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Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | $ 347,567 | $ 304,045
Level 1 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 70,947 | 43,177
Level 2 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 276,620 | 260,868
Level 3 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total |  |
U.S. Treasury securities [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 250 | 250
U.S. Treasury securities [Member] | Level 1 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 250 | 250
U.S. Treasury securities [Member] | Level 3 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total |  |
Obligations of U.S. government sponsored enterprises [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 130,674 | 124,636
Obligations of U.S. government sponsored enterprises [Member] | Level 1 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 40,727 | 42,927
Obligations of U.S. government sponsored enterprises [Member] | Level 2 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 89,947 | 81,709
Obligations of U.S. government sponsored enterprises [Member] | Level 3 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total |  |
Corporate debt securities [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 133,536 | 132,862
Corporate debt securities [Member] | Level 2 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 133,536 | 132,862
Corporate debt securities [Member] | Level 3 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total |  |
Commercial Paper [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 29,970 |
Commercial Paper [Member] | Level 1 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 29,970 |
Commercial Paper [Member] | Level 3 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total |  |
Foreign corporate debt securities [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 33,580 | 27,229
Foreign corporate debt securities [Member] | Level 2 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 33,580 | 27,229
Foreign corporate debt securities [Member] | Level 3 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total |  |
Commercial mortgage-backed securities [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 19,557 | 19,068
Commercial mortgage-backed securities [Member] | Level 2 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total | 19,557 | 19,068
Commercial mortgage-backed securities [Member] | Level 3 [Member] |  |
Schedule of investments in accordance with fair value measurement |  |
Fair value measurement of class of securities Total |  |

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