Line of Business Segment Financial Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Net interest income	$ 79,483	$ 79,089
Provision for loan losses	2,000	4,500
Noninterest income	121,016	132,301
Noninterest expense	150,378	141,904
Income before income taxes	48,121	64,986
Income tax expense	13,180	18,619
Net income	34,941	46,367
Average assets	14,783,000	13,298,000
Bank [Member]
Segment Reporting Information [Line Items]
Net interest income	67,260	67,970
Provision for loan losses	257	1,835
Noninterest income	52,748	69,928
Noninterest expense	91,437	93,119
Income before income taxes	28,314	42,944
Income tax expense	7,181	11,605
Net income	21,133	31,339
Average assets	11,733,000	11,341,000
Payment Solutions [Member]
Segment Reporting Information [Line Items]
Net interest income	11,548	10,724
Provision for loan losses	1,743	2,665
Noninterest income	19,437	16,098
Noninterest expense	20,051	14,809
Income before income taxes	9,191	9,348
Income tax expense	2,786	2,916
Net income	6,405	6,432
Average assets	1,264,000	846,000
Institutional Investment Management [Member]
Segment Reporting Information [Line Items]
Net interest income		3
Provision for loan losses
Noninterest income	28,553	26,126
Noninterest expense	18,958	17,183
Income before income taxes	9,595	8,946
Income tax expense	2,635	2,572
Net income	6,960	6,374
Average assets	78,000	83,000
Asset Servicing [Member]
Segment Reporting Information [Line Items]
Net interest income	675	392
Provision for loan losses
Noninterest income	20,278	20,149
Noninterest expense	19,932	16,793
Income before income taxes	1,021	3,748
Income tax expense	578	1,526
Net income	443	2,222
Average assets	$ 1,708,000	$ 1,028,000