Debt Securities - Total available-for-sale securities and aggregate depreciation (Details) - security	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	224	243
Aggregate depreciation	(7.27%)	(7.45%)
U.S Government and Federal agencies
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	7	13
Aggregate depreciation	(1.95%)	(2.30%)
GSE residential
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	169	184
Aggregate depreciation	(8.85%)	(9.40%)
State and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Number of debt securities, unrealized loss position	48	46
Aggregate depreciation	(5.81%)	(5.67%)