Investment Securities (Tables)
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3 Months Ended |
Dec. 31, 2022 |
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| Investments [Abstract] |
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| Schedule of Available-for-sale Securities Reconciliation |
Investments available for sale are summarized in the tables below. Accrued interest in the periods presented is $1,249 and $1,122 as of December 31, 2022 and September 30, 2022, respectively, and is reported in accrued interest receivable on the CONSOLIDATED STATEMENTS OF CONDITION. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2022 | | | | Amortized
Cost | | Gross
Unrealized | | Fair
Value | | | | Gains | | Losses | | | REMICs | | $ | 514,549 | | | $ | 26 | | | $ | (46,037) | | | $ | 468,538 | | | Fannie Mae certificates | | 934 | | | 10 | | | (1) | | | 943 | | | U.S. government and agency obligations | | 4,053 | | | — | | | (403) | | | 3,650 | | | Total | | $ | 519,536 | | | $ | 36 | | | $ | (46,441) | | | $ | 473,131 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2022 | | | | Amortized
Cost | | Gross
Unrealized | | Fair
Value | | | | Gains | | Losses | | | REMICs | | $ | 496,529 | | | $ | 1 | | | $ | (43,262) | | | $ | 453,268 | | | Fannie Mae certificates | | 1,011 | | | 14 | | | (4) | | | 1,021 | | | U.S. government and agency obligations | | 4,057 | | | — | | | (438) | | | 3,619 | | | Total | | $ | 501,597 | | | $ | 15 | | | $ | (43,704) | | | $ | 457,908 | |
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| Debt Securities, Available-for-sale |
The following is a summary of our securities portfolio by the period remaining until contractual maturity and yield at December 31, 2022. Maturities are based on the final contractual payment dates, and do not reflect the impact of prepayments or early redemptions that may occur. Weighted average yields are not presented on a tax-equivalent basis and are calculated by multiplying each carry value by its yield and dividing the sum of these results by the total carry values. We did not hold any tax-free securities. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2022 | | September 30, 2022 | | Amortized Cost | | Fair Value | | Weighted Average Yield | | Amortized Cost | | Fair Value | | Weighted Average Yield | | Less than one year | $ | 180 | | | $ | 176 | | | 1.89 | % | | $ | — | | | $ | — | | | — | % | | One to five years | 13,835 | | | 13,139 | | | 2.10 | % | | 15,476 | | | 14,775 | | | 2.06 | % | | Five to ten years | 39,090 | | | 37,021 | | | 2.29 | % | | 38,927 | | | 37,204 | | | 2.30 | % | | Ten years or greater | 466,431 | | | 422,795 | | | 2.57 | % | | 447,194 | | | 405,929 | | | 2.25 | % | | Total | $ | 519,536 | | | $ | 473,131 | | | 2.53 | % | | $ | 501,597 | | | $ | 457,908 | | | 2.25 | % |
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| Available-for-sale Securities [Table Text Block] |
Gross unrealized losses on available for sale securities and the estimated fair value of the related securities, aggregated by the length of time the securities have been in a continuous loss position, at December 31, 2022 and September 30, 2022, were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2022 | | Less Than 12 Months | | 12 Months or More | | Total | | Estimated Fair Value | | Unrealized Loss | | Estimated Fair Value | | Unrealized Loss | | Estimated Fair Value | | Unrealized Loss | | Available for sale— | | | | | | | | | | | | | REMICs | $ | 215,958 | | | $ | 10,315 | | | $ | 240,933 | | | $ | 35,722 | | | $ | 456,891 | | | $ | 46,037 | | | Fannie Mae certificates | 246 | | | 1 | | | — | | | — | | | 246 | | | 1 | | | U.S. government and agency obligations | — | | | — | | | 3,650 | | | 403 | | | 3,650 | | | 403 | | | Total | $ | 216,204 | | | $ | 10,316 | | | $ | 244,583 | | | $ | 36,125 | | | $ | 460,787 | | | $ | 46,441 | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2022 | | | | Less Than 12 Months | | 12 Months or More | | Total | | | | Estimated Fair Value | | Unrealized Loss | | Estimated Fair Value | | Unrealized Loss | | Estimated Fair Value | | Unrealized Loss | | | | Available for sale— | | | | | | | | | | | | | | | REMICs | $ | 261,795 | | | $ | 17,260 | | | $ | 190,739 | | | $ | 26,002 | | | $ | 452,534 | | | $ | 43,262 | | | | | Fannie Mae certificates | 217 | | | 4 | | | — | | | — | | | 217 | | | 4 | | | | | U.S. government and agency obligations | 3,619 | | | 438 | | | — | | | — | | | 3,619 | | | 438 | | | | | Total | $ | 265,631 | | | $ | 17,702 | | | $ | 190,739 | | | $ | 26,002 | | | $ | 456,370 | | | $ | 43,704 | | | |
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