Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision for loan losses	$ 13,662	$ 13,617
Write-downs of other real estate owned	962	915
Deferred compensation	2,237	1,995
Stock-based compensation	2,934	2,707
Investments in partnership interests	1,170	162
Other	1,479	832
Gross deferred tax assets	22,444	20,228
Unrealized net gains on securities	(2,104)	(3,402)
Premium on securities of banks acquired	(800)	(806)
Intangibles	(2,561)	(2,397)
Basis difference related to tax credits	(1,620)	(775)
Depreciation	(5,975)	(4,443)
Leveraged lease	(2,282)	(2,607)
Other	(257)	(507)
Gross deferred tax liabilities	(15,597)	(14,937)
Net deferred tax asset	$ 6,846	$ 5,291