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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Allowance for loan losses:
Beginning balance	$ 471,238	$ 407,837	$ 443,424	$ 427,597
Charge-offs	(73,935)	(15,722)	(135,526)	(64,567)
Recoveries	7,113	11,040	23,758	24,711
Provision for (reversal of) loan losses	73,116	18,204	145,876	33,618
Ending balance	477,532	421,359	477,532	421,359
Commercial & Industrial
Allowance for loan losses:
Beginning balance	159,987	160,008	161,550	188,364
Charge-offs	(40,483)	(6,676)	(71,197)	(35,951)
Recoveries	3,842	6,904	13,720	12,476
Provision for (reversal of) loan losses	56,322	(1,209)	75,595	(5,862)
Ending balance	179,668	159,027	179,668	159,027
Commercial Real Estate
Allowance for loan losses:
Beginning balance	169,726	104,218	143,575	97,760
Charge-offs	(23,364)	(143)	(23,465)	(2,851)
Recoveries	310	425	972	1,358
Provision for (reversal of) loan losses	16,490	17,101	42,080	25,334
Ending balance	163,162	121,601	163,162	121,601
Total consumer
Allowance for loan losses:
Beginning balance	141,525	143,611	138,299	141,473
Charge-offs	(10,088)	(8,903)	(40,864)	(25,765)
Recoveries	2,961	3,711	9,066	10,877
Provision for (reversal of) loan losses	304	2,312	28,201	14,146
Ending balance	$ 134,702	$ 140,731	$ 134,702	$ 140,731