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Bank subsidiary (Details 4) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Available-for-sale securities |  |
Amortized cost | $ 621,394 | $ 607,918
Gross unrealized gains | 17,882 | 16,438
Gross unrealized losses | (164) | (25)
Estimated fair value | 639,112 | 624,331
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Gross unrealized losses, less than 12 months | (164) | (25)
Fair value, less than 12 months | 28,405 | 31,986
Federal agency obligations |  |
Available-for-sale securities |  |
Amortized cost | 208,255 | 218,342
Gross unrealized gains | 3,193 | 2,393
Gross unrealized losses |  | (8)
Estimated fair value | 211,448 | 220,727
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Gross unrealized losses, less than 12 months |  | (8)
Fair value, less than 12 months |  | 19,992
Mortgage-related securities - FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Amortized cost | 334,607 | 334,183
Gross unrealized gains | 11,211 | 10,699
Gross unrealized losses | (149) | (17)
Estimated fair value | 345,669 | 344,865
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Gross unrealized losses, less than 12 months | (149) | (17)
Fair value, less than 12 months | 21,048 | 11,994
Municipal bonds |  |
Available-for-sale securities |  |
Amortized cost | 78,532 | 55,393
Gross unrealized gains | 3,478 | 3,346
Gross unrealized losses | (15) |
Estimated fair value | 81,995 | 58,739
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Gross unrealized losses, less than 12 months | (15) |
Fair value, less than 12 months | $ 7,357 |

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