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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 45,839 $ 30,506
Other comprehensive (loss) income, net of tax    
Unrealized gain (loss) on debt securities arising during the period 23,505 (9,830)
Change in retirement obligation 290 323
Unrealized gain (loss) on derivatives 72 156
Other comprehensive income (loss) 23,867 (9,351)
Comprehensive income $ 69,706 $ 21,155