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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
(Numerator)
Income available to common stockholders	$ 62,654	$ 58,903	$ 181,113	$ 159,878
(Denominator)
Weighted average shares outstanding for basic earnings per common share	33,310,290	33,097,164	33,266,315	33,015,741
Dilutive effect of stock compensation	553,839	549,385	545,955	551,376
Weighted-average shares outstanding for diluted earnings per common share	33,864,129	33,646,549	33,812,270	33,567,117
Basic earnings per share	$ 1.88	$ 1.78	$ 5.44	$ 4.84
Diluted earnings per share	$ 1.85	$ 1.75	$ 5.36	$ 4.76

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