Loans - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019		Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 33,378,303	[1]	$ 31,061,111	[1]	$ 27,990,048
Allowance for loan losses	444,490		200,307		184,911	$ 180,424
Total net loans	32,933,813		30,860,804
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			158,598
Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	22,124,430		20,051,091		17,176,112
Allowance for loan losses	254,516		122,486		103,713	98,947
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	4,639,692		4,337,017		3,946,943
Allowance for loan losses	47,625		36,112		34,382	31,311
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	6,119,383		6,177,139		6,360,763
Allowance for loan losses	123,022		28,443		34,154	37,439
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	494,798		495,864		506,230
Allowance for loan losses	$ 19,327		$ 13,266		$ 12,662	$ 12,727

[1] March 31, 2020 and December 31, 2019 include $20.8 million and $18.8 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.