Accumulated Other Comprehensive Income (Loss) ("AOCIL"), Reclassification Out of Each Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassifications out of AOCIL [Abstract]
Total reclassifications before tax	$ 18,295	$ 13,417	$ 24,050	$ 24,965
Interest expense	(3,292)	(6,817)	(8,680)	(13,210)
Income tax expense	3,523	2,687	4,468	4,854
Reclassifications, net of tax	14,772	10,730	19,582	20,111
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Reclassifications, net of tax	(206)	112	(65)	338
Accumulated Other Comprehensive Loss [Member]
Reclassifications out of AOCIL [Abstract]
Reclassifications, net of tax	0	0
Unrealized Gains on Securities Available For Sale [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Net gains on securities	0	0	253	137
Net impairment loss recognized in earnings	0	0	0	0
Total reclassifications before tax	0	0	253	137
Income tax expense	0	0	53	29
Reclassifications, net of tax	0	0	200	108
Unrealized Losses on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Interest expense	261	(142)	336	(291)
Income tax expense	55	(30)	71	(61)
Reclassifications, net of tax	$ 206	$ (112)	$ 265	$ (230)