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Goodwill and Core Deposits and Other Intangibles - Summary of Changes in Carrying Amount and Accumulated Amortization of Company's Goodwill and Core Deposits and Other Intangibles (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Goodwill
Balance, beginning of period			$ 1,398,253		$ 1,398,253
Balance, end of period	$ 1,398,253		1,398,253	$ 1,398,253
Core Deposit Intangibles
Balance, beginning of period			48,770	53,500	58,455
Amortization expense	(2,140)	$ (2,478)	(4,280)	(4,730)	(4,955)
Balance, end of year	$ 44,490	$ 53,500	$ 44,490	$ 48,770	$ 53,500

X

- 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.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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