Investment Securities (Details) (USD $)	3 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Available for sale securities:
Amortized cost	$ 126,764,000	$ 102,286,000
Unrealized gains	5,200,000	5,961,000
Unrealized losses	(898,000)	(957,000)
Fair value	131,066,000	107,290,000
Trading securities:
Fair value	68,853,000	94,058,000
Investment securities	199,919,000	201,348,000
Purchases of trading securities	27,300,000
Sales and maturities of trading securities	27,700,000
Mortgage-backed securities
Available for sale securities:
Amortized cost		8,000
Unrealized gains		1,000
Fair value		9,000
Trading securities:
Fair value	35,000	37,000
Municipal bonds
Trading securities:
Fair value		501,000
Corporate bonds
Available for sale securities:
Amortized cost	11,190,000	14,568,000
Unrealized gains	28,000	61,000
Fair value	11,218,000	14,629,000
Trading securities:
Fair value	9,369,000	9,412,000
Common Stock
Trading securities:
Fair value	56,000	60,000
Affiliated mutual funds
Available for sale securities:
Amortized cost	115,574,000	87,710,000
Unrealized gains	5,172,000	5,899,000
Unrealized losses	(898,000)	(957,000)
Fair value	119,848,000	92,652,000
Trading securities:
Fair value	$ 59,393,000	$ 84,048,000

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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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Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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The cash inflow associated with the sale, maturities, repayments and calls of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Amount of accumulated unrealized gain before deducting unrealized loss on investments in available-for-sale securities impacting investments.

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Amount of accumulated unrealized loss before deducting unrealized gain on investments in available-for-sale securities impacting investments.

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