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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost | $ 185,749 | $ 247,607
Allowance for loan losses | $ 295,277 | $ 251,475
Preferred stock, 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) | 449,400,000 | 443,500,000
Tax expense for accumulated other comprehensive (loss) income | $ (7,448) | $ (1,696)
Common stock held in treasury (in shares) | 14,000,000 | 11,100,000
Series B Preferred Stock |  |
Preferred stock, stated value (in dollars per share) | $ 100 | $ 100
Preferred stock shares outstanding (in shares) | 4,000,000 | 4,000,000

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