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Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Contractual maturity of debt securities |  |  |
Total | $ 540,475 | $ 614,977 | $ 607,046
Held for Investment [Member] | Fair Value [Member] |  |  |
Contractual maturity of debt securities |  |  |
Within one year | 4,069 |  |
After one year but within five years | 9,484 |  |
After five years but within ten years | 2,878 |  |
After ten years | 649 |  |
Total | 17,080 |  |
Held for Investment [Member] | Amortized Cost [Member] |  |  |
Contractual maturity of debt securities |  |  |
Within one year | 4,000 |  |
After one year but within five years | 9,355 |  |
After five years but within ten years | 2,825 |  |
After ten years | 589 |  |
Total | 16,769 |  |
Available for Sale [Member] | Fair Value [Member] |  |  |
Available for Sale |  |  |
Within one year | 118,531 |  |
After one year but within five years | 255,416 |  |
After five years but within ten years | 43,218 |  |
After ten years | 96,185 |  |
Total debt securities | 513,350 |  |
Equity securities | 10,356 |  |
Total | 523,706 |  |
Available for Sale [Member] | Amortized Cost [Member] |  |  |
Available for Sale |  |  |
Within one year | 117,905 |  |
After one year but within five years | 252,639 |  |
After five years but within ten years | 41,284 |  |
After ten years | 93,419 |  |
Total debt securities | 505,247 |  |
Equity securities | 8,145 |  |
Total | $ 513,392 |  |

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