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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Trading investments, cost | $ 26,219 | $ 12,551
Available-for-sale investments, cost | 2,116,279 | 1,986,957
Allowance for credit losses on loans and leases | $ 1,179,021 | $ 1,361,723
Preferred stock, par or stated value (in dollars per share) | $ 0.20 | $ 0.20
Preferred stock, shares authorized (in shares) | 20,000,000 | 20,000,000
Preferred stock, shares outstanding (in shares) | 2,500,000 | 2,500,000
Preferred stock, liquidation preference (in dollars per share) | $ 100 | $ 100
Common stock, par value (in dollars per share) | $ 0.20 | $ 0.20
Common stock, shares authorized (in shares) | 1,125,000,000 | 1,125,000,000
Common stock, shares issued (in shares) | 431,100,000 | 456,700,000
Accumulated other comprehensive income, tax | $ (7,680) | $ (10,908)
Treasury stock, shares (in shares) | 102,700,000 | 81,400,000

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