Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair value of investments
Total investment securities	$ 217,352	$ 201,348
Level 1
Fair value of investments
Total investment securities	211,303	176,760
Level 1 | Common Stock
Fair value of investments
Total investment securities	58	60
Level 1 | Affiliated mutual funds
Fair value of investments
Total investment securities	211,245	176,700
Level 2
Fair value of investments
Total investment securities	6,049	24,588
Level 2 | Mortgage-backed securities
Fair value of investments
Total investment securities	34	46
Level 2 | Municipal bonds
Fair value of investments
Total investment securities		501
Level 2 | Corporate bonds
Fair value of investments
Total investment securities	6,015	24,041
Total | Mortgage-backed securities
Fair value of investments
Total investment securities	34	46
Total | Municipal bonds
Fair value of investments
Total investment securities		501
Total | Corporate bonds
Fair value of investments
Total investment securities	6,015	24,041
Total | Common Stock
Fair value of investments
Total investment securities	58	60
Total | Affiliated mutual funds
Fair value of investments
Total investment securities	$ 211,245	$ 176,700