Income Taxes - Components of Deferred Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for loan losses	$ 8,258	$ 12,305
Deferred compensation	276	292
Deferred gain on interest rate swap	686	766
Unrealized loss on interest rate swap	1,042	711
Nonaccrual interest	891	175
Other real estate owned	3,803	2,711
Capitalized costs, deferred gains and other	1,155	558
Deferred tax assets	16,111	17,518
Deferred tax liabilities:
Depreciation and amortization	4,758	5,106
Intangible assets	60	340
Deferred gain on FDIC-assisted transactions	17,256	16,946
Unrealized gain on securities available for sale	3,570	3,468
Deferred tax liabilities	25,644	25,860
Net deferred tax asset (liability)	$ (9,533)	$ (8,342)