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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 29, 2011
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | $ 40,869 | $ 38,006 | $ 81,686 | $ 75,295 |  |
Noninterest income | 20,364 | 19,679 | 43,801 | 37,409 |  |
Income before taxes | 18,422 | 16,062 | 40,466 | 33,896 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 5,671,711 | 5,267,445 | 5,671,711 | 5,267,445 | 5,608,825 | 10,000,000
Metropolitan Banks [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | 13,354 | 12,311 | 26,517 | 24,483 |  |
Noninterest income | 2,672 | 2,706 | 5,353 | 5,512 |  |
Income before taxes | 8,220 | 6,398 | 16,652 | 14,880 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 1,801,752 | 1,656,064 | 1,801,752 | 1,656,064 | 1,738,426 |
Community Banks [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | 26,384 | 24,921 | 53,015 | 49,058 |  |
Noninterest income | 10,721 | 9,647 | 20,856 | 18,685 |  |
Income before taxes | 14,944 | 13,616 | 30,199 | 26,836 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 3,688,931 | 3,401,037 | 3,688,931 | 3,401,037 | 3,660,239 |
Other Financial Services [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | 1,721 | 1,759 | 3,434 | 3,751 |  |
Noninterest income | 6,214 | 6,427 | 16,078 | 11,581 |  |
Income before taxes | 2,011 | 3,132 | 8,398 | 5,632 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 130,762 | 151,220 | 130,762 | 151,220 | 153,872 |
Executive, Operations and Support [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Net interest income (expense) | (590) | (985) | (1,280) | (1,997) |  |
Noninterest income | 13,245 | 11,616 | 28,626 | 24,264 |  |
Income before taxes | 5,686 | 3,603 | 12,219 | 9,090 |  |
Maximum limit to include the preferred securities in Tier 1 Capital | 607,662 | 605,726 | 607,662 | 605,726 | 602,577 |
Eliminations [Member] |  |  |  |  |  |
Results of operations and selected financial information |  |  |  |  |  |
Noninterest income | (12,488) | (10,717) | (27,112) | (22,633) |  |
Income before taxes | (12,439) | (10,687) | (27,002) | (22,542) |  |
Maximum limit to include the preferred securities in Tier 1 Capital | $ (557,396) | $ (546,602) | $ (557,396) | $ (546,602) | $ (546,289) |

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