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Bank subsidiary (Details 5) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Available-for-sale securities |  |
Amortized cost | $ 536,430 | $ 653,492
Gross unrealized gains | 8,731 | 18,070
Gross unrealized losses | (9,897) | (204)
Total available for sale securities | 535,264 | 671,358
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 221,279 | 32,269
Gross unrealized losses, less than 12 months | (9,749) | (204)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,910 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | (148) | 0
Federal agency obligations |  |
Available-for-sale securities |  |
Amortized cost | 99,812 | 168,324
Gross unrealized gains | 389 | 3,167
Gross unrealized losses | (1,936) | 0
Total available for sale securities | 98,265 | 171,491
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 29,755 | 0
Gross unrealized losses, less than 12 months | (1,936) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 |
Mortgage-related securities - FNMA, FHLMC and GNMA |  |
Available-for-sale securities |  |
Amortized cost | 359,437 | 407,175
Gross unrealized gains | 6,308 | 10,412
Gross unrealized losses | (7,768) | (204)
Total available for sale securities | 357,977 | 417,383
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 164,998 | 32,269
Gross unrealized losses, less than 12 months | (7,620) | (204)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,910 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | (148) |
Municipal bonds |  |
Available-for-sale securities |  |
Amortized cost | 77,181 | 77,993
Gross unrealized gains | 2,034 | 4,491
Gross unrealized losses | (193) | 0
Total available for sale securities | 79,022 | 82,484
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Fair value, less than 12 months | 26,526 | 0
Gross unrealized losses, less than 12 months | (193) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | $ 0 |

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