Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized (gains) losses on sales of certain AFS securities, net of tax $ 20,671 $ 52,352
Amounts reclassified from accumulated other comprehensive income (loss) 1,235 9,313
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 94 0
Realized (gains) losses on sales of certain AFS securities, net of tax $ (1,329) $ 9,313