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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	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying basis	$ 128,888	$ 128,888
Accumulated amortization	(86,493)	(80,118)
Net carrying amount	$ 42,395	$ 48,770	$ 51,023	$ 58,455

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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
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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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