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Bank subsidiary (Details 3) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Available-for-sale securities |  |
Amortized cost | $ 699,713 | $ 672,288
Gross unrealized gains | 12,297 | 9,748
Gross unrealized losses | (663) | (3,884)
Estimated fair value | 711,347 | 678,152
Federal agency obligations |  |
Available-for-sale securities |  |
Amortized cost | 292,346 | 317,945
Gross unrealized gains | 1,049 | 171
Gross unrealized losses | (439) | (2,220)
Estimated fair value | 292,956 | 315,896
Mortgage-related securities - FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Amortized cost | 365,908 | 310,711
Gross unrealized gains | 10,680 | 9,570
Gross unrealized losses | (209) | (311)
Estimated fair value | 376,379 | 319,970
Municipal bonds |  |
Available-for-sale securities |  |
Amortized cost | 41,459 | 43,632
Gross unrealized gains | 568 | 7
Gross unrealized losses | (15) | (1,353)
Estimated fair value | $ 42,012 | $ 42,286

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