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Loans (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable $ 7,764,059 $ 7,635,776 $ 6,989,973
Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 99,150 113,168 196,251
Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 1,207,014 [1] 1,291,476 [2] 1,604,274 [3]
Commercial Real Estate Other Receivable [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 1,984,573 1,992,193 2,001,423
Commercial Real Estate Other Receivable [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 59,038 62,743 114,193
Commercial Real Estate Other Receivable [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 726,103 [1] 777,848 [2] 976,617 [3]
Commercial Real Estate Other Receivable [Member] | Grade Two [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 6,210 4,218 3,377
Commercial Real Estate Other Receivable [Member] | Grade Two [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Other Receivable [Member] | Grade Two [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Other Receivable [Member] | Grade Three [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 243,461 249,382 248,224
Commercial Real Estate Other Receivable [Member] | Grade Three [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 1,871 3,696
Commercial Real Estate Other Receivable [Member] | Grade Three [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 495 516 5,584
Commercial Real Estate Other Receivable [Member] | Grade Four [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 1,554,118 1,548,420 1,504,267
Commercial Real Estate Other Receivable [Member] | Grade Four [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 56,341 55,129 108,500
Commercial Real Estate Other Receivable [Member] | Grade Four [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 272,278 303,231 408,683
Commercial Real Estate Other Receivable [Member] | Grade Five [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 70,452 58,942 96,440
Commercial Real Estate Other Receivable [Member] | Grade Five [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Other Receivable [Member] | Grade Five [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 90,901 103,919 209,800
Commercial Real Estate Other Receivable [Member] | Grade Six [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 110,332 130,968 137,740
Commercial Real Estate Other Receivable [Member] | Grade Six [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 2,697 5,743 1,997
Commercial Real Estate Other Receivable [Member] | Grade Six [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 349,702 344,445 308,729
Commercial Real Estate Other Receivable [Member] | Grade Seven [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 263 313
Commercial Real Estate Other Receivable [Member] | Grade Seven [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Other Receivable [Member] | Grade Seven [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 12,727 25,737 43,821
Commercial Real Estate Other Receivable [Member] | Grade One [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 11,062
Commercial Real Estate Other Receivable [Member] | Grade One [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Other Receivable [Member] | Grade One [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 285,715 277,335 259,018
Commercial Real Estate Construction Financing Receivable [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 83,219 89,909 110,047
Commercial Real Estate Construction Financing Receivable [Member] | Grade Two [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 610 615 2,843
Commercial Real Estate Construction Financing Receivable [Member] | Grade Two [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Two [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Three [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 18,208 16,752 40,705
Commercial Real Estate Construction Financing Receivable [Member] | Grade Three [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Three [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Four [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 251,354 241,302 182,071
Commercial Real Estate Construction Financing Receivable [Member] | Grade Four [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Four [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 487 487 4,521
Commercial Real Estate Construction Financing Receivable [Member] | Grade Five [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 4,257 4,583 7,261
Commercial Real Estate Construction Financing Receivable [Member] | Grade Five [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Five [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 1,613 1,567 3,408
Commercial Real Estate Construction Financing Receivable [Member] | Grade Six [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 11,286 14,083 24,785
Commercial Real Estate Construction Financing Receivable [Member] | Grade Six [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Six [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 72,675 80,009 64,968
Commercial Real Estate Construction Financing Receivable [Member] | Grade Seven [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Seven [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade Seven [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 8,444 7,846 37,150
Commercial Real Estate Construction Financing Receivable [Member] | Grade One [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 1,353
Commercial Real Estate Construction Financing Receivable [Member] | Grade One [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Real Estate Construction Financing Receivable [Member] | Grade One [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 74,112 73,530 60,487
Commercial Leases Financing Receivable [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Two [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Two [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Two [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Three [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 7,098 5,868 4,097
Commercial Leases Financing Receivable [Member] | Grade Three [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Three [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Four [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 55,930 57,026 48,322
Commercial Leases Financing Receivable [Member] | Grade Four [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Four [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Five [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 187
Commercial Leases Financing Receivable [Member] | Grade Five [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Five [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Six [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 378 0 149
Commercial Leases Financing Receivable [Member] | Grade Six [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Six [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Seven [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Seven [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade Seven [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade One [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 10,706 10,636 7,732
Commercial Leases Financing Receivable [Member] | Grade One [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial Leases Financing Receivable [Member] | Grade One [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial and Industrial Financing Receivable [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 2,873,172 2,748,702 2,135,283
Commercial and Industrial Financing Receivable [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 17,553 26,774 55,459
Commercial and Industrial Financing Receivable [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 181,966 [1] 197,539 [2] 258,127 [3]
Commercial and Industrial Financing Receivable [Member] | Grade Two [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 97,078 122,124 91,210
Commercial and Industrial Financing Receivable [Member] | Grade Two [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial and Industrial Financing Receivable [Member] | Grade Two [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 1,384 1,376 0
Commercial and Industrial Financing Receivable [Member] | Grade Three [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 521,791 479,119 322,185
Commercial and Industrial Financing Receivable [Member] | Grade Three [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 150
Commercial and Industrial Financing Receivable [Member] | Grade Three [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 523 0 3,964
Commercial and Industrial Financing Receivable [Member] | Grade Four [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 2,070,512 1,973,671 1,572,599
Commercial and Industrial Financing Receivable [Member] | Grade Four [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 17,307 26,036 54,164
Commercial and Industrial Financing Receivable [Member] | Grade Four [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 98,347 109,360 107,152
Commercial and Industrial Financing Receivable [Member] | Grade Five [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 51,591 50,789 55,624
Commercial and Industrial Financing Receivable [Member] | Grade Five [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial and Industrial Financing Receivable [Member] | Grade Five [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 7,913 9,661 57,338
Commercial and Industrial Financing Receivable [Member] | Grade Six [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 91,527 85,392  
Commercial and Industrial Financing Receivable [Member] | Grade Six [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 246 738 392
Commercial and Industrial Financing Receivable [Member] | Grade Six [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 67,000 69,330 76,113
Commercial and Industrial Financing Receivable [Member] | Grade Seven [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 68 0 148
Commercial and Industrial Financing Receivable [Member] | Grade Seven [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 0
Commercial and Industrial Financing Receivable [Member] | Grade Seven [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 5,873 6,864 12,766
Commercial and Industrial Financing Receivable [Member] | Grade One [Member] | Legacy Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 40,605 37,607 45,658
Commercial and Industrial Financing Receivable [Member] | Grade One [Member] | Acquired Loans Noncovered [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable 0 0 753
Commercial and Industrial Financing Receivable [Member] | Grade One [Member] | Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable $ 926 $ 948 $ 794
[1] Excludes loss share receivable of $171.1 million as of March 31, 2012.
[2] Excludes loss share receivable of $205.7 million as of December 31, 2011.
[3] Excludes loss share receivable of $266.0 million as of March 31, 2011