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Bank subsidiary (Details 5) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Available-for-sale securities |  |
Amortized cost | $ 558,699 | $ 653,492
Gross unrealized gains | 8,747 | 18,070
Gross unrealized losses | (7,274) | (204)
Estimated fair value | 560,172 | 671,358
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 235,088 | 32,269
Gross unrealized losses, less than 12 months | (7,274) | (204)
Federal agency obligations |  |
Available-for-sale securities |  |
Amortized cost | 99,963 | 168,324
Gross unrealized gains | 561 | 3,167
Gross unrealized losses | (1,460) |
Estimated fair value | 99,064 | 171,491
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 30,383 |
Gross unrealized losses, less than 12 months | (1,460) |
Mortgage-related securities - FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Amortized cost | 381,281 | 407,175
Gross unrealized gains | 6,257 | 10,412
Gross unrealized losses | (5,494) | (204)
Estimated fair value | 382,044 | 417,383
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 178,144 | 32,269
Gross unrealized losses, less than 12 months | (5,494) | (204)
Municipal bonds |  |
Available-for-sale securities |  |
Amortized cost | 77,455 | 77,993
Gross unrealized gains | 1,929 | 4,491
Gross unrealized losses | (320) |
Estimated fair value | 79,064 | 82,484
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 26,561 |
Gross unrealized losses, less than 12 months | $ (320) |

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