Goodwill and Other Intangible Assets - Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Total	$ 102,748	$ 106,235
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	153,496	153,496
Accumulated amortization	(62,778)	(59,634)
Total	90,718	93,862	$ 97,363
Books of Business Intangible
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	19,937	19,937
Accumulated amortization	(7,907)	(7,564)
Total	$ 12,030	$ 12,373	$ 13,747