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Investment Securities - Additional information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) position security | Mar. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) position security | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) security | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
Investment Securities: |  |  |  |  |  |  |
Held to maturity securities, fair value | $ 61,890,000 |  | $ 61,890,000 |  | $ 58,621,000 |  |
The weighted average duration of the total investment securities portfolio |  |  | 43 months 21 days |  | 49 months 12 days |  |
Proceeds from sales of investment securities - available for sale | 0 |  | $ 935,000 | $ 0 |  |  |
Book value of securities available for sale and held to maturity | 137,120,000 |  | 137,120,000 |  | $ 135,624,000 |  |
Accrued interest receivable on available for sale debt securities | 1,100,000 |  | 1,100,000 |  | 988,000 |  |
Gross investment gains |  |  | $ 0 |  |  |  |
Premium percentage on mortgage backed securities purchased |  |  | 100.70% |  |  |  |
Unrealized loss on equity securities |  |  | $ 0 |  |  |  |
Held to maturity, allowance for credit losses | 88,000 |  | 88,000 | 32,000 | 37,000 | $ 100,000 | $ 109,000
Accrued interest receivable on held to maturity debt securities | 439,000 |  | 439,000 |  | 388,000 |  |
Held to maturity debt securities in non-accrual | 0 |  | 0 |  | 0 |  |
Charge-off resulted from sale of securities |  |  | 491,000 |  |  |  |
Provision for credit losses recovery recognized |  |  | 75,000 |  |  |  |
Available for Sale Securities, allowance for credit losses | $ 360,000 |  | $ 360,000 | 926,000 | $ 926,000 | 360,000 | 926,000
Number of available for sale debt securities in non accrual status | security | 1 |  | 1 |  | 1 |  |
Available-for-Sale debt securities in non-accrual | $ 1,000,000.0 |  | $ 1,000,000.0 |  | $ 926,000 |  |
Unpaid interest | 73,000 |  | $ 73,000 | 17,000 |  |  |
Percentage of unrealized loss position for less than 12 months |  |  | 1.60% |  |  |  |
Percentage of unrealized loss position for greater than 12 months |  |  | 10.10% |  |  |  |
Debt Securities, Available-for-Sale, Realized Gain (Loss) |  |  | $ 0 |  |  |  |
U.S. Agency |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Held to maturity securities, fair value | 2,216,000 |  | 2,216,000 |  | 2,121,000 |  |
Held to maturity, allowance for credit losses | $ 0 |  | $ 0 |  |  |  |
Unrealized loss position for greater than 12 months, Number of positions | position | 6 |  | 6 |  |  |  |
U.S. Agency mortgage-backed securities |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Held to maturity securities, fair value | $ 25,553,000 |  | $ 25,553,000 |  | 22,213,000 |  |
Held to maturity, allowance for credit losses | $ 0 |  | $ 0 |  |  |  |
Unrealized loss position for greater than 12 months, Number of positions | position | 130 |  | 130 |  |  |  |
Municipal |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Held to maturity securities, fair value | $ 30,783,000 |  | $ 30,783,000 |  | 29,990,000 |  |
Held to maturity, allowance for credit losses | $ 2,000 |  | $ 2,000 | 2,000 | 2,000 | 2,000 | 2,000
Unrealized loss position for greater than 12 months, Number of positions | position | 26 |  | 26 |  |  |  |
Corporate bonds |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Charge-off resulted from sale of securities |  |  | $ 491,000 |  |  |  |
Available for Sale Securities, allowance for credit losses | $ 360,000 |  | $ 360,000 | $ 926,000 | $ 926,000 | $ 360,000 | $ 926,000
Unrealized loss position for less than 12 months, Number of positions | position | 4 |  | 4 |  |  |  |
Unrealized loss position for greater than 12 months, Number of positions | position | 74 |  | 74 |  |  |  |
Subordinated debt investment |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Charge-off resulted from sale of securities |  | $ 491,000 |  |  |  |  |
Provision for credit losses recovery recognized |  | $ 435,000 |  |  |  |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |  |  |
Portfolio rated | 57.20% |  | 57.20% |  | 55.90% |  |
Securities rated below A |  |  |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |  |  |
Portfolio rated | 14.50% |  | 14.50% |  | 15.10% |  |
Maximum |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
The weighted average duration of the total investment securities portfolio |  |  | 60 months |  |  |  |

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