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Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Liabilities |  |  |  |
Preliminary goodwill |  | $ 1,835,298 | $ 207,385 | $ 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 | 3,653,860 |  |  |
Interest-bearing due from banks | 965,003 |  |  |
Cash and due from banks | 174,985 |  |  |
Premises and equipment, net | 175,127 |  |  |
Identifiable intangible assets | 511,021 | 511,000 |  |
Other assets | 902,458 |  |  |
Total assets acquired | 16,117,165 |  |  |
Liabilities |  |  |  |
Noninterest-bearing deposits | 3,761,997 |  |  |
Interest-bearing deposits | 10,586,989 |  |  |
Long-term debt | 278,018 |  |  |
Other liabilities | 198,945 |  |  |
Total liabilities assumed | 14,825,949 |  |  |
Net identifiable assets acquired | 1,291,216 |  |  |
Preliminary goodwill | 1,627,913 |  |  |
Net assets acquired | 2,919,129 | (22,600) |  |
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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