Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) site $ / shares shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Aug. 21, 2007 shares
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements	$ 82,068,000	$ 78,183,000
Number of sites leased under non-cancelable operating leases | site	48
Rent expense under operating leases	$ 5,885,000	6,082,000	$ 6,241,000
Rent expense offset by rent income	$ 44,000	220,000	$ 217,000
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.
Cost of settlement	$ 1,469,000	1,450,000
Agreement approval date	Jan. 12, 2018
Litigation contingency	$ 1,450,000	$ 1,450,000
Class B common stock of Visa Inc. | shares	22,955,963	22,867,802		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	$ 114.02
Value of unredeemed Class A equivalent shares	$ 2,518,000