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 (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Goodwill
Goodwill	$ 1,398,253		$ 1,398,253	$ 1,398,253
Core Deposit Intangibles
Balance, beginning of period	32,293	$ 40,327	38,280
Amortization expense	(1,938)	(2,047)	(5,987)
Balance, end of year	$ 30,355	$ 38,280	$ 32,293

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 (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Dec. 31, 2025

Dec. 31, 2024

Goodwill

Goodwill

$ 1,398,253

Core Deposit Intangibles

Balance, beginning of period

32,293

$ 40,327

38,280

Amortization expense

(1,938)

(2,047)

(5,987)

Balance, end of year

$ 30,355

$ 38,280

$ 32,293

- 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.

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- Definition

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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