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Marketable Securities - Available-for-sale, by Contractual Maturity (Details) - Residential mortgage-backed securities - agency
$ in Thousands
Jun. 30, 2022
USD ($)
Amortized cost  
Due in less than one year $ 142
Due in one year through five years 44,173
Due after five years through ten years 175,552
Due after ten years 1,030,594
Total marketable securities available-for-sale 1,250,461
Fair value  
Due in less than one year 142
Due in one year through five years 42,250
Due in five years through ten years 163,453
Due after ten years 921,995
Total marketable securities available-for-sale $ 1,127,840