Commitments and Contingencies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) site $ / shares shares	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) shares	Aug. 21, 2007 shares
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements	$ 91,860,000		$ 82,068,000
Number of sites leased under non-cancelable operating leases | site	41
Rent expense under operating leases	$ 921,000	$ 1,047,000
Rent expense offset by rent income	$ 10,000	$ 13,000
Commitment expiration date	One year or less or other termination clauses and may require payment of a fee.
Letters of credit, issue period	One year or less
Overdraft privilege receivable criteria	All holders of such accounts who bring their accounts to a positive balance at least once every thirty days receive the overdraft privilege.
Class B common stock of Visa Inc. | shares	22,956,323		22,955,963	15,814,662
Conversion ratio	1.648265
Common Class B [Member]
Conversion of Stock [Line Items]
Class B common stock of Visa Inc. | shares	13,396
Common Class A [Member]
Conversion of Stock [Line Items]
The value of the Class A shares | $ / shares	$ 119.62
Value of unredeemed Class A equivalent shares	$ 2,641,000