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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 41,287 $ 31,032 $ 84,601 $ 64,180
Other comprehensive income (loss):        
Unrealized gain (loss) on debt securities on which an ("OTTI") impairment has been recognized 60 (294) 69 202
All other unrealized holding (losses) gains on available-for-sale securities arising during the period 17,407 (7,151) 37,908 (31,700)
Other comprehensive income (loss) for the period 17,467 (7,445) 37,977 (31,498)
Total comprehensive income $ 58,754 $ 23,587 $ 122,578 $ 32,682