CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest expense related to derivatives reclassified from accumulated other comprehensive income	$ 3,664	$ 3,596
Net security gains reclassified from accumulated other comprehensive income	1,575	1,441
Income tax expense (benefit) reclassified from accumulated other comprehensive income	8,310	5,123
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Derivatives
Interest expense related to derivatives reclassified from accumulated other comprehensive income	165	197
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Net security gains reclassified from accumulated other comprehensive income	1,575	1,441
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income (Loss)
Income tax expense (benefit) reclassified from accumulated other comprehensive income	$ 358	$ 261