Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	$ 56,161		$ 55,168
Card and merchant processing fees	39,678		29,992
Retail investment sales	30,108		27,471
Investment banking and advisory fees	23,896		28,301
Money transfer income	20,688		25,197
Asset management fees	10,770		9,771
subtotal - revenues	181,301		175,900
Other revenues	76,524	[1]	68,787	[2]
Total noninterest income	257,825		244,687
Commercial Banking and Wealth
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	11,206		12,235
Card and merchant processing fees	6,704		126
Retail investment sales	30,108		27,471
Investment banking and advisory fees	0		0
Money transfer income	0		0
Asset management fees	10,770		9,771
subtotal - revenues	58,788		49,603
Other revenues	2,448	[1]	282	[2]
Total noninterest income	61,236		49,885
Retail Banking
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	43,340		41,321
Card and merchant processing fees	29,953		27,924
Retail investment sales	0		0
Investment banking and advisory fees	0		0
Money transfer income	0		0
Asset management fees	0		0
subtotal - revenues	73,293		69,245
Other revenues	35,459	[1]	37,324	[2]
Total noninterest income	108,752		106,569
Corporate and Investment Banking
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	1,615		1,612
Card and merchant processing fees	0		0
Retail investment sales	0		0
Investment banking and advisory fees	23,896		28,301
Money transfer income	0		0
Asset management fees	0		0
subtotal - revenues	25,511		29,913
Other revenues	16,281	[1]	16,771	[2]
Total noninterest income	41,792		46,684
Treasury and Corporate Support and Other
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	0		0
Card and merchant processing fees	3,021		1,942
Retail investment sales	0		0
Investment banking and advisory fees	0		0
Money transfer income	20,688		25,197
Asset management fees	0		0
subtotal - revenues	23,709		27,139
Other revenues	22,336	[1]	14,410	[2]
Total noninterest income	$ 46,045		$ 41,549

[1] Other revenues primarily relate to revenues not derived from contracts with customers.

[2] Other revenues primarily relate to revenues not derived from contracts with customers.