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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Jun. 29, 2011
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | $ 40,832 | $ 40,218 | $ 122,518 | $ 115,513 |  |
Noninterest income | 22,116 | 20,117 | 65,917 | 57,526 |  |
Income before taxes | 20,250 | 18,191 | 60,716 | 52,087 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 5,836,751 | 5,472,306 | 5,836,751 | 5,472,306 | 5,608,825 | 10,000,000
Metropolitan Banks [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | 13,267 | 13,167 | 39,784 | 37,650 |  |
Noninterest income | 2,840 | 2,979 | 8,193 | 8,491 |  |
Income before taxes | 8,302 | 7,612 | 24,954 | 22,492 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 1,892,444 | 1,660,756 | 1,892,444 | 1,660,756 | 1,738,426 |
Community Banks [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | 26,302 | 26,518 | 79,317 | 75,576 |  |
Noninterest income | 11,153 | 10,607 | 32,009 | 29,292 |  |
Income before taxes | 15,234 | 14,867 | 45,433 | 41,703 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 3,745,727 | 3,615,387 | 3,745,727 | 3,615,387 | 3,660,239 |
Other Financial Services [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | 1,777 | 1,620 | 5,211 | 5,349 |  |
Noninterest income | 7,404 | 5,845 | 23,482 | 17,448 |  |
Income before taxes | 3,266 | 2,217 | 11,664 | 7,849 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 126,704 | 134,984 | 126,704 | 134,984 | 153,872 |
Executive, Operations and Support [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | (514) | (1,087) | (1,794) | (3,062) |  |
Noninterest income | 14,881 | 13,897 | 43,507 | 38,139 |  |
Income before taxes | 7,463 | 6,557 | 19,682 | 15,647 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 636,853 | 612,535 | 636,853 | 612,535 | 602,577 |
Eliminations [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Noninterest income | (14,162) | (13,211) | (41,274) | (35,844) |  |
Income before taxes | (14,015) | (13,062) | (41,017) | (35,604) |  |
Maximum limit to include the preferred securities in Tier 1 Capital | $ (564,977) | $ (551,356) | $ (564,977) | $ (551,356) | $ (546,289) |

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