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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 02, 2025	Jan. 31, 2025	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Finite Lived Intangible Assets [Line Items]
Goodwill			$ 1,835,298	$ 207,385	$ 207,385
Heartland Financial USA, Inc [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill		$ 1,627,913
Core deposit intangible asset		474,100
Wealth customer list		26,000
Purchased credit card relationships		$ 10,900
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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