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Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 31, 2025	Mar. 31, 2025	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Liabilities
Preliminary goodwill			$ 1,837,594	$ 1,839,825	$ 207,385
Consideration
Stock based compensation as consideration for acquisition		$ 20,389
Heartland Financial USA Inc [Member]
Assets
Loans, net of allowance for credit losses on loans	$ 9,734,711
Investment securities	3,648,445
Interest-bearing due from banks	965,003
Cash and due from banks	174,985
Premises and equipment, net	174,579
Identifiable intangible assets	511,021
Other assets	906,712
Total assets acquired	16,115,456
Liabilities
Noninterest-bearing deposits	3,761,997
Interest-bearing deposits	10,586,989
Long-term debt	278,018
Other liabilities	199,532
Total liabilities assumed	14,826,536
Net identifiable assets acquired	1,288,920
Preliminary goodwill	1,630,209
Net assets acquired	2,919,129
Consideration
Stock based compensation as consideration for acquisition	20,389
Fair value of total consideration transferred	2,919,129
Common Stock [Member]
Consideration
Fair value of total consideration transferred		2,783,510
Common Stock [Member] | Heartland Financial USA Inc [Member]
Consideration
Company's common shares issued	$ 23,609
Purchase price per share of the Company's common stock	$ 117.9
Fair value of total consideration transferred	$ 2,783,510
Preferred Stock [Member]
Consideration
Fair value of total consideration transferred		$ 115,230
Preferred Stock [Member] | Heartland Financial USA Inc [Member]
Consideration
Purchase price per share of the Company's common stock	$ 25.05
Fair value of total consideration transferred	$ 115,230

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