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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for loan losses:
Beginning balance	$ 407,837	$ 516,708	$ 427,597	$ 605,736
Charge-offs	(15,722)	(29,881)	(64,567)	(86,059)
Recoveries	11,040	9,365	24,711	18,793
Provision for credit losses	18,204	(3,949)	33,618	(46,227)
Ending balance	421,359	492,243	421,359	492,243
Commercial & Industrial
Allowance for loan losses:
Beginning balance	160,008	254,938	188,364	229,555
Charge-offs	(6,676)	(20,230)	(35,951)	(48,374)
Recoveries	6,904	1,760	12,476	6,027
Provision for credit losses	(1,209)	(5,961)	(5,862)	43,299
Ending balance	159,027	230,507	159,027	230,507
Commercial Real Estate
Allowance for loan losses:
Beginning balance	104,218	92,113	97,760	130,742
Charge-offs	(143)	(718)	(2,851)	(14,877)
Recoveries	425	4,535	1,358	5,938
Provision for credit losses	17,101	(4,278)	25,334	(30,151)
Ending balance	121,601	91,652	121,601	91,652
Consumer
Allowance for loan losses:
Beginning balance	143,611	169,657	141,473	245,439
Charge-offs	(8,903)	(8,933)	(25,765)	(22,808)
Recoveries	3,711	3,070	10,877	6,828
Provision for credit losses	2,312	6,290	14,146	(59,375)
Ending balance	$ 140,731	$ 170,084	$ 140,731	$ 170,084