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Goodwill and Other Intangibles - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 207,385
Acquisition of HTLF	1,627,913
Goodwill	1,835,298
Commercial Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	63,113
Acquisition of HTLF	976,748
Goodwill	1,039,861
Institutional Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	76,492
Goodwill	76,492
Personal Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	67,780
Acquisition of HTLF	651,165
Goodwill	$ 718,945

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