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Employee Compensation and Benefit Plans - Schedule of Change in Benefit Obligation, Plan Assets and Funded Status for Pension Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Benefit obligation $ 58,965 $ 54,603
Fair value of plan assets 46,303 41,220
Unfunded status recognized in Other liabilities (12,662) (13,383)
Amounts recognized in Accumulated other comprehensive income 8,484 6,864
Gratuity Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Benefit obligation 6,091 5,370
Fair value of plan assets 40 39
Unfunded status recognized in Other liabilities $ (6,051) $ (5,331)