Goodwill and Core Deposits and Other Intangibles - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangibles	$ 1,938,000	$ 2,047,000	$ 5,987,000
Amortization expense remainder for this year	7,800,000
Amortization expense for year 2027	6,600,000
Amortization expense for year 2028	4,200,000
Amortization expense for year 2029	4,200,000
Amortization expense for year 2030	4,200,000
Carrying amount of Company's goodwill	$ 1,398,253,000		$ 1,398,253,000	$ 1,398,253,000	$ 1,398,253,000
Impairment of goodwill				$ 0

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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+ Details

- 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.

+ References

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+ Details

- Definition

Amount of impairment loss from 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.

+ References + Details

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