Investment in Securities, Part I (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Available for sale securities:
Cost	$ 39,283	$ 53,850
Fair Value	88,765	97,114
Cost	169,804	185,997
Fair value	231,228	218,843
Amount Reclassified from AOCI [Abstract]
Net gain from investments - Realized gain / (loss) on sale of securities	17,688
Other operating expenses	3,650
Other Comprehensive Income (Loss), Reclassification Adjustment for Write-down of Securities Included in Net Income, before Tax	(97)
Income before income taxes	21,241
Income tax provision	(7,859)
Net income	13,382
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	275	148
Gross amounts offset in the Statements of Financial Position	0	0
Net Amounts of Assets Presented in the Statements of Financial Position	275	148
Gross Amounts Not Offset in the Statements of Financial Position, Assets [Abstract]
Financial Instruments	(155)	(132)
Cash collateral received	0	0
Net amount	120	16
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	155	132
Gross amounts offset in the Statements of Financial Position	0	0
Net Amounts of Assets Presented in the Statements of Financial Position	155	132
Gross Amounts Not Offset in the Statements of Financial Position, Liabilities [Abstract]
Financial Instruments	(155)	(132)
Cash collateral received	0	0
Net amount	0	0
Trading Securities [Member]
Trading securities:
Cost	155,572	170,070
Fair Value	186,495	183,581
Trading Securities:
Cost	5,319	2,777
Fair Value	6,178	3,136
Trading Securities [Member] \| Government obligations [Member]
Trading securities:
Cost	37,986	42,973
Fair Value	37,994	42,989
Trading Securities [Member] \| Common Stock [Member]
Trading securities:
Cost	96,225	125,697
Fair Value	124,634	138,478
Trading Securities:
Cost	5,319	2,593
Fair Value	6,023	2,867
Trading Securities [Member] \| Mutual Funds [Member]
Trading securities:
Cost	21,074	1,072
Fair Value	23,285	1,484
Trading Securities [Member] \| Other Investments [Member]
Trading securities:
Cost	287	328
Fair Value	582	630
Trading Securities:
Cost	0	184
Fair Value	155	269
Available-for-sale Securities [Member]
Available for sale securities:
Cost	14,232	15,927
Fair Value	44,733	35,262
Available-for-sale Securities [Member] \| Common Stock [Member]
Available for sale securities:
Cost	13,389	14,822
Fair Value	43,046	33,560
Available-for-sale Securities [Member] \| Mutual Funds [Member]
Available for sale securities:
Cost	843	1,105
Fair Value	1,687	1,702
Investment in Sponsored Registered Investment Companies [Member]
Available for sale securities:
Cost	25,070	37,942
Fair value	44,042	61,872
Investment in Sponsored Registered Investment Companies [Member] \| Trading Securities [Member]
Trading securities:
Cost	19	19
Fair Value	10	20
Investment in Sponsored Registered Investment Companies [Member] \| Trading Securities [Member] \| Mutual Funds [Member]
Trading securities:
Cost	19	19
Fair Value	10	20
Investment in Sponsored Registered Investment Companies [Member] \| Available-for-sale Securities [Member]
Available for sale securities:
Cost	25,051	37,923
Fair Value	44,032	61,852
Investment in Sponsored Registered Investment Companies [Member] \| Available-for-sale Securities [Member] \| Mutual Funds [Member]
Available for sale securities:
Cost	1,951	2,055
Fair Value	3,408	3,341
Investment in Sponsored Registered Investment Companies [Member] \| Available-for-sale Securities [Member] \| Closed end Funds [Member]
Available for sale securities:
Cost	23,100	35,868
Fair Value	$ 40,624	$ 58,511

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