Accumulated Other Comprehensive Income (Loss) ("AOCIL"), Reclassification Out of Each Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassifications out of AOCIL [Abstract]
Total reclassifications before tax	$ 15,053	$ 18,295	$ 42,196	$ 24,050
Interest expense	2,106	3,292	4,324	8,680
Income tax expense	2,665	3,523	7,771	4,468
Reclassifications, net of tax	12,388	14,772	34,425	19,582
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of AOCIL [Abstract]
Reclassifications, net of tax	0	(206)	1,119	(65)
Accumulated Other Comprehensive 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	0	0	1,416	253
Net impairment loss recognized in earnings		0		0
Total reclassifications before tax		0		253
Income tax expense	$ 0	0	$ 297	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		261		336
Income tax expense		55		71
Reclassifications, net of tax		$ 206		$ 265