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Summary of significant accounting policies - Immaterial Prior Period Reclassification and Investment securities (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement
Noninterest-bearing deposits	$ 935,516,000	$ 644,683,000
Interest bearing deposits	3,472,036,000	2,634,354,000
Securities classified as trading	0	$ 0
Understatement of noninterest-bearing deposits
Error Corrections and Prior Period Adjustments Restatement
Noninterest-bearing deposits	210,300,000
Overstatement of interest-bearing deposits
Error Corrections and Prior Period Adjustments Restatement
Interest bearing deposits	$ 210,300,000

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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