Disclosure About Fair Values of Financial Instruments - Summary of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Profits Interests
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 4,330	$ 5,779
Net gains (losses) included in earnings	(259)	(174)
Distributions received		(288)
Ending Balance	4,071	5,317
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	(259)	(174)
Investments in Limited Partnerships
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	18,742	11,191
Net gains (losses) included in earnings	(316)	746
Reclassifications	525	(800)
Contributions paid	1,283	608
Distributions received	(449)	(144)
Ending Balance	19,785	11,601
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	(316)	746
SBA Servicing Assets
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	3,811
Acquired		6,213
Originations	299	320
Net gains (losses) included in earnings	(168)	(2,730)
Ending Balance	3,942	3,803
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	$ (168)	$ (2,730)