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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Noncovered loans and leases $ 11,462,458 [1] $ 11,581,637 [2] $ 11,528,854 [1]
Covered under loss share agreements 1,999,351 [1] 2,362,152 [2] 2,399,738 [1]
Commercial Mortgage
      
Noncovered loans and leases 7,825,628 7,866,572 7,697,242
Covered under loss share agreements 1,598,579 1,872,685 1,947,422
Non-Commercial Loans
      
Noncovered loans and leases 3,636,830 3,715,065 3,831,612
Covered under loss share agreements 400,772 489,467 452,316
Construction and Land Development | Commercial Mortgage
      
Noncovered loans and leases 329,151 381,163 407,134
Covered under loss share agreements 272,445 338,873 338,650
Construction and Land Development | Non-Commercial Loans
      
Noncovered loans and leases 127,726 137,271 145,445
Covered under loss share agreements 39,294 105,536 82,177
Commercial Mortgage | Commercial Mortgage
      
Noncovered loans and leases 1,722,761 1,764,407 1,805,812
Commercial Mortgage | Commercial Mortgage
      
Noncovered loans and leases 5,149,696 5,104,993 4,861,457
Covered under loss share agreements 1,142,677 1,260,589 1,307,775
Other Commercial Real Estate | Commercial Mortgage
      
Noncovered loans and leases 162,579 144,771 148,977
Covered under loss share agreements 115,787 158,394 173,606
Commercial and Industrial | Commercial Mortgage
      
Noncovered loans and leases 1,722,761 1,764,407 1,805,812
Covered under loss share agreements 66,442 113,442 125,492
Lease Financing | Commercial Mortgage
      
Noncovered loans and leases 320,703 312,869 303,104
Covered under loss share agreements 0 57 224
Other | Commercial Mortgage
      
Noncovered loans and leases 140,738 158,369 170,758
Covered under loss share agreements 1,228 1,330 1,675
Residential Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 809,230 784,118 825,610
Covered under loss share agreements 322,053 327,568 354,033
Revolving Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 2,268,210 2,296,306 2,303,687
Covered under loss share agreements 37,110 51,552 11,933
Consumer | Non-Commercial Loans
      
Noncovered loans and leases 431,664 497,370 556,870
Covered under loss share agreements 2,315 4,811 4,173
Pass | Commercial Mortgage
      
Noncovered loans and leases 7,215,759 7,232,547 7,057,419
Pass | Construction and Land Development | Commercial Mortgage
      
Noncovered loans and leases 289,974 332,742 362,202
Pass | Commercial Mortgage | Commercial Mortgage
      
Noncovered loans and leases 4,775,558 4,749,254 4,505,768
Pass | Other Commercial Real Estate | Commercial Mortgage
      
Noncovered loans and leases 149,977 130,586 134,686
Pass | Commercial and Industrial | Commercial Mortgage
      
Noncovered loans and leases 1,545,409 1,556,651 1,590,496
Pass | Lease Financing | Commercial Mortgage
      
Noncovered loans and leases 315,119 306,225 294,134
Pass | Other | Commercial Mortgage
      
Noncovered loans and leases 139,722 157,089 170,133
Special Mention | Commercial Mortgage
      
Noncovered loans and leases 264,087 287,788 294,526
Special Mention | Construction and Land Development | Commercial Mortgage
      
Noncovered loans and leases 10,353 18,973 11,923
Special Mention | Commercial Mortgage | Commercial Mortgage
      
Noncovered loans and leases 221,194 220,235 229,564
Special Mention | Other Commercial Real Estate | Commercial Mortgage
      
Noncovered loans and leases 6,220 5,821 8,352
Special Mention | Commercial and Industrial | Commercial Mortgage
      
Noncovered loans and leases 23,323 36,951 38,466
Special Mention | Lease Financing | Commercial Mortgage
      
Noncovered loans and leases 2,740 4,537 5,619
Special Mention | Other | Commercial Mortgage
      
Noncovered loans and leases 257 1,271 602
Substandard | Commercial Mortgage
      
Noncovered loans and leases 197,611 196,325 185,164
Substandard | Construction and Land Development | Commercial Mortgage
      
Noncovered loans and leases 27,266 28,793 32,494
Substandard | Commercial Mortgage | Commercial Mortgage
      
Noncovered loans and leases 136,390 129,391 116,267
Substandard | Other Commercial Real Estate | Commercial Mortgage
      
Noncovered loans and leases 5,821 7,794 5,398
Substandard | Commercial and Industrial | Commercial Mortgage
      
Noncovered loans and leases 25,525 28,240 27,881
Substandard | Lease Financing | Commercial Mortgage
      
Noncovered loans and leases 1,867 2,107 3,124
Substandard | Other | Commercial Mortgage
      
Noncovered loans and leases 742 0 0
Doubtful | Commercial Mortgage
      
Noncovered loans and leases 17,131 2,201 8,337
Doubtful | Construction and Land Development | Commercial Mortgage
      
Noncovered loans and leases 1,232 17 515
Doubtful | Commercial Mortgage | Commercial Mortgage
      
Noncovered loans and leases 12,202 1,164 6,435
Doubtful | Other Commercial Real Estate | Commercial Mortgage
      
Noncovered loans and leases 265 377 401
Doubtful | Commercial and Industrial | Commercial Mortgage
      
Noncovered loans and leases 2,915 643 804
Doubtful | Lease Financing | Commercial Mortgage
      
Noncovered loans and leases 517 0 182
Doubtful | Other | Commercial Mortgage
      
Noncovered loans and leases 0 0 0
Ungraded | Commercial Mortgage
      
Noncovered loans and leases 131,040 147,711 151,796
Ungraded | Construction and Land Development | Commercial Mortgage
      
Noncovered loans and leases 326 638 0
Ungraded | Commercial Mortgage | Commercial Mortgage
      
Noncovered loans and leases 4,352 4,949 3,423
Ungraded | Other Commercial Real Estate | Commercial Mortgage
      
Noncovered loans and leases 296 193 140
Ungraded | Commercial and Industrial | Commercial Mortgage
      
Noncovered loans and leases 125,589 141,922 148,165
Ungraded | Lease Financing | Commercial Mortgage
      
Noncovered loans and leases 460 0 45
Ungraded | Other | Commercial Mortgage
      
Noncovered loans and leases 17 9 23
Covered Loans
      
Covered under loss share agreements 1,999,351 2,362,152 2,399,738
Covered Loans | Construction and Land Development | Commercial Mortgage
      
Covered under loss share agreements 272,445 338,873 338,650
Covered Loans | Construction and Land Development | Non-Commercial Loans
      
Covered under loss share agreements 39,294 105,536 82,177
Covered Loans | Commercial Mortgage
      
Covered under loss share agreements 1,142,677 1,260,589 1,307,775
Covered Loans | Other Commercial Real Estate
      
Covered under loss share agreements 115,787 158,394 173,606
Covered Loans | Commercial and Industrial
      
Covered under loss share agreements 66,442 113,442 125,492
Covered Loans | Lease Financing
      
Covered under loss share agreements 0 57 224
Covered Loans | Residential Mortgage
      
Covered under loss share agreements 322,053 327,568 354,033
Covered Loans | Revolving Mortgage
      
Covered under loss share agreements 37,110 51,552 11,933
Covered Loans | Consumer and Other
      
Covered under loss share agreements 3,543 6,141 5,848
Covered Loans | Pass
      
Covered under loss share agreements 658,299 743,881 1,018,946
Covered Loans | Pass | Construction and Land Development | Commercial Mortgage
      
Covered under loss share agreements 20,662 29,321 57,074
Covered Loans | Pass | Construction and Land Development | Non-Commercial Loans
      
Covered under loss share agreements 137 4,958 5,883
Covered Loans | Pass | Commercial Mortgage
      
Covered under loss share agreements 358,287 397,526 561,871
Covered Loans | Pass | Other Commercial Real Estate
      
Covered under loss share agreements 36,459 49,259 60,738
Covered Loans | Pass | Commercial and Industrial
      
Covered under loss share agreements 25,280 36,409 51,519
Covered Loans | Pass | Lease Financing
      
Covered under loss share agreements 0 57 218
Covered Loans | Pass | Residential Mortgage
      
Covered under loss share agreements 187,317 189,794 266,349
Covered Loans | Pass | Revolving Mortgage
      
Covered under loss share agreements 28,528 34,164 11,307
Covered Loans | Pass | Consumer and Other
      
Covered under loss share agreements 1,629 2,393 3,987
Covered Loans | Special Mention
      
Covered under loss share agreements 472,953 550,617 539,543
Covered Loans | Special Mention | Construction and Land Development | Commercial Mortgage
      
Covered under loss share agreements 79,987 92,758 99,051
Covered Loans | Special Mention | Construction and Land Development | Non-Commercial Loans
      
Covered under loss share agreements 2,428 13,394 21,654
Covered Loans | Special Mention | Commercial Mortgage
      
Covered under loss share agreements 331,659 348,482 304,731
Covered Loans | Special Mention | Other Commercial Real Estate
      
Covered under loss share agreements 23,293 33,754 41,616
Covered Loans | Special Mention | Commercial and Industrial
      
Covered under loss share agreements 16,969 32,257 46,944
Covered Loans | Special Mention | Lease Financing
      
Covered under loss share agreements 0 0 0
Covered Loans | Special Mention | Residential Mortgage
      
Covered under loss share agreements 16,602 25,464 25,153
Covered Loans | Special Mention | Revolving Mortgage
      
Covered under loss share agreements 1,748 3,566 143
Covered Loans | Special Mention | Consumer and Other
      
Covered under loss share agreements 267 942 251
Covered Loans | Substandard
      
Covered under loss share agreements 624,774 787,309 624,884
Covered Loans | Substandard | Construction and Land Development | Commercial Mortgage
      
Covered under loss share agreements 73,179 125,158 91,247
Covered Loans | Substandard | Construction and Land Development | Non-Commercial Loans
      
Covered under loss share agreements 30,190 72,349 42,395
Covered Loans | Substandard | Commercial Mortgage
      
Covered under loss share agreements 372,528 427,996 377,263
Covered Loans | Substandard | Other Commercial Real Estate
      
Covered under loss share agreements 46,465 58,351 47,081
Covered Loans | Substandard | Commercial and Industrial
      
Covered under loss share agreements 15,630 21,914 20,832
Covered Loans | Substandard | Lease Financing
      
Covered under loss share agreements 0 0 0
Covered Loans | Substandard | Residential Mortgage
      
Covered under loss share agreements 79,239 70,582 45,439
Covered Loans | Substandard | Revolving Mortgage
      
Covered under loss share agreements 6,834 9,863 483
Covered Loans | Substandard | Consumer and Other
      
Covered under loss share agreements 709 1,096 144
Covered Loans | Doubtful
      
Covered under loss share agreements 213,846 246,308 205,675
Covered Loans | Doubtful | Construction and Land Development | Commercial Mortgage
      
Covered under loss share agreements 95,354 87,936 89,761
Covered Loans | Doubtful | Construction and Land Development | Non-Commercial Loans
      
Covered under loss share agreements 6,539 14,835 12,245
Covered Loans | Doubtful | Commercial Mortgage
      
Covered under loss share agreements 77,679 84,871 63,775
Covered Loans | Doubtful | Other Commercial Real Estate
      
Covered under loss share agreements 9,570 17,030 24,171
Covered Loans | Doubtful | Commercial and Industrial
      
Covered under loss share agreements 8,449 22,862 6,197
Covered Loans | Doubtful | Lease Financing
      
Covered under loss share agreements 0 0 6
Covered Loans | Doubtful | Residential Mortgage
      
Covered under loss share agreements 15,702 13,833 8,648
Covered Loans | Doubtful | Revolving Mortgage
      
Covered under loss share agreements 0 3,959 0
Covered Loans | Doubtful | Consumer and Other
      
Covered under loss share agreements 553 982 872
Covered Loans | Ungraded
      
Covered under loss share agreements 29,479 34,037 10,690
Covered Loans | Ungraded | Construction and Land Development | Commercial Mortgage
      
Covered under loss share agreements 3,263 3,700 1,517
Covered Loans | Ungraded | Construction and Land Development | Non-Commercial Loans
      
Covered under loss share agreements 0 0 0
Covered Loans | Ungraded | Commercial Mortgage
      
Covered under loss share agreements 2,524 1,714 135
Covered Loans | Ungraded | Other Commercial Real Estate
      
Covered under loss share agreements 0 0 0
Covered Loans | Ungraded | Commercial and Industrial
      
Covered under loss share agreements 114 0 0
Covered Loans | Ungraded | Lease Financing
      
Covered under loss share agreements 0 0 0
Covered Loans | Ungraded | Residential Mortgage
      
Covered under loss share agreements 23,193 27,895 8,444
Covered Loans | Ungraded | Revolving Mortgage
      
Covered under loss share agreements 0 0 0
Covered Loans | Ungraded | Consumer and Other
      
Covered under loss share agreements 385 728 594
Noncovered Loans
      
Noncovered loans and leases 11,462,458 11,581,637 11,528,854
Noncovered Loans | Non-Commercial Loans
      
Noncovered loans and leases 3,636,830 3,715,065 3,831,612
Noncovered Loans | Construction and Land Development | Commercial Mortgage
      
Noncovered loans and leases 329,151 381,163 407,134
Noncovered Loans | Construction and Land Development | Non-Commercial Loans
      
Noncovered loans and leases 127,726 137,271 145,445
Noncovered Loans | Commercial Mortgage
      
Noncovered loans and leases 5,149,696 5,104,993 4,861,457
Noncovered Loans | Other Commercial Real Estate
      
Noncovered loans and leases 162,579 144,771 148,977
Noncovered Loans | Commercial and Industrial
      
Noncovered loans and leases 1,722,761 1,764,407 1,805,812
Noncovered Loans | Lease Financing
      
Noncovered loans and leases 320,703 312,869 303,104
Noncovered Loans | Other
      
Noncovered loans and leases 140,738 158,369 170,758
Noncovered Loans | Residential Mortgage
      
Noncovered loans and leases 809,230 784,118 825,610
Noncovered Loans | Residential Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 809,230 784,118 825,610
Noncovered Loans | Revolving Mortgage
      
Noncovered loans and leases 2,268,210 2,296,306 2,303,687
Noncovered Loans | Revolving Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 2,268,210 2,296,306 2,303,687
Noncovered Loans | Consumer
      
Noncovered loans and leases 431,664 497,370 556,870
Noncovered Loans | Consumer | Non-Commercial Loans
      
Noncovered loans and leases 431,664 497,370 556,870
Noncovered Loans | Current | Non-Commercial Loans
      
Noncovered loans and leases 3,585,379 3,670,540 3,792,574
Noncovered Loans | Current | Construction and Land Development | Non-Commercial Loans
      
Noncovered loans and leases 125,096 135,774 143,376
Noncovered Loans | Current | Residential Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 781,632 757,113 806,439
Noncovered Loans | Current | Revolving Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 2,251,428 2,286,511 2,291,153
Noncovered Loans | Current | Consumer | Non-Commercial Loans
      
Noncovered loans and leases 427,223 491,142 551,606
Noncovered Loans | 30 to 59 Days Past Due | Non-Commercial Loans
      
Noncovered loans and leases 26,077 19,539 9,890
Noncovered Loans | 30 to 59 Days Past Due | Construction and Land Development | Non-Commercial Loans
      
Noncovered loans and leases 1,352 798 381
Noncovered Loans | 30 to 59 Days Past Due | Residential Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 12,601 11,790 3,376
Noncovered Loans | 30 to 59 Days Past Due | Revolving Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 10,131 3,437 3,500
Noncovered Loans | 30 to 59 Days Past Due | Consumer | Non-Commercial Loans
      
Noncovered loans and leases 1,993 3,514 2,633
Noncovered Loans | 60 to 89 Days Past Due | Non-Commercial Loans
      
Noncovered loans and leases 7,541 6,126 6,877
Noncovered Loans | 60 to 89 Days Past Due | Construction and Land Development | Non-Commercial Loans
      
Noncovered loans and leases 447 127 1,120
Noncovered Loans | 60 to 89 Days Past Due | Residential Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 3,659 2,686 2,897
Noncovered Loans | 60 to 89 Days Past Due | Revolving Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 2,460 2,042 1,732
Noncovered Loans | 60 to 89 Days Past Due | Consumer | Non-Commercial Loans
      
Noncovered loans and leases 975 1,271 1,128
Noncovered Loans | 90 Days or Greater Past Due | Non-Commercial Loans
      
Noncovered loans and leases 17,833 18,860 22,271
Noncovered Loans | 90 Days or Greater Past Due | Construction and Land Development | Non-Commercial Loans
      
Noncovered loans and leases 831 572 568
Noncovered Loans | 90 Days or Greater Past Due | Residential Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 11,338 12,529 12,898
Noncovered Loans | 90 Days or Greater Past Due | Revolving Mortgage | Non-Commercial Loans
      
Noncovered loans and leases 4,191 4,316 7,302
Noncovered Loans | 90 Days or Greater Past Due | Consumer | Non-Commercial Loans
      
Noncovered loans and leases $ 1,473 $ 1,443 $ 1,503
[1] Unaudited
[2] Derived from 2011 Annual Report on Form 10-K.