Investment Securities - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Amortized cost basis, unrealized loss positions	$ 832,901	$ 788,798
Unrealized loss position, less than 12 months	3,322	3,362
Unrealized loss position	27,229	25,181
Unrealized loss position, 12 months or longer	$ 23,907	$ 21,819