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Basis of presentation (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Consolidated Balance Sheet |  |  |  |
Other assets | $ 573,523 | $ 519,296 |  |
Total assets | 9,904,827 | 9,594,477 |  |
Other liabilities | 507,626 | 521,979 |  |
Total liabilities | 8,263,399 | 8,031,478 |  |
Retained earnings | 233,218 | 198,397 |  | 178,667
Total shareholders' equity | 1,607,135 | 1,528,706 | 1,534,515 | 1,480,394
Total liabilities and shareholders' equity | 9,904,827 | 9,594,477 |  |
Consolidated Statement of Changes in Shareholders' Equity |  |  |  |
Retained earnings | 233,218 | 198,397 |  | 178,667
Total shareholders' equity | 1,607,135 | 1,528,706 | 1,534,515 | 1,480,394
As previously filed |  |  |  |
Consolidated Balance Sheet |  |  |  |
Other assets |  | 517,550 |  |
Total assets |  | 9,592,731 |  |
Other liabilities |  | 516,990 |  |
Total liabilities |  | 8,026,489 |  |
Retained earnings |  | 201,640 |  | 181,910
Total shareholders' equity |  | 1,531,949 |  | 1,483,637
Total liabilities and shareholders' equity |  | 9,592,731 |  |
Consolidated Statement of Changes in Shareholders' Equity |  |  |  |
Retained earnings |  | 201,640 |  | 181,910
Total shareholders' equity |  | 1,531,949 |  | 1,483,637
Difference |  |  |  |
Consolidated Balance Sheet |  |  |  |
Other assets |  | 1,746 |  |
Total assets |  | 1,746 |  |
Other liabilities |  | 4,989 |  |
Total liabilities |  | 4,989 |  |
Retained earnings |  | (3,243) |  | (3,243)
Total shareholders' equity |  | (3,243) |  | (3,243)
Total liabilities and shareholders' equity |  | 1,746 |  |
Consolidated Statement of Changes in Shareholders' Equity |  |  |  |
Retained earnings |  | (3,243) |  | (3,243)
Total shareholders' equity |  | $ (3,243) |  | $ (3,243)

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