Investment Securities - Carrying value of other investment securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Other investment securities
Carrying Value	$ 211,458	$ 192,043
Federal Home Loan Bank stock
Other investment securities
Carrying Value	32,336	22,836
Federal Reserve Bank Stock
Other investment securities
Carrying Value	150,261	150,261
Investment in unconsolidated subsidiaries
Other investment securities
Carrying Value	3,563	3,563
Other investment securities
Other investment securities
Carrying Value	$ 25,298	$ 15,383