Commitments and Contingencies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Customer	Dec. 31, 2018 USD ($)
Concentration Risk [Line Items]
Commitment letters expiration period (in days)	90 days
Commitments for on-balance sheet instruments	$ 16,900	$ 2,800
Maximum retained credit exposure	7,500
Future minimum lease payments receivable under non-cancelable operating leases	$ 85,094
Thirteen Relationships
Concentration Risk [Line Items]
Number of relationships that have retained unguaranteed exposure | Customer	24
Retained credit exposure	$ 259,400
Retained exposure, amount disbursed	178,800
Four Relationships
Concentration Risk [Line Items]
Future minimum lease payments receivable under non-cancelable operating leases	$ 61,100