Mergers and Acquisitions - Schedule of Changes in Purchase Price of Assets Acquired and The Liabilities Assumed (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2025 USD ($)
Change In Fair Value Of Net Assets Acquired [Abstract]
Goodwill recognized as of June 30, 2025	$ 1,600,000
Premier Financial Corporation [Member]
Business Combination [Line Items]
Goodwill recognized as of March 31, 2025	483,397
Change In Fair Value Of Net Assets Acquired [Abstract]
Investment securities	(6)
Loans held for sale	(28,019)
Net portfolio loans	36,843
Intangible assets	6,892
Premises and equipment	(4,345)
Deferred tax assets	(1,364)
Accrued income and other assets	(1,875)
Borrowings	0
Accrued expenses and other liabilities	(904)
Fair value of net assets acquired	7,222
Decrease in goodwill recognized	(7,222)
Goodwill recognized as of June 30, 2025	$ 476,175