Other Noninterest (Loss) Income and Other Noninterest Expense - Summary of Other Noninterest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Income and Expenses [Abstract]
Client services	$ 3,549	$ 2,359
Telephone	1,959	1,748
Data processing services	1,833	2,227
Postage and supplies	765	769
Dues and publications	585	497
Other	4,907	1,562
Total other noninterest expense	$ 13,598	$ 9,162	[1]

[1] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 1 - "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.