Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 19,064	$ 47,014	$ 38,670	$ 93,072
Unrealized holding (losses) gains:
Before tax	(1,719)	38,237	60,835	64,989
Tax effect	381	(10,649)	(16,916)	(18,100)
Net of tax	(1,338)	27,588	43,919	46,889
Reclassification of net losses included in net income:
Before tax	0	0	(1,005)	0
Tax effect	0	0	282	0
Net of tax	0	0	(723)	0
Net unrealized holding (losses) gains	(1,338)	27,588	43,196	46,889
Derivative Instruments
Before tax	(7,300)	2,441	(17,340)	3,899
Tax effect	2,042	(680)	4,825	(1,086)
Net of tax	(5,258)	1,761	(12,515)	2,813
Total other comprehensive (loss) income	(6,596)	29,349	30,681	49,702
Total comprehensive income	$ 12,468	$ 76,363	$ 69,351	$ 142,774