. ( 2 ) securities with a carrying value of $ 4.7 billion and related unrealized pre-tax gain of $ 7 million , or $ 6 million net of tax , were transferred from held-to-maturity securities to available-for-sale securities during the year ended december 31 , 2018 , as part of a one-time transition election for early adopting the new derivatives and hedge accounting guidance . see note 1 2014 organization , basis of presentation and summary of significant accounting policies for additional information