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Related party transactions (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 06, 2025 | Jun. 01, 2020 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Related party transactions |  |  |  |  |  |  |  |
Interest bearing deposits | $ 3,387,752 |  |  | $ 3,387,752 |  | $ 3,387,752 |  | $ 3,472,036
Payment to goods or services from related party |  |  |  | 50 | $ 0 | 136 | $ 6 |
Related party |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |
Outstanding balance of non-performing loans |  |  |  |  |  | 0 |  | 0
Interest bearing deposits | 155,500 |  |  | 155,500 |  | 155,500 |  | 132,000
Subordinate Notes Due 2030 |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |
Aggregate principal amount | $ 33,000 |  |  | 33,000 |  | 33,000 |  |
Interest rate | 5.375% |  | 5.375% |  |  |  |  |
Subordinate Notes Due 2030 | Related party |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |
Aggregate principal amount | $ 3,000 |  |  | $ 3,000 |  | $ 3,000 |  | $ 3,000
Subordinate Notes Due 2035 |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 85,000 |  |  |  |  |  |
Interest rate |  | 7.75% |  |  |  |  |  |

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