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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Net interest income	$ 107,020	$ 108,159	$ 111,057	$ 109,536	$ 113,016		$ 92,820	$ 72,688	$ 70,521	$ 435,772	$ 349,045	$ 278,930
Provision for loan losses	0	1,500	2,000	1,500		$ 3,000	500	(1,000)	(1,000)	5,000	1,500	(8,500)
Net earnings	$ 51,281	$ 50,423	$ 54,481	$ 51,642	$ 43,159		$ 38,558	$ 35,373	$ 34,913	$ 207,827	$ 152,003	$ 104,411
Basic earnings per common share	$ 0.37	$ 0.36	$ 0.39	$ 0.37	$ 0.31		$ 0.30	$ 0.32	$ 0.32	$ 1.48	$ 1.25	$ 0.95
Diluted earnings per common share	$ 0.37	$ 0.36	$ 0.39	$ 0.37	$ 0.31		$ 0.30	$ 0.32	$ 0.32	$ 1.48	$ 1.24	$ 0.95

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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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