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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Loans and Leases Evaluated for Impairment [Abstract]      
Net loans and leases $ 13,248,102,000   $ 12,900,330,000
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
Allowance for loan and lease losses 222,942,000   233,394,000
Originated Loans
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 179,874,000 179,046,000  
Provisions 370,000 4,016,000  
Charge-offs (4,422,000) (8,067,000)  
Recoveries 2,127,000 1,551,000  
Ending balance 177,949,000 176,546,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 9,495,000   10,161,000
ALLL for loans and leases collectively evaluated for impairment 168,454,000   169,713,000
Total allowance for loan and lease losses 177,949,000 176,546,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 123,067,000   132,146,000
Loans and leases collectively evaluated for impairment 12,077,159,000   11,972,152,000
Net loans and leases 12,200,226,000   12,104,298,000
Originated Loans | Commercial | Construction and land development
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 10,335,000 6,031,000  
Provisions 1,885,000 (1,834,000)  
Charge-offs 0 (254,000)  
Recoveries 26,000 368,000  
Ending balance 12,246,000 4,311,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 144,000   103,000
ALLL for loans and leases collectively evaluated for impairment 12,102,000   10,232,000
Total allowance for loan and lease losses 12,246,000 4,311,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 2,329,000   2,272,000
Loans and leases collectively evaluated for impairment 332,942,000   317,575,000
Net loans and leases 335,271,000   319,847,000
Originated Loans | Commercial | Mortgage
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 100,257,000 70,927,000  
Provisions (6,979,000) 2,536,000  
Charge-offs (168,000) (654,000)  
Recoveries 1,107,000 8,000  
Ending balance 94,217,000 72,817,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 6,400,000   6,873,000
ALLL for loans and leases collectively evaluated for impairment 87,817,000   93,384,000
Total allowance for loan and lease losses 94,217,000 72,817,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 88,987,000   97,111,000
Loans and leases collectively evaluated for impairment 6,241,856,000   6,265,379,000
Net loans and leases 6,330,843,000   6,362,490,000
Originated Loans | Commercial | Other commercial real estate
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 1,009,000 2,059,000  
Provisions (74,000) (100,000)  
Charge-offs 0 (54,000)  
Recoveries 10,000 10,000  
Ending balance 945,000 1,915,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 203,000   209,000
ALLL for loans and leases collectively evaluated for impairment 742,000   800,000
Total allowance for loan and lease losses 945,000 1,915,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 1,627,000   1,878,000
Loans and leases collectively evaluated for impairment 175,455,000   176,876,000
Net loans and leases 177,082,000   178,754,000
Originated Loans | Commercial | Commercial and industrial
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 22,362,000 23,352,000  
Provisions 1,976,000 500,000  
Charge-offs (496,000) (1,258,000)  
Recoveries 179,000 369,000  
Ending balance 24,021,000 22,963,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 769,000   771,000
ALLL for loans and leases collectively evaluated for impairment 23,252,000   21,591,000
Total allowance for loan and lease losses 24,021,000 22,963,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 8,804,000   9,300,000
Loans and leases collectively evaluated for impairment 1,166,739,000   1,071,858,000
Net loans and leases 1,175,543,000   1,081,158,000
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
Loans and leases, loan growth 94,400,000    
Originated Loans | Commercial | Lease financing
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 4,749,000 3,521,000  
Provisions (524,000) 22,000  
Charge-offs (58,000) 0  
Recoveries 16,000 0  
Ending balance 4,183,000 3,543,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 13,000   54,000
ALLL for loans and leases collectively evaluated for impairment 4,170,000   4,695,000
Total allowance for loan and lease losses 4,183,000 3,543,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 393,000   188,000
Loans and leases collectively evaluated for impairment 393,875,000   381,575,000
Net loans and leases 394,268,000   381,763,000
Originated Loans | Commercial | Other
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 190,000 1,175,000  
Provisions 272,000 315,000  
Charge-offs (8,000) 0  
Recoveries 0 0  
Ending balance 454,000 1,490,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 0   0
ALLL for loans and leases collectively evaluated for impairment 454,000   190,000
Total allowance for loan and lease losses 454,000 1,490,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 0   0
Loans and leases collectively evaluated for impairment 179,725,000   175,336,000
Net loans and leases 179,725,000   175,336,000
Originated Loans | Noncommerical | Mortgage
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 10,511,000 3,836,000  
Provisions 609,000 733,000  
Charge-offs (184,000) (818,000)  
Recoveries 8,000 39,000  
Ending balance 10,944,000 3,790,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 1,418,000   1,586,000
ALLL for loans and leases collectively evaluated for impairment 9,526,000   8,925,000
Total allowance for loan and lease losses 10,944,000 3,790,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 15,626,000   15,539,000
Loans and leases collectively evaluated for impairment 1,014,406,000   966,882,000
Net loans and leases 1,030,032,000   982,421,000
Originated Loans | Noncommerical | Construction and land development
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 681,000 1,721,000  
Provisions 577,000 (113,000)  
Charge-offs (71,000) (245,000)  
Recoveries 62,000 56,000  
Ending balance 1,249,000 1,419,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 77,000   72,000
ALLL for loans and leases collectively evaluated for impairment 1,172,000   609,000
Total allowance for loan and lease losses 1,249,000 1,419,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 699,000   1,108,000
Loans and leases collectively evaluated for impairment 118,350,000   121,684,000
Net loans and leases 119,049,000   122,792,000
Originated Loans | Noncommerical | Revolving mortgage
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 16,239,000 25,185,000  
Provisions 1,353,000 1,431,000  
Charge-offs (1,260,000) (2,188,000)  
Recoveries 76,000 71,000  
Ending balance 16,408,000 24,499,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 353,000   372,000
ALLL for loans and leases collectively evaluated for impairment 16,055,000   15,867,000
Total allowance for loan and lease losses 16,408,000 24,499,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 3,587,000   3,596,000
Loans and leases collectively evaluated for impairment 2,087,413,000   2,109,689,000
Net loans and leases 2,091,000,000   2,113,285,000
Originated Loans | Noncommerical | Consumer
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 13,541,000 25,389,000  
Provisions 1,275,000 604,000  
Charge-offs (2,177,000) (2,596,000)  
Recoveries 643,000 630,000  
Ending balance 13,282,000 24,027,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
ALLL for loans and leases individually evaluated for impairment 118,000   121,000
ALLL for loans and leases collectively evaluated for impairment 13,164,000   13,420,000
Total allowance for loan and lease losses 13,282,000 24,027,000  
Loans and Leases Evaluated for Impairment [Abstract]      
Loans and leases individually evaluated for impairment 1,015,000   1,154,000
Loans and leases collectively evaluated for impairment 366,398,000   385,298,000
Net loans and leases 367,413,000   386,452,000
Originated Loans | Noncommerical | Non-specific
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 0 15,850,000  
Provisions 0 (78,000)  
Charge-offs 0 0  
Recoveries 0 0  
Ending balance 0 15,772,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 0 15,772,000  
Acquired Loans
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 53,520,000 139,972,000  
Provisions (2,273,000) (22,622,000)  
Charge-offs (6,254,000) (20,877,000)  
Recoveries 0 0  
Ending balance 44,993,000 96,473,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 44,993,000 96,473,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 44,993,000   53,520,000
Loans and leases acquired with deteriorated credit quality 1,270,818,000   1,029,426,000
Acquired Loans | Commercial | Construction and land development
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 1,320,000 31,186,000  
Provisions 3,355,000 (13,147,000)  
Charge-offs (199,000) (4,733,000)  
Recoveries 0 0  
Ending balance 4,476,000 13,306,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 4,476,000 13,306,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 4,476,000   1,320,000
Loans and leases acquired with deteriorated credit quality 106,670,000   78,915,000
Acquired Loans | Commercial | Mortgage
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 29,906,000 50,275,000  
Provisions (3,386,000) (2,084,000)  
Charge-offs (3,517,000) (9,898,000)  
Recoveries 0 0  
Ending balance 23,003,000 38,293,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 23,003,000 38,293,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 23,003,000   29,906,000
Loans and leases acquired with deteriorated credit quality 728,872,000   642,891,000
Acquired Loans | Commercial | Other commercial real estate
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 1,354,000 11,234,000  
Provisions (150,000) (5,131,000)  
Charge-offs 0 (931,000)  
Recoveries 0 0  
Ending balance 1,204,000 5,172,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 1,204,000 5,172,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 1,204,000   1,354,000
Loans and leases acquired with deteriorated credit quality 47,826,000   41,381,000
Acquired Loans | Commercial | Commercial and industrial
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 5,275,000 8,897,000  
Provisions (336,000) 4,233,000  
Charge-offs (2,683,000) (1,254,000)  
Recoveries 0 0  
Ending balance 2,256,000 11,876,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 2,256,000 11,876,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 2,256,000   5,275,000
Loans and leases acquired with deteriorated credit quality 38,838,000   17,254,000
Acquired Loans | Noncommerical | Mortgage
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 11,802,000 19,837,000  
Provisions (2,300,000) (1,505,000)  
Charge-offs 262,000 (729,000)  
Recoveries 0 0  
Ending balance 9,764,000 17,603,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 9,764,000 17,603,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 9,764,000   11,802,000
Loans and leases acquired with deteriorated credit quality 291,254,000   213,851,000
Acquired Loans | Noncommerical | Construction and land development
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 682,000 8,287,000  
Provisions (99,000) (2,313,000)  
Charge-offs 0 (3,218,000)  
Recoveries 0 0  
Ending balance 583,000 2,756,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 583,000 2,756,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 583,000   682,000
Loans and leases acquired with deteriorated credit quality 28,151,000   2,583,000
Acquired Loans | Noncommerical | Revolving mortgage
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 2,959,000 9,754,000  
Provisions 634,000 (2,505,000)  
Charge-offs (100,000) (114,000)  
Recoveries 0 0  
Ending balance 3,493,000 7,135,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 3,493,000 7,135,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 3,493,000   2,959,000
Loans and leases acquired with deteriorated credit quality 25,776,000   30,834,000
Acquired Loans | Noncommerical | Consumer and Other
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 222,000 502,000  
Provisions 9,000 (170,000)  
Charge-offs (17,000) 0  
Recoveries 0 0  
Ending balance 214,000 332,000  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]      
Total allowance for loan and lease losses 214,000 332,000  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]      
ALLL for loans and leases acquired with deteriorated credit quality 214,000   222,000
Loans and leases acquired with deteriorated credit quality $ 3,431,000   $ 1,717,000