Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
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| Finite-Lived Intangible Assets [Line Items] | |||
| Goodwill, Beginning balance | $ 3,503,127 | $ 3,503,129 | $ 3,503,129 |
| Goodwill, Ending balance | 3,822,283 | 3,503,127 | |
| Core Deposit Intangibles, Beginning balance | 51,605 | 66,047 | 66,047 |
| Core Deposit Intangibles, Amortization | (5,259) | $ (3,641) | (14,442) |
| Core Deposit Intangibles, Ending balance | 111,243 | 51,605 | |
| Lone Star Merger [Member] | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Goodwill, Measurement period adjustment | $ (2) | ||
| American Merger [Member] | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Goodwill, Merger | 185,042 | ||
| Core Deposit Intangibles, Merger | 31,103 | ||
| Southwest Merger [Member] | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Goodwill, Merger | 134,114 | ||
| Core Deposit Intangibles, Merger | $ 33,794 | ||
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of increase (decrease) from measurement period adjustment of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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