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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for loan losses:
Beginning balance	$ 414,956	$ 563,214	$ 427,597	$ 605,736
Charge-offs	(23,698)	(30,853)	(48,845)	(56,178)
Recoveries	7,133	4,307	13,671	9,428
Provision for (reversal of) loan losses	9,446	(19,960)	15,414	(42,278)
Ending balance	407,837	516,708	407,837	516,708
Commercial & Industrial
Allowance for loan losses:
Beginning balance	178,722	254,777	188,364	229,555
Charge-offs	(15,512)	(18,729)	(29,275)	(28,146)
Recoveries	3,208	1,495	5,571	4,267
Provision for (reversal of) loan losses	(6,410)	17,395	(4,652)	49,262
Ending balance	160,008	254,938	160,008	254,938
Commercial Real Estate
Allowance for loan losses:
Beginning balance	94,696	113,812	97,760	130,742
Charge-offs	(252)	(3,839)	(2,708)	(14,158)
Recoveries	572	377	933	1,403
Provision for (reversal of) loan losses	9,202	(18,237)	8,233	(25,874)
Ending balance	104,218	92,113	104,218	92,113
Consumer
Allowance for loan losses:
Beginning balance	141,538	194,625	141,473	245,439
Charge-offs	(7,934)	(8,285)	(16,862)	(13,874)
Recoveries	3,353	2,435	7,167	3,758
Provision for (reversal of) loan losses	6,654	(19,118)	11,833	(65,666)
Ending balance	$ 143,611	$ 169,657	$ 143,611	$ 169,657

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