Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available for sale securities:
Amortized cost	$ 102,286	$ 103,860
Unrealized gains	5,961	3,998
Unrealized losses	(957)	(1,093)
Fair value	107,290	106,765
Trading securities:
Fair value	94,058	69,377
Investment securities	201,348	176,142
Mortgage-backed securities
Available for sale securities:
Amortized cost	8	9
Unrealized gains	1	1
Fair value	9	10
Trading securities:
Fair value	37	44
Municipal bonds
Trading securities:
Fair value	501	501
Corporate bonds
Available for sale securities:
Amortized cost	14,568	30,408
Unrealized gains	61	248
Unrealized losses		(3)
Fair value	14,629	30,653
Trading securities:
Fair value	9,412	12,112
Common Stock
Trading securities:
Fair value	60	37
Affiliated mutual funds
Available for sale securities:
Amortized cost	87,710	73,443
Unrealized gains	5,899	3,749
Unrealized losses	(957)	(1,090)
Fair value	92,652	76,102
Trading securities:
Fair value	$ 84,048	$ 56,683