Basis and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Opening Balance Sheet Adjustment - ASC 842, net of taxes		$ 2,592
Accounting Standards Update 2016-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Opening Balance Sheet Adjustment - ASC 842, net of taxes		$ 2,592	$ 2,600
Minimum | Credit Card Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Merchant fee percent	3.00%
Maximum | Credit Card Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Merchant fee percent	25.00%