Other Noninterest Income - Components of Other Noninterest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Income from bank owned life insurance	$ 2,357	$ 2,809	$ 4,671	$ 6,108
Credit related fees	2,834	1,533	5,566	2,974
Income from derivatives	481	1,408	1,240	2,039
Gain/(loss) on sale of assets	(217)	162	1,465	476
Safety deposit box income	443	462	956	1,013
Other miscellaneous	2,714	2,281	5,141	4,513
Total other noninterest income	$ 8,612	$ 8,655	$ 19,039	$ 17,123