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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement of comprehensive income [abstract]    
Unrealized net gains on available-for-sale securities, tax $ 0 $ 0
Reclassification adjustment for realized losses (gains) on equity securities to earnings, tax $ 0 $ 0