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Goodwill and Core Deposits and Other Intangibles - Summary of Carrying Amount and Accumulated Amortization of Core Deposits and Other Intangibles (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying basis	$ 128,888	$ 128,888
Accumulated amortization	(90,608)	(88,561)
Net carrying amount	$ 38,280	$ 40,327	$ 46,630	$ 48,770

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
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-Paragraph 40
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-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

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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/2009/role/commonPracticeRef
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