CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Trading investments, cost	$ 12,551
Available-for-sale investments, cost	607,867	$ 485,756
Allowance for credit losses on loans and leases	$ 1,673,324	$ 441,912
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
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)	456,400,000	453,600,000
Accumulated other comprehensive income, tax	$ 13,979	$ 3,995
Treasury stock, shares (in shares)	81,300,000	32,500,000
Series B Preferred Stock
Preferred stock, par or stated value (in dollars per share)	$ 100	$ 100
Preferred stock, shares outstanding (in shares)	4,000,000	4,000,000