Employee Compensation and Benefit Plans - Schedule of Change in Benefit Obligation, Plan Assets and Funded Status for Pension Plans and Gratuity Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unfunded status recognized in Other liabilities	$ (5,331)	$ (4,904)
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	54,603	49,122
Fair value of plan assets	41,220	36,439
Unfunded status recognized in Other liabilities	(13,383)	(12,683)
Amounts recognized in Accumulated other comprehensive income	6,864	3,422
Gratuity Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	5,370	4,941
Fair value of plan assets	39	37
Unfunded status recognized in Other liabilities	$ (5,331)	$ (4,904)