| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 10-K | Open Document | Data | Open Filing | 10-K | 19 Dec 2025 | 30 Sep 2025 | 000-56575 |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 14 Aug 2025 | 30 Jun 2025 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | MERCER BANCORP, INC. FORM 8-K JUNE 17, 2025 | 20 Jun 2025 | 17 Jun 2025 | 000-56575 |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 15 May 2025 | 31 Mar 2025 | 000-56575 |
| 4 | Open Document | Open Filing | FORM 4 | 03 Apr 2025 | 01 Apr 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 03 Apr 2025 | 01 Apr 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 03 Apr 2025 | 01 Apr 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 03 Apr 2025 | 01 Apr 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 03 Apr 2025 | 01 Apr 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 28 Feb 2025 | 26 Feb 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 28 Feb 2025 | 26 Feb 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 28 Feb 2025 | 26 Feb 2025 | |
| 4 | Open Document | Open Filing | FORM 4 | 28 Feb 2025 | 26 Feb 2025 | |
| 8-K | Open Document | Data | Open Filing | 26 Feb 2025 | 25 Feb 2025 | 000-56575 | |
| S-8 | Open Document | Open Filing | MERCER BANCORP, INC. FORM S-8 REGISTRATION STATEMENT FEBRUARY 26, 2025 | 26 Feb 2025 | 333-285259 | |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 14 Feb 2025 | 31 Dec 2024 | 000-56575 |
| SCHEDULE 13G | Open Document | Open Filing | 12 Feb 2025 | 005-94304 | ||
| ARS | Open Document | Open Filing | ARS | 22 Jan 2025 | 30 Sep 2024 | 000-56575 |
| DEF 14A | Open Document | Open Filing | DEF 14A | 22 Jan 2025 | 25 Feb 2025 | 000-56575 |
| 10-K | Open Document | Data | Open Filing | 10-K | 14 Jan 2025 | 30 Sep 2024 | 000-56575 |
| NT 10-K | Open Document | Open Filing | MERCER BANCORP, INC. 12B-25 FORM 10-K SEPTEMBER 30, 2024 | 30 Dec 2024 | 30 Sep 2024 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | 18 Dec 2024 | 18 Dec 2024 | 000-56575 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Nov 2024 | 09 Jul 2024 | |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 14 Aug 2024 | 30 Jun 2024 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | 10 Jul 2024 | 09 Jul 2024 | 000-56575 | |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 20 May 2024 | 31 Mar 2024 | 000-56575 |
| 10-Q/A | Open Document | Data | Open Filing | 10-Q/A | 20 May 2024 | 31 Dec 2023 | 000-56575 |
| NT 10-Q | Open Document | Open Filing | NT 10-Q | 15 May 2024 | 31 Mar 2024 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | 8-K | 15 May 2024 | 14 May 2024 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | 8-K | 21 Feb 2024 | 20 Feb 2024 | 000-56575 |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 14 Feb 2024 | 31 Dec 2023 | 000-56575 |
| SC 13G | Open Document | Open Filing | 26 Jan 2024 | 005-94304 | ||
| ARS | Open Document | Open Filing | ARS | 17 Jan 2024 | 30 Sep 2023 | 000-56575 |
| DEF 14A | Open Document | Open Filing | DEF 14A | 17 Jan 2024 | 20 Feb 2024 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | FORM 8-K | 17 Jan 2024 | 16 Jan 2024 | 000-56575 |
| 10-K | Open Document | Data | Open Filing | 10-K | 29 Dec 2023 | 30 Sep 2023 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | FORM 8-K | 28 Nov 2023 | 21 Nov 2023 | 000-56575 |
| EFFECT | Open Document | Open Filing | 30 Oct 2023 | 333-270445 | ||
| POS AM | Open Document | Open Filing | POS AM | 19 Sep 2023 | 333-270445 | |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 14 Aug 2023 | 30 Jun 2023 | 000-56575 |
| 8-K | Open Document | Data | Open Filing | FORM 8-K | 26 Jul 2023 | 26 Jul 2023 | 000-56575 |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 3 | Open Document | Open Filing | FORM 3 | 26 Jul 2023 | 26 Jul 2023 | |
| 8-A12G | Open Document | Open Filing | 8-A12G | 26 Jul 2023 | 000-56575 | |
| 8-K | Open Document | Data | Open Filing | FORM 8-K | 21 Jul 2023 | 21 Jul 2023 | 333-270445 |
| 10-Q | Open Document | Data | Open Filing | 10-Q | 29 Jun 2023 | 31 Mar 2023 | 333-270445 |
| 424B3 | Open Document | Open Filing | 424B3 | 20 Jun 2023 | 333-270445 | |
| 424B3 | Open Document | Open Filing | 424B3 | 22 May 2023 | 333-270445 | |
| 8-K | Open Document | Open Filing | FORM 8-K | 17 May 2023 | 15 May 2023 | 333-270445 |
| EFFECT | Open Document | Open Filing | 15 May 2023 | 333-270445 | ||
| CORRESP | Open Document | Open Filing | 10 May 2023 | |||
| CORRESP | Open Document | Open Filing | 10 May 2023 | |||
| CORRESP | Open Document | Open Filing | 25 Apr 2023 | |||
| S-1/A | Open Document | Open Filing | S-1/A | 25 Apr 2023 | 333-270445 | |
| UPLOAD | Open Document | Open Filing | 10 Apr 2023 | |||
| S-1 | Open Document | Open Filing | FORM S-1 | 10 Mar 2023 | 333-270445 |