Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair value of investments
Total investment securities	$ 199,919	$ 201,348
Level 1
Fair value of investments
Total investment securities	179,297	176,760
Level 1 | Common Stock
Fair value of investments
Total investment securities	56	60
Level 1 | Affiliated mutual funds
Fair value of investments
Total investment securities	179,241	176,700
Level 2
Fair value of investments
Total investment securities	20,622	24,588
Level 2 | Mortgage-backed securities
Fair value of investments
Total investment securities	35	46
Level 2 | Municipal bonds
Fair value of investments
Total investment securities		501
Level 2 | Corporate bonds
Fair value of investments
Total investment securities	20,587	24,041
Total | Mortgage-backed securities
Fair value of investments
Total investment securities	35	46
Total | Municipal bonds
Fair value of investments
Total investment securities		501
Total | Corporate bonds
Fair value of investments
Total investment securities	20,587	24,041
Total | Common Stock
Fair value of investments
Total investment securities	56	60
Total | Affiliated mutual funds
Fair value of investments
Total investment securities	$ 179,241	$ 176,700