 400,557 |
Asset-backed securities | 305,603 |  |  | 262 |  |  | (3,331) |  |  | 302,534 |
Mortgage-backed securities | 378,670 |  |  | 5,731 |  |  | (1,855) |  |  | 382,546 |
Total debt securities AFS | $ | 1,263,888 |  |  | $ | 14,694 |  |  | $ | (6,089) |  |  | $ | 1,272,493 |
Securities Held to Maturity |
(Dollars in Thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
At March 31, 2020 |  |  |  |  |  |  |
Debt securities HTM |  |  |  |  |  |  |
Non-bank qualified obligations of states and political subdivisions | $ | 108,105 |  |  | $ | 187 |  |  | $ | (767) |  |  | $ | 107,525 |
Mortgage-backed securities | 6,752 |  |  | 128 |  |  | — |  |  | 6,880 |
Total debt securities HTM | $ | 114,857 |  |  | $ | 315 |  |  | $ | (767) |  |  | $ | 114,405 |
(Dollars in Thousands) | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Fair Value
At September 30, 2019 |  |  |  |  |  |  |
Debt securities HTM |  |  |  |  |  |  |
Non-bank qualified obligations of states and political subdivisions | $ | 127,582 |  |  | $ | 108 |  |  | $ | (1,403) |  |  | $ | 126,287 |
Mortgage-backed securities | 7,182 |  |  | 14 |  |  | (13) |  |  | 7,183 |
Total debt securities HTM | $ | 134,764 |  |  | $ | 122 |  |  | $ | (1,416) |  |  | $ | 133,470 |
Debt Securities, Trading, and Equity Securities, FV-NI | Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows:
| LESS THAN 12 MONTHS |  |  |  | OVER 12 MONTHS |  |  |  | TOTAL |  |
(Dollars in Thousands) | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses)
At March 31, 2020 |  |  |  |  |  |  |  |  |  |  |
Debt securities AFS |  |  |  |  |  |  |  |  |  |  |
SBA securities | $ | 19,536 |  |  | $ | (20) |  |  | $ | — |  |  | $ | — |  |  | $ | 19,536 |  |  | $ | (20) |
Non-bank qualified obligations of states and political subdivisions | 27,484 |  |  | (37) |  |  | 46,259 |  |  | (460) |  |  | 73,743 |  |  | (497) |
Asset-backed securities | 196,361 |  |  | (7,499) |  |  | 123,876 |  |  | (11,399) |  |  | 320,237 |  |  | (18,898) |
Total debt securities AFS | $ | 243,381 |  |  | $ | (7,556) |  |  | $ | 170,135 |  |  | $ | (11,859) |  |  | $ | 413,516 |  |  | $ | (19,415) |
| LESS THAN 12 MONTHS |  |  |  | OVER 12 MONTHS |  |  |  | TOTAL |  |
(Dollars in Thousands) | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses)
At September 30, 2019 |  |  |  |  |  |  |  |  |  |  |
Debt securities AFS |  |  |  |  |  |  |  |  |  |  |
SBA securities | $ | 10,262 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 10,262 |  |  | $ | — |
Non-bank qualified obligations of states and political subdivisions | 66,326 |  |  | (177) |  |  | 55,428 |  |  | (726) |  |  | 121,754 |  |  | (903) |
Asset-backed securities | 158,176 |  |  | (1,823) |  |  | 93,259 |  |  | (1,508) |  |  | 251,435 |  |  | (3,331) |
Mortgage-backed securities | 1,713 |  |  | (1) |  |  | 89,634 |  |  | (1,854) |  |  | 91,347 |  |  | (1,855) |
Total debt securities AFS | $ | 236,477 |  |  | $ | (2,001) |  |  | $ | 238,321 |  |  | $ | (4,088) |  |  | $ | 474,798 |  |  | $ | (6,089) |
Schedule of Unrealized Loss on Investments |
| LESS THAN 12 MONTHS |  |  |  | OVER 12 MONTHS |  |  |  | TOTAL |  |
(Dollars in Thousands) | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses)
At March 31, 2020 |  |  |  |  |  |  |  |  |  |  |
Debt securities HTM |  |  |  |  |  |  |  |  |  |  |
Non-bank qualified obligations of states and political subdivisions | $ | — |  |  | $ | — |  |  | $ | 92,418 |  |  | $ | (767) |  |  | $ | 92,418 |  |  | $ | (767) |
Total debt securities HTM | $ | — |  |  | $ | — |  |  | $ | 92,418 |  |  | $ | (767) |  |  | $ | 92,418 |  |  | $ | (767) |
| LESS THAN 12 MONTHS |  |  |  | OVER 12 MONTHS |  |  |  | TOTAL |  |
(Dollars in Thousands) | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses) |  | Fair Value |  | Unrealized (Losses)
At September 30, 2019 |  |  |  |  |  |  |  |  |  |  |
Debt securities HTM |  |  |  |  |  |  |  |  |  |  |
Non-bank qualified obligations of states and political subdivisions | $ | 5,967 |  |  | $ | (6) |  |  | $ | 109,368 |  |  | $ | (1,397) |  |  | $ | 115,335 |  |  | $ | (1,403) |
Mortgage-backed securities | 1,471 |  |  | — |  |  | 1,803 |  |  | (13) |  |  | 3,274 |  |  | (13) |
Total debt securities HTM | $ | 7,438 |  |  | $ | (6) |  |  | $ | 111,171 |  |  | $ | (1,410) |  |  | $ | 118,609 |  |  | $ | (1,416) |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity | The amortized cost and fair value of debt securities by contractual maturity are shown below. Certain securities have call features that allow the issuer to call the security prior to maturity. Expected maturities may differ from contractual maturities in mortgage-backed securities ("MBS") because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, MBS are not included in the maturity categories in the following maturity summary. The expected maturities of certain SBA securities may differ from contractual maturities because the borrowers may have the right to prepay the obligation. However, certain prepayment penalties may apply.
Securities AFS at Fair Value | Amortized Cost |  | Fair Value
(Dollars in Thousands) |  |  |
At March 31, 2020 |  |  |
Due in one year or less | $ | 1,130 |  |  | $ | 1,138 |
Due after one year through five years | 12,689 |  |  | 13,067 |
Due after five years through ten years | 45,180 |  |  | 47,086 |
Due after ten years | 790,771 |  |  | 779,234 |
| 849,770 |  |  | 840,525 |
Mortgage-backed securities | 342,735 |  |  | 355,094 |
Total securities AFS, at fair value | $ | 1,192,505 |  |  | $ | 1,195,619 |
(Dollars in Thousands) | Amortized Cost |  | Fair Value
At September 30, 2019 |  |  |
Due in one year or less | $ | — |  |  | $ | — |
Due after one year through five years | 16,749 |  |  | 17,143 |
Due after five years through ten years | 50,263 |  |  | 51,840 |
Due after ten years | 818,206 |  |  | 820,964 |
| 885,218 |  |  | 889,947 |
Mortgage-backed securities | 378,670 |  |  | 382,546 |
Total securities AFS, at fair value | $ | 1,263,888 |  |  | $ | 1,272,493 |
Securities HTM at Fair Value | Amortized Cost |  | Fair Value
(Dollars in Thousands) |  |  |
At March 31, 2020 |  |  |
Due after ten years | $ | 108,105 |  |  | $ | 107,525 |
| 108,105 |  |  | 107,525 |
Mortgage-backed securities | 6,752 |  |  | 6,880 |
Total securities HTM, at cost | $ | 114,857 |  |  | $ | 114,405 |
(Dollars in Thousands) | Amortized Cost |  | Fair Value
At September 30, 2019 |  |  |
Due after ten years | $ | 127,582 |  |  | $ | 126,287 |
| 127,582 |  |  | 126,287 |
Mortgage-backed securities | 7,182 |  |  | 7,183 |
Total securities HTM, at cost | $ | 134,764 |  |  | $ | 133,470 |

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