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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 29,827 $ 19,266 $ 99,858 $ 60,020
Other comprehensive income (loss)        
Unrealized holding gains (losses), net of tax 193 (20) (361) (7)
Comprehensive income $ 30,020 $ 19,246 $ 99,497 $ 60,013