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Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Core deposit premiums, beginning of period |  |  | $ 128,951 |  |
Amortization | $ (4,097) | $ (4,225) | (12,291) | $ (11,807) |
Core deposit premiums, end of period | 116,660 |  | 116,660 |  | $ 128,951
Spirit of Texas Bancshares, Inc. |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Core deposit premiums, beginning of period |  |  | 36,500 |  |
Core deposit premiums, end of period |  |  |  |  | 36,500
Core Deposit Premium |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Core deposit premiums, beginning of period |  |  | 116,016 | 93,862 | 93,862
Acquisitions |  |  | 0 |  | 36,500
Amortization |  |  | (11,066) |  | (14,346)
Core deposit premiums, end of period | 104,950 |  | 104,950 |  | 116,016
Books of Business Intangible |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Core deposit premiums, beginning of period |  |  | 12,935 | $ 12,373 | 12,373
Acquisitions |  |  | 0 |  | 2,131
Amortization |  |  | (1,225) |  | (1,569)
Core deposit premiums, end of period | $ 11,710 |  | $ 11,710 |  | $ 12,935

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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. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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