Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Reclassifications out of Accumulated Other Comprehensive Income (Details)

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Stockholders' Equity Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized (gains) losses on sales of certain AFS securities, net of tax $ (280,118) $ 341,312 $ 34,695
Amounts reclassified from accumulated other comprehensive income (loss) 217,763 254,339 5,996
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other-than-temporary impairments on AFS securities 14,312 470 789
Realized (gains) losses on sales of certain AFS securities, net of tax $ (232,075) $ 253,869 $ 5,207