Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investment Securities
Available for sale securities, Amortized cost	$ 103,860	$ 99,907
Available for sale securities, Unrealized gains	3,998	2,910
Available for sale securities, Unrealized losses	(1,093)	(5,481)
Available for sale securities, Fair value	106,765	97,336
Trading securities
Trading securities, Fair value	69,377	36,926
Investment securities	176,142	134,262
Mortgage-backed securities
Investment Securities
Available for sale securities, Amortized cost	9	9
Available for sale securities, Unrealized gains	1	2
Available for sale securities, Fair value	10	11
Trading securities
Trading securities, Fair value	44	63
Municipal bonds
Investment Securities
Available for sale securities, Amortized cost		2,549
Available for sale securities, Unrealized losses		(13)
Available for sale securities, Fair value		2,536
Trading securities
Trading securities, Fair value	501	500
Corporate bonds
Investment Securities
Available for sale securities, Amortized cost	30,408	45,893
Available for sale securities, Unrealized gains	248	170
Available for sale securities, Unrealized losses	(3)	(89)
Available for sale securities, Fair value	30,653	45,974
Trading securities
Trading securities, Fair value	12,112	17,319
Common Stock
Trading securities
Trading securities, Fair value	37	37
Affiliated mutual funds
Investment Securities
Available for sale securities, Amortized cost	73,443	51,456
Available for sale securities, Unrealized gains	3,749	2,738
Available for sale securities, Unrealized losses	(1,090)	(5,379)
Available for sale securities, Fair value	76,102	48,815
Trading securities
Trading securities, Fair value	$ 56,683	$ 19,007

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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