Debt Securities - Total available-for-sale securities and aggregate depreciation (Details) - security	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	243	225
Aggregate depreciation	(7.45%)	(8.28%)
U.S Government and Federal agencies
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	13	13
Aggregate depreciation	(2.30%)	(2.46%)
GSE residential
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	184	175
Aggregate depreciation	(9.40%)	(10.66%)
State and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	46	37
Aggregate depreciation	(5.67%)	(5.60%)