Accumulated Other Comprehensive Loss ("AOCL"), Reclassification Out of Each Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassifications out of AOCL [Abstract]
Total reclassifications before tax	$ 15,570	$ 14,846	$ 40,535	$ 36,929
Interest expense	(6,939)	(4,755)	(20,149)	(11,739)
Income tax expense	3,125	2,921	7,979	7,026
Reclassifications, net of tax	12,445	11,925	32,556	29,903
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCL [Abstract]
Reclassifications, net of tax	80	57	418	68
Unrealized Gains (Losses) on Securities Available For Sale [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCL [Abstract]
Net gains (losses) on securities	0	0	137	(45)
Net impairment loss recognized in earnings	0	0	0	0
Total reclassifications before tax	0	0	137	(45)
Income tax expense	0	0	29	(9)
Reclassifications, net of tax	0	0	108	(36)
Unrealized Gains (Losses) on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCL [Abstract]
Interest expense	(102)	(73)	(393)	(132)
Income tax expense	(22)	(16)	(83)	(28)
Reclassifications, net of tax	$ (80)	$ (57)	$ (310)	$ (104)