Other Noninterest Income and Other Noninterest Expense Summary of Other Noninterest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income and Expenses [Abstract]
Client services	$ 8,181	$ 6,910	$ 4,594
Data processing services	7,895	5,876	4,811
Tax credit fund amortization	6,436	3,911	4,474
Telephone	6,258	6,528	5,835
Postage and supplies	2,462	2,482	2,162
Dues and publications	1,745	2,067	1,570
Net gain from note repurchases and termination of corresponding interest rate swaps	0	0	(3,123)	[1]
Other	8,950	8,188	10,499
Total other noninterest expense	$ 41,927	$ 35,962	$ 30,822

[1] Represents gains from the repurchase of $109 million of our 5.70% Senior Notes and $204 million of our 6.05% Subordinated Notes and the termination of the corresponding portions of interest rate swaps in 2011. For more information, see Note 11–"Short-Term Borrowings and Long-Term Debt."