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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Loans and Leases Evaluated for Impairment [Abstract]          
Net loans and leases $ 13,318,710   $ 13,318,710   $ 12,900,330
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
Allowance for loan and lease losses 206,246   206,246   233,394
Noncommerical | Non-specific
          
Allowance for Loan and Lease Losses [Roll Forward]          
Reclassification       (15,772)  
Originated Loans
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 177,949 176,546 179,874 179,046  
Provisions 2,230 2,231 2,600 6,247  
Charge-offs (4,771) (6,494) (9,193) (14,561)  
Recoveries 1,507 2,131 3,634 3,682  
Reclassification   7,368   7,368  
Ending balance 176,915 181,782 176,915 181,782  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 13,251   13,251   10,161
ALLL for loans and leases collectively evaluated for impairment 163,664   163,664   169,713
Total allowance for loan and lease losses 176,915 181,782 176,915 181,782  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 124,887   124,887   132,146
Loans and leases collectively evaluated for impairment 12,290,136   12,290,136   11,972,152
Net loans and leases 12,415,023   12,415,023   12,104,298
Originated Loans | Commercial | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 12,246 4,311 10,335 6,031  
Provisions (1,135) 3,296 750 1,462  
Charge-offs 0 (1,286) 0 (1,540)  
Recoveries 5 270 31 638  
Reclassification   5,141   5,141  
Ending balance 11,116 11,732 11,116 11,732  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 155   155   103
ALLL for loans and leases collectively evaluated for impairment 10,961   10,961   10,232
Total allowance for loan and lease losses 11,116 11,732 11,116 11,732  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 2,573   2,573   2,272
Loans and leases collectively evaluated for impairment 339,448   339,448   317,575
Net loans and leases 342,021   342,021   319,847
Originated Loans | Commercial | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 94,217 82,119 100,257 80,229  
Provisions (1,961) (4,976) (8,940) (2,438)  
Charge-offs (272) (213) (440) (869)  
Recoveries 145 491 1,252 499  
Reclassification   27,421   27,421  
Ending balance 92,129 104,842 92,129 104,842  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 7,704   7,704   6,873
ALLL for loans and leases collectively evaluated for impairment 84,425   84,425   93,384
Total allowance for loan and lease losses 92,129 104,842 92,129 104,842  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 87,046   87,046   97,111
Loans and leases collectively evaluated for impairment 6,280,050   6,280,050   6,265,379
Net loans and leases 6,367,096   6,367,096   6,362,490
Originated Loans | Commercial | Other commercial real estate
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 945 1,915 1,009 2,059  
Provisions (155) (51) (229) (151)  
Charge-offs 0 (18) 0 (72)  
Recoveries 16 26 26 36  
Reclassification   (815)   (815)  
Ending balance 806 1,057 806 1,057  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 179   179   209
ALLL for loans and leases collectively evaluated for impairment 627   627   800
Total allowance for loan and lease losses 806 1,057 806 1,057  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 1,962   1,962   1,878
Loans and leases collectively evaluated for impairment 176,937   176,937   176,876
Net loans and leases 178,899   178,899   178,754
Originated Loans | Commercial | Commercial and industrial
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 24,021 13,661 22,362 14,050  
Provisions 3,033 (1,203) 5,009 (703)  
Charge-offs (531) (988) (1,027) (2,246)  
Recoveries 386 288 565 657  
Reclassification   7,551   7,551  
Ending balance 26,909 19,309 26,909 19,309  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 1,425   1,425   771
ALLL for loans and leases collectively evaluated for impairment 25,484   25,484   21,591
Total allowance for loan and lease losses 26,909 19,309 26,909 19,309  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 10,811   10,811   9,300
Loans and leases collectively evaluated for impairment 1,281,402   1,281,402   1,071,858
Net loans and leases 1,292,213   1,292,213   1,081,158
Originated Loans | Commercial | Lease financing
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,183 3,543 4,749 3,521  
Provisions 176 1,775 (348) 1,797  
Charge-offs (14) (92) (72) (92)  
Recoveries 20 19 36 19  
Reclassification   (253)   (253)  
Ending balance 4,365 4,992 4,365 4,992  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 297   297   54
ALLL for loans and leases collectively evaluated for impairment 4,068   4,068   4,695
Total allowance for loan and lease losses 4,365 4,992 4,365 4,992  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 376   376   188
Loans and leases collectively evaluated for impairment 413,046   413,046   381,575
Net loans and leases 413,422   413,422   381,763
Originated Loans | Commercial | Other
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 454 1,490 190 1,175  
Provisions 163 155 435 476  
Charge-offs (5) 0 (13) (6)  
Recoveries 0 3 0 3  
Reclassification   (1,288)   (1,288)  
Ending balance 612 360 612 360  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 0   0   0
ALLL for loans and leases collectively evaluated for impairment 612   612   190
Total allowance for loan and lease losses 612 360 612 360  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 46   46   0
Loans and leases collectively evaluated for impairment 131,005   131,005   175,336
Net loans and leases 131,051   131,051   175,336
Originated Loans | Noncommerical | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 10,944 3,790 10,511 3,836  
Provisions (1,557) 878 (948) 1,611  
Charge-offs (234) (450) (418) (1,268)  
Recoveries 148 61 156 100  
Reclassification   5,717   5,717  
Ending balance 9,301 9,996 9,301 9,996  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 1,613   1,613   1,586
ALLL for loans and leases collectively evaluated for impairment 7,688   7,688   8,925
Total allowance for loan and lease losses 9,301 9,996 9,301 9,996  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 15,448   15,448   15,539
Loans and leases collectively evaluated for impairment 1,055,641   1,055,641   966,882
Net loans and leases 1,071,089   1,071,089   982,421
Originated Loans | Noncommerical | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,249 1,419 681 1,721  
Provisions (323) (244) 254 (357)  
Charge-offs (23) 0 (94) (245)  
Recoveries 2 23 64 79  
Reclassification   (478)   (478)  
Ending balance 905 720 905 720  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 201   201   72
ALLL for loans and leases collectively evaluated for impairment 704   704   609
Total allowance for loan and lease losses 905 720 905 720  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 1,934   1,934   1,108
Loans and leases collectively evaluated for impairment 117,486   117,486   121,684
Net loans and leases 119,420   119,420   122,792
Originated Loans | Noncommerical | Revolving mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 16,408 24,499 16,239 25,185  
Provisions 1,252 907 2,605 2,338  
Charge-offs (1,064) (878) (2,324) (3,066)  
Recoveries 201 307 277 378  
Reclassification   (9,838)   (9,838)  
Ending balance 16,797 14,997 16,797 14,997  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 1,024   1,024   372
ALLL for loans and leases collectively evaluated for impairment 15,773   15,773   15,867
Total allowance for loan and lease losses 16,797 14,997 16,797 14,997  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 3,754   3,754   3,596
Loans and leases collectively evaluated for impairment 2,118,921   2,118,921   2,109,689
Net loans and leases 2,122,675   2,122,675   2,113,285
Originated Loans | Noncommerical | Consumer
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 13,282 24,027 13,541 25,389  
Provisions 2,737 1,694 4,012 2,290  
Charge-offs (2,628) (2,569) (4,805) (5,157)  
Recoveries 584 643 1,227 1,273  
Reclassification   (10,018)   (10,018)  
Ending balance 13,975 13,777 13,975 13,777  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 653   653   121
ALLL for loans and leases collectively evaluated for impairment 13,322   13,322   13,420
Total allowance for loan and lease losses 13,975 13,777 13,975 13,777  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 937   937   1,154
Loans and leases collectively evaluated for impairment 376,200   376,200   385,298
Net loans and leases 377,137   377,137   386,452
Originated Loans | Noncommerical | Non-specific
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 0 15,772 0 15,850  
Provisions 0 0 0 (78)  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Reclassification   (15,772)   (15,772)  
Ending balance 0 0 0 0  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 0 0 0 0  
Acquired Loans
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 44,993 96,473 53,520 139,972  
Provisions (9,529) (15,473) (11,802) (38,095)  
Charge-offs (6,133) (4,466) (12,387) (25,343)  
Recoveries 0 0 0 0  
Ending balance 29,331 76,534 29,331 76,534  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 29,331 76,534 29,331 76,534  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 29,331   29,331   53,520
Loans and leases acquired with deteriorated credit quality 1,109,933   1,109,933   1,029,426
Acquired Loans | Commercial | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,476 13,306 1,320 31,186  
Provisions (77) (5,091) 3,278 (18,238)  
Charge-offs (596) (626) (795) (5,359)  
Recoveries 0 0 0 0  
Ending balance 3,803 7,589 3,803 7,589  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 3,803 7,589 3,803 7,589  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 3,803   3,803   1,320
Loans and leases acquired with deteriorated credit quality 80,827   80,827   78,915
Acquired Loans | Commercial | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 23,003 38,293 29,906 50,275  
Provisions (1,185) (2,522) (4,571) (4,606)  
Charge-offs (4,503) (2,183) (8,020) (12,081)  
Recoveries 0 0 0 0  
Ending balance 17,315 33,588 17,315 33,588  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 17,315 33,588 17,315 33,588  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 17,315   17,315   29,906
Loans and leases acquired with deteriorated credit quality 637,481   637,481   642,891
Acquired Loans | Commercial | Other commercial real estate
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,204 5,172 1,354 11,234  
Provisions (797) (576) (947) (5,707)  
Charge-offs 0 0 0 (931)  
Recoveries 0 0 0 0  
Ending balance 407 4,596 407 4,596  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 407 4,596 407 4,596  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 407   407   1,354
Loans and leases acquired with deteriorated credit quality 34,688   34,688   41,381
Acquired Loans | Commercial | Commercial and industrial
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,256 11,876 5,275 8,897  
Provisions (1,729) (4,936) (2,065) (704)  
Charge-offs (152) (1,004) (2,835) (2,257)  
Recoveries 0 0 0 0  
Ending balance 375 5,936 375 5,936  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 375 5,936 375 5,936  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 375   375   5,275
Loans and leases acquired with deteriorated credit quality 33,851   33,851   17,254
Acquired Loans | Noncommerical | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 9,764 17,603 11,802 19,837  
Provisions (2,176) 55 (4,476) (1,450)  
Charge-offs (495) (386) (233) (1,115)  
Recoveries 0 0 0 0  
Ending balance 7,093 17,272 7,093 17,272  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 7,093 17,272 7,093 17,272  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 7,093   7,093   11,802
Loans and leases acquired with deteriorated credit quality 270,688   270,688   213,851
Acquired Loans | Noncommerical | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 583 2,756 682 8,287  
Provisions (583) (1,524) (682) (3,837)  
Charge-offs 0 0 0 (3,218)  
Recoveries 0 0 0 0  
Ending balance 0 1,232 0 1,232  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 0 1,232 0 1,232  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 0   0   682
Loans and leases acquired with deteriorated credit quality 28,759   28,759   2,583
Acquired Loans | Noncommerical | Revolving mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,493 7,135 2,959 9,754  
Provisions (3,031) (869) (2,397) (3,373)  
Charge-offs (381) (235) (481) (350)  
Recoveries 0 0 0 0  
Ending balance 81 6,031 81 6,031  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 81 6,031 81 6,031  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 81   81   2,959
Loans and leases acquired with deteriorated credit quality 20,129   20,129   30,834
Acquired Loans | Noncommerical | Consumer and Other
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 214 332 222 502  
Provisions 49 (10) 58 (180)  
Charge-offs (6) (32) (23) (32)  
Recoveries 0 0 0 0  
Ending balance 257 290 257 290  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 257 290 257 290  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 257   257   222
Loans and leases acquired with deteriorated credit quality $ 3,510   $ 3,510   $ 1,717