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Note Debt Securities Available for Sale (Debt securities available- for-sale - Additional Information) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale      
Available-for-sale $ 0 $ 14,423 $ 4,815
Gross Unrealized Losses $ 209,307 $ 133,085