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, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized gains on sales of certain AFS securities, net of tax $ 34,695 $ 107,374 $ (363,379)
Amounts reclassified from accumulated other comprehensive income (loss) (5,996) (101,030) (335,695)
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 789 1,822 535
Realized gains on sales of certain AFS securities, net of tax $ 5,207 $ (102,852) $ (336,230)