Funds Held for Customers - Additional Information (Details) - USD ($)	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Funds Held For Customers [Line Items]
Amortized Cost	$ 428,814,000	$ 437,979,000
Fair value	428,975,000	438,407,000
Short term marketable debt realized gains or losses	0		$ 0
Accrued Interest Receivable
Funds Held For Customers [Line Items]
Amortized Cost	2,300,000	1,900,000
Fair value	$ 2,300,000	$ 1,900,000