Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |
Jan. 31, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Summary Of Significant Accounting Policies [Line Items] | |||
| Interest bearing amounts held at other financial institutions | $ 121.0 | $ 118.0 | |
| Heartland Financial USA Inc [Member] | |||
| Summary Of Significant Accounting Policies [Line Items] | |||
| Description of acquired entity | On January 31, 2025 (Acquisition Date), the Company acquired Heartland Financial USA, Inc. (HTLF) pursuant to an Agreement and Plan of Merger, dated as of April 28, 2024. | ||
| Acquisition date | Jan. 31, 2025 | ||
| Name of acquired entity | Heartland Financial USA, Inc. (HTLF) | ||
| Date of merger | Apr. 28, 2024 |
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- Definition Interest bearing other accounts. No definition available.
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- Definition Summary Of Significant Accounting Policies [Line Items] No definition available.
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- Definition Date when acquisition agreement is executed in business combination, in YYYY-MM-DD format. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Description of acquiree in business combination. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Date when acquirer obtains control of acquiree in business combination, in YYYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Name of acquiree in business combination. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Details
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