Income Taxes Deferred Tax (Liabilities) Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Allowance for loan losses	$ 69,616	$ 53,953
Net unrealized losses on available-for-sale securities	27,686	0
Share-based compensation expense	14,535	11,478
Net operating loss	9,682	8,175
Loan fee income	7,804	10,356
State income taxes	6,194	7,042
Net unrealized losses on foreign currency translation	5,228	0
Other accruals not currently deductible	4,869	2,205
Premises and equipment and other intangibles	734	0
Research and development credit	324	364
Other	36	16
Deferred tax assets	146,708	93,589
Valuation allowance	(10,006)	(8,539)
Net deferred tax assets after valuation allowance	136,702	85,050
Deferred tax liabilities:
Nonmarketable securities	(55,921)	(23,363)
Derivative equity warrant assets	(10,344)	(5,566)
FHLB stock dividend	(1,236)	(1,252)
Net unrealized gains on available-for-sale securities	0	(74,983)
Premises and equipment and other intangibles	0	(5,466)
Other	(964)	0
Deferred tax liabilities	(68,465)	(110,630)
Net deferred tax (liabilities) assets	$ 68,237	$ (25,580)