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Loans and Allowance for Loan Losses (Schedule of Allowances for Loan Losses and Recorded Investment in Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Allowance for loan losses:
Beginning balance	$ 516,708	$ 588,648	$ 605,736	$ 281,402
Charge-offs	(29,881)	(35,346)	(86,059)	(89,999)
Recoveries	9,365	6,880	18,793	17,426
(Reversal of) provision for loan losses	(3,949)	43,618	(46,227)	311,977
Ending balance	492,243	603,800	492,243	603,800
Impact from Adoption
Allowance for loan losses:
Beginning balance				82,994
Adjusted balance
Allowance for loan losses:
Beginning balance				364,396
Commercial & Industrial
Allowance for loan losses:
Beginning balance	254,938	229,915	229,555	145,782
Charge-offs	(20,230)	(19,367)	(48,374)	(57,497)
Recoveries	1,760	3,796	6,027	8,798
(Reversal of) provision for loan losses	(5,961)	46,256	43,299	165,827
Ending balance	230,507	260,600	230,507	260,600
Commercial & Industrial | Impact from Adoption
Allowance for loan losses:
Beginning balance				(2,310)
Commercial & Industrial | Adjusted balance
Allowance for loan losses:
Beginning balance				143,472
Commercial Real Estate
Allowance for loan losses:
Beginning balance	92,113	171,526	130,742	67,430
Charge-offs	(718)	(6,878)	(14,877)	(8,585)
Recoveries	4,535	1,225	5,938	2,160
(Reversal of) provision for loan losses	(4,278)	(22,068)	(30,151)	83,451
Ending balance	91,652	143,805	91,652	143,805
Commercial Real Estate | Impact from Adoption
Allowance for loan losses:
Beginning balance				(651)
Commercial Real Estate | Adjusted balance
Allowance for loan losses:
Beginning balance				66,779
Consumer
Allowance for loan losses:
Beginning balance	169,657	187,207	245,439	68,190
Charge-offs	(8,933)	(9,101)	(22,808)	(23,917)
Recoveries	3,070	1,859	6,828	6,468
(Reversal of) provision for loan losses	6,290	19,430	(59,375)	62,699
Ending balance	$ 170,084	$ 199,395	$ 170,084	199,395
Consumer | Impact from Adoption
Allowance for loan losses:
Beginning balance				85,955
Consumer | Adjusted balance
Allowance for loan losses:
Beginning balance				$ 154,145

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