Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Total	$ 81,325	$ 84,423
Core deposit premiums:
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	147,477	173,305
Accumulated amortization	(73,776)	(96,915)
Total	73,701	76,390	$ 87,575
Books of business and other intangibles:
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	22,068	22,068
Accumulated amortization	(14,444)	(14,035)
Total	$ 7,624	$ 8,033	$ 9,667