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Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Finite-lived Intangible Assets [Roll Forward] |  |  |
Core deposit premiums, beginning of period | $ 106,235 |  |
Amortization of intangibles | (15,915) | $ (13,494) | $ (13,495)
Core deposit premiums, end of period | 128,951 | 106,235 |
Spirit of Texas Bancshares, Inc. |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Core deposit premiums, end of period | 36,500 |  |
Triumph Bancshares Inc |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Core deposit premiums, beginning of period | 5,100 |  |
Core deposit premiums, end of period |  | 5,100 |
Landmark Community Bank |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Core deposit premiums, beginning of period | 4,200 |  |
Core deposit premiums, end of period |  | 4,200 |
Core Deposit Premium |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Core deposit premiums, beginning of period | 93,862 | 97,363 |
Acquisitions | 36,500 | 9,295 |
Disposition of intangible asset | 0 | (674) |
Amortization of intangibles | (14,346) | (12,122) | (12,100)
Core deposit premiums, end of period | 116,016 | 93,862 | 97,363
Books of Business Intangible |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Core deposit premiums, beginning of period | 12,373 | 13,747 |
Acquisitions | 2,131 | 0 |
Amortization of intangibles | (1,569) | (1,374) | (1,400)
Core deposit premiums, end of period | $ 12,935 | $ 12,373 | $ 13,747

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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