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Leases - Minimum Annual Rental Payments for Bank facilities Due Under Non-cancelable Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
2021 $ 6,758  
2021 9,145 $ 8,757
2022 9,276 8,871
2023 9,119 9,006
2024 8,479 8,847
2025   8,212
Thereafter 22,898 23,547
Total minimum payments required 65,675 67,240
Less: implied interest 7,595 8,140
Total lease obligations $ 58,080 $ 59,100