Marketable Securities - Available-for-sale, by Contractual Maturity (Details) - Mortgage-backed securities $ in Thousands	Jun. 30, 2024 USD ($)
Amortized cost
Due within one year	$ 74
Due after one year through five years	11,289
Due after five years through ten years	8,021
Due after ten years	1,048,990
Total mortgage-backed securities	1,068,374
Fair value
Due within one year	75
Due after one year through five years	11,185
Due after five years through ten years	7,022
Due after ten years	898,260
Total mortgage-backed securities	$ 916,542

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