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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended
	Sep. 02, 2025	Jan. 31, 2025	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Finite Lived Intangible Assets [Line Items]
Goodwill			$ 1,837,594	$ 1,839,825	$ 207,385
Heartland Financial USA, Inc [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill		$ 1,630,209
Core deposit intangible asset		474,100
Wealth customer list		26,000
Purchased credit card relationships		$ 10,900
Adjustment to goodwill			$ 2,200
Healthcare Savings Account Business [Member]
Finite Lived Intangible Assets [Line Items]
Deposit acquired	$ 32,500
Core deposit intangible asset	$ 4,800

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