Accumulated Other Comprehensive Income (Loss) ("AOCIL"), Reclassification Out of Each Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassifications out of AOCIL [Abstract]
Total reclassifications before tax	$ 19,645	$ 24,361	$ 61,841	$ 48,411
Interest expense	2,052	3,068	6,376	11,748
Income tax expense	3,683	4,777	11,454	9,245
Reclassifications, net of tax	15,962	19,584	50,387	39,166
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Reclassifications, net of tax	4	(245)	1,123	(310)
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassifications out of AOCIL [Abstract]
Reclassifications, net of tax	0	0	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	5	0	1,421	253
Net impairment loss recognized in earnings		0		0
Total reclassifications before tax		0		253
Income tax expense	$ 1	0	$ 298	53
Reclassifications, net of tax		0		200
Unrealized Losses on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Interest expense		310		646
Income tax expense		65		136
Reclassifications, net of tax		$ 245		$ 510