CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest expense related to derivatives reclassified from accumulated other comprehensive income	$ 3,819	$ 3,470	$ 7,483	$ 7,066
Net security gains reclassified from accumulated other comprehensive income	3,580	(259)	5,155	1,182
Income tax expense (benefit) reclassified from accumulated other comprehensive income	13,584	7,451	21,894	12,574
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Derivatives
Interest expense related to derivatives reclassified from accumulated other comprehensive income	100	30	265	227
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Net security gains reclassified from accumulated other comprehensive income	3,580	(259)	5,155	1,182
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income (Loss)
Income tax expense (benefit) reclassified from accumulated other comprehensive income	$ 880	$ (61)	$ 1,238	$ 201