PARENT COMPANY FINANCIAL STATEMENTS (Condensed Statements Of Income For the Parent Company) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ (1,091)	$ (1,112)	$ (1,172)	$ (1,283)	$ (1,410)	$ (1,471)	$ (1,614)	$ (1,844)	$ (4,658)	$ (6,339)	$ (9,260)
Tax benefit									8,055	7,123	6,909
Net income	5,775	5,415	4,485	4,090	5,010	4,196	4,424	4,515	19,765	18,145	16,489
Preferred stock dividend and discount accretion									0	0	(972)
Net income available to common shareholders									19,765	18,145	15,517
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiary									3,200	5,500	19,500
Interest expense									(355)	(355)	(326)
Operating expenses									(631)	(381)	(405)
Tax benefit									328	224	185
Income before equity in undistributed income of the Bank									2,542	4,988	18,954
Equity in undistributed income (dividends in excess of earnings) of the Bank									17,223	13,157	(2,465)
Net income									19,765	18,145	16,489
Preferred stock dividend and discount accretion									0	0	(972)
Net income available to common shareholders									$ 19,765	$ 18,145	$ 15,517