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Consolidated Statements of Condition (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Consolidated Statements of Condition    
Held to maturity, Market value (in dollars) $ 3,400 $ 3,400
Available for sale, Amortized cost (in dollars) $ 4,404,302 $ 4,254,960
Common shares, par value (in dollars per share) $ 1.00 $ 1.00
Common shares, Authorized shares 275,000,000 275,000,000
Common shares, issued shares 96,357,314 96,350,977
Treasury, shares 33,062,339 32,979,273