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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Selected Quarterly Financial Information [Abstract]
Net interest income	$ 414,550	$ 416,053	$ 435,772
Provision for loan losses	(25,500)	23,500	5,000
Net earnings	$ 212,521	$ 177,159	$ 207,827
Basic earnings per common share	$ 1.57	$ 1.30	$ 1.48
Diluted earnings per common share	$ 1.56	$ 1.30	$ 1.48

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

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