Quarterly report pursuant to Section 13 or 15(d)

Equity Reclassifications out of Accumulated Other Comprehensive Income (Details)

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Equity Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains on sales of certain AFS securities, net of tax $ (31,249) $ (8,331) $ 21,103 $ (37,805)
Amounts reclassified from accumulated other comprehensive income (loss) (5,718) (5,040) (3,595) (23,449)
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 429 90 429 807
Realized gains on sales of certain AFS securities, net of tax $ (6,147) $ (5,130) $ 3,166 $ (24,256)