Other Borrowings (Details - Textuals)	12 Months Ended
	Dec. 31, 2015 USD ($) $ / CapitalSecurity	Dec. 31, 2014 USD ($)
E TRADE Clearing [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 995,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	$ 0
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Instrument [Line Items]
Trust Preferred Securities, Years Due After Issuance	30 years
Trust Preferred Securities, Par Value | $ / CapitalSecurity	1,000
Secured Committed Line of Credit [Member] | E TRADE Clearing [Member]
Line of Credit Facility [Line Items]
Lines of Credit. Number of Creditors	2
Secured Committed Line of Credit [Member] | E TRADE Clearing [Member] | Line of Credit, Maturing June 2016 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 175,000,000
Secured Uncommitted Line of Credit [Member] | E TRADE Clearing [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 375,000,000
Unsecured Uncommitted Line of Credit Member [Member] | E TRADE Clearing [Member]
Line of Credit Facility [Line Items]
Lines of Credit. Number of Creditors	2
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Unsecured Uncommitted Line of Credit Member [Member] | E TRADE Clearing [Member] | Line of Credit, Maturing August 2016 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	250,000,000	$ 200,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	0
Revolving Credit Facility [Member] | E TRADE Clearing [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 345,000,000