Other Noninterest (Loss) Income and Other Noninterest Expense - Summary of Other Noninterest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Other Income and Expenses [Abstract]
Fund management fees	$ 3,574		$ 2,822		$ 9,888		$ 8,531
Service-based fee income	2,180		1,901		6,459		5,706
(Losses) gains on revaluation of foreign currency instruments	(12,640)	[1]	8,069	[1]	(12,347)	[1]	444	[1]
Other	1,525	[2]	4,369	[2]	10,601	[2]	9,667	[2]
Total other noninterest (loss) income	$ (5,361)		$ 17,161		$ 14,601		$ 24,348

[1] Represents the revaluation of foreign currency denominated financial instruments issued and held by us, primarily loans, deposits and cash.

[2] Includes dividends on FHLB/FRB stock, correspondent bank rebate income and other fee income.