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Commitments and Contingencies - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Operating leases:    
Operating lease right-of-use assets $ 24,559 $ 25,612
Operating lease liabilities 25,993 27,062
Finance leases:    
Finance lease right-of-use assets $ 62 $ 365
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Bank premises and equipment, net Bank premises and equipment, net
Accumulated amortization $ (31) $ (307)
Finance lease right-of-use assets, net 31 58
Finance lease liabilities $ 30 $ 58