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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]
Net interest income	$ 63,258	$ 65,917	$ 62,758	$ 61,009	$ 61,175	$ 61,238	$ 57,159	$ 56,942	$ 252,942	$ 236,514	$ 216,266
(Recapture of) Provision for Loan Losses	(1,100)	(2,500)	(2,000)	0	0	(1,000)	(7,600)	(7,500)	(5,600)	(16,100)	(16,750)
Net earnings	$ 28,613	$ 27,886	$ 26,813	$ 15,833	$ 25,581	$ 24,295	$ 25,484	$ 28,661	$ 99,145	$ 104,021	$ 95,608
Basic earnings per common share	$ 0.27	$ 0.26	$ 0.25	$ 0.15	$ 0.24	$ 0.23	$ 0.24	$ 0.27	$ 0.93	$ 0.98	$ 0.91
Diluted earnings per common share	$ 0.27	$ 0.26	$ 0.25	$ 0.15	$ 0.24	$ 0.23	$ 0.24	$ 0.27	$ 0.93	$ 0.98	$ 0.91

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.