Accumulated Other Comprehensive Income (Loss) ("AOCIL"), Reclassification Out of Each Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassifications out of AOCIL [Abstract]
Total reclassifications before tax	$ 27,143	$ 5,755
Interest expense	2,218	5,388
Income tax expense	5,106	945
Reclassifications, net of tax	22,037	4,810
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Reclassifications, net of tax	1,119	141
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 available for sale	1,416	253
Net impairment loss recognized in earnings		0
Total reclassifications before tax		253
Income tax expense	$ 297	53
Reclassifications, net of tax		200
Unrealized Losses on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Interest expense		75
Income tax expense		16
Reclassifications, net of tax		$ 59