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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains on sales of certain AFS securities, net of tax $ (5,618) $ (28,290) $ 15,485 $ (66,095)
Amounts reclassified from accumulated other comprehensive income (loss) 4,220 (29,381) (7,815) (52,830)
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 0 1,015 429 1,822
Realized gains on sales of certain AFS securities, net of tax $ 4,220 $ (30,396) $ 7,386 $ (54,652)