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Commitments and Contingencies - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating leases:      
Operating lease right-of-use assets $ 23,544 $ 23,604  
Operating lease liabilities $ 25,351 $ 25,429  
Finance leases:      
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Bank premises and equipment, net Bank premises and equipment, net  
Finance lease right-of-use assets $ 499 $ 499  
Accumulated amortization (124) (93)  
Finance lease right-of-use assets, net 375 406  
Finance lease liabilities $ 388 $ 419 $ 419