Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
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| Intangible Asset, Finite-Lived [Line Items] | |||||
| Goodwill, Beginning balance | $ 3,503,127 | $ 3,503,129 | $ 3,503,129 | ||
| Goodwill, Ending balance | $ 3,823,920 | 3,823,920 | 3,503,127 | ||
| Core Deposit Intangibles, Beginning balance | 51,605 | 66,047 | 66,047 | ||
| Core Deposit Intangibles, Amortization | (5,661) | $ (3,610) | (10,920) | $ (7,251) | (14,442) |
| Core Deposit Intangibles, Ending balance | $ 105,582 | 105,582 | 51,605 | ||
| Lone Star Merger [Member] | |||||
| Intangible Asset, Finite-Lived [Line Items] | |||||
| Goodwill, Measurement period adjustment | $ (2) | ||||
| American Merger [Member] | |||||
| Intangible Asset, Finite-Lived [Line Items] | |||||
| Goodwill, Merger | 185,941 | ||||
| Core Deposit Intangibles, Merger | 31,103 | ||||
| Southwest Merger [Member] | |||||
| Intangible Asset, Finite-Lived [Line Items] | |||||
| Goodwill, Merger | 134,852 | ||||
| Core Deposit Intangibles, Merger | $ 33,794 | ||||
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- Definition Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. 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/2009/role/commonPracticeRef
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- Definition Amount, after accumulated amortization, of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of increase in finite-lived intangible asset acquired in business combination, asset acquisition, and from joint venture formation. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. 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/disclosureRef
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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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