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Goodwill and Other Intangibles - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 1,839,825	$ 207,385
Acquisition of HTLF	(2,231)	1,632,440
Goodwill	1,837,594	1,839,825
Commercial Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	1,042,577	63,113
Acquisition of HTLF	(1,339)	979,464
Goodwill	1,041,238	1,042,577
Institutional Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	76,492	76,492
Goodwill	76,492	76,492
Personal Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	720,756	67,780
Acquisition of HTLF	(892)	652,976
Goodwill	$ 719,864	$ 720,756

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