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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, 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
Selected Quarterly Financial Information [Abstract]
Net interest income	$ 55,109	$ 53,973	$ 52,595	$ 54,589	$ 55,644	$ 59,744	$ 462,960	$ 58,602	$ 216,266	$ 236,950	$ 234,681
Provision for loan losses	(6,800)	(3,750)	(6,200)						(16,750)		7,068
Net earnings	$ 25,288	$ 24,239	$ 24,466	$ 21,615	$ 22,136	$ 9,257	$ 23,619	$ 22,268	$ 95,608	$ 77,280	$ 81,733
Basic earnings per common share	$ 0.24	$ 0.23	$ 0.23	$ 0.21	$ 0.21	$ 0.09	$ 0.23	$ 0.21	$ 0.91	$ 0.74	$ 0.77
Diluted earnings per common share	$ 0.24	$ 0.23	$ 0.23	$ 0.21	$ 0.21	$ 0.09	$ 0.23	$ 0.21	$ 0.91	$ 0.74	$ 0.77

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