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Changes in ounces of silver and their respective values (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
oz
Jun. 30, 2020
USD ($)
oz
Jun. 30, 2021
USD ($)
oz
Jun. 30, 2020
USD ($)
oz
Accounting Policies [Abstract]        
Opening balance | oz 36,939,582.4 24,070,487.0 32,617,862.0 23,216,266.6
Creations | oz 3,571,050.2 4,162,944.1 9,560,139.9 5,761,068.7
Redemptions | oz (48,405.3) (1,641,983.4) (775,191.5)
Transfers of silver to pay expenses | oz (28,586.3) (18,907.0) (53,972.2) (36,025.0)
Closing balance | oz 40,482,046.3 28,166,118.8 40,482,046.3 28,166,118.8
Opening balance $ 886,550 $ 335,302 $ 863,884 $ 418,938
Creations 95,196 65,385 255,640 88,342
Redemptions (730) (45,079) (13,829)
Realized gain / (loss) on silver distributed for the redemption of Shares 1,261 (124) 14,272 (235)
Transfers of silver to pay expenses (748) (292) (1,422) (601)
Realized gain / (loss) on silver transferred to pay expenses 173 (43) 357 (46)
Change in unrealized (loss) / gain on investment in silver 60,588 103,126 (44,632) 10,055
Closing balance $ 1,043,020 $ 502,624 $ 1,043,020 $ 502,624