BUSINESS ACQUISITION BUSINESS ACQUISITION (Details - Changes in Contingent Consideration)				3 Months Ended					9 Months Ended
	Sep. 19, 2017 USD ($) payment	Jun. 14, 2017 USD ($) payment	Nov. 17, 2016 USD ($) payment	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Nov. 16, 2016 USD ($)
Business Acquisition [Line Items]
Contingent consideration payments									$ 26,600,000	$ 0
Current contingent consideration					$ 7,327,000				7,327,000		$ 46,576,000
Non-current contingent consideration					9,019,000				9,019,000		$ 11,273,000
Change in fair value of contingent consideration					2,105,000			$ 2,501,000	1,197,000	20,640,000
CompareCards
Business Acquisition [Line Items]
Initial cash consideration to acquire business			$ 80,700,000
Number of payments | payment			2
Contingent consideration range, maximum												$ 45,000,000
Total preliminary purchase price			$ 103,800,000
Contingent consideration												23,100,000
Contingent consideration payments						$ 22,500,000	$ 22,500,000
Change in fair value of contingent consideration									700,000
DepositAccounts
Business Acquisition [Line Items]
Initial cash consideration to acquire business		$ 24,000,000							0	25,000,000
Number of payments | payment		7
Contingent consideration range, maximum		$ 9,000,000
Total preliminary purchase price		29,000,000
Contingent consideration		5,000,000
Contingent consideration payment								$ 1,000,000
Contingent consideration payments					1,000,000
Current contingent consideration					4,400,000				4,400,000
Change in fair value of contingent consideration					100,000				1,400,000
Value of potential contingent consideration payments based on specified increases in federal funds interest rates		1,000,000
One-time contingent consideration performance payment		$ 2,000,000
SnapCap
Business Acquisition [Line Items]
Initial cash consideration to acquire business	$ 11,900,000								10,000	$ 11,886,000
Number of payments | payment	3
Total preliminary purchase price	$ 18,200,000
Contingent consideration	6,300,000				5,200,000				5,200,000
Current contingent consideration					2,900,000				2,900,000
Non-current contingent consideration					2,300,000				2,300,000
Change in fair value of contingent consideration					$ 1,100,000				$ 1,800,000
Contingent earnout | CompareCards
Business Acquisition [Line Items]
Contingent consideration range, maximum												$ 22,500,000
Contingent earnout | SnapCap
Business Acquisition [Line Items]
Contingent consideration range, minimum	0
Contingent consideration range, maximum	$ 3,000,000
Cash Flows from Financing Activities | CompareCards
Business Acquisition [Line Items]
Contingent consideration payments						600,000
Cash Flows from Operating Activities | CompareCards
Business Acquisition [Line Items]
Contingent consideration payments						$ 21,900,000
Subsequent Event | DepositAccounts
Business Acquisition [Line Items]
Contingent consideration payments				$ 1,000,000