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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Loans and Leases Evaluated for Impairment [Abstract]          
Net loans and leases $ 13,601,886   $ 13,601,886   $ 12,900,330
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
Allowance for loan and lease losses 200,905   200,905   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 176,915 181,782 179,874 179,046  
Provisions 1,734 4,932 4,334 11,179  
Charge-offs (5,387) (10,226) (14,578) (24,787)  
Recoveries 1,843 1,794 5,475 5,476  
Reclassification       7,368  
Ending balance 175,105 178,282 175,105 178,282  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 12,738   12,738   10,161
ALLL for loans and leases collectively evaluated for impairment 162,367   162,367   169,713
Total allowance for loan and lease losses 175,105 178,282 175,105 178,282  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 125,411   125,411   132,146
Loans and leases collectively evaluated for impairment 12,681,100   12,681,100   11,972,152
Net loans and leases 12,806,511   12,806,511   12,104,298
Originated Loans | Commercial | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 11,116 11,732 10,335 6,031  
Provisions 1,469 1,797 2,219 3,259  
Charge-offs 0 (3,030) 0 (4,570)  
Recoveries 15 84 46 722  
Reclassification       5,141  
Ending balance 12,600 10,583 12,600 10,583  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 382   382   103
ALLL for loans and leases collectively evaluated for impairment 12,218   12,218   10,232
Total allowance for loan and lease losses 12,600 10,583 12,600 10,583  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 2,068   2,068   2,272
Loans and leases collectively evaluated for impairment 380,707   380,707   317,575
Net loans and leases 382,775   382,775   319,847
Originated Loans | Commercial | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 92,129 104,842 100,257 80,229  
Provisions (8,082) (5,256) (17,021) (7,695)  
Charge-offs (277) (794) (718) (1,662)  
Recoveries 476 241 1,728 740  
Reclassification       27,421  
Ending balance 84,246 99,033 84,246 99,033  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 5,811   5,811   6,873
ALLL for loans and leases collectively evaluated for impairment 78,435   78,435   93,384
Total allowance for loan and lease losses 84,246 99,033 84,246 99,033  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 88,735   88,735   97,111
Loans and leases collectively evaluated for impairment 6,386,631   6,386,631   6,265,379
Net loans and leases 6,475,366   6,475,366   6,362,490
Originated Loans | Commercial | Other commercial real estate
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 806 1,057 1,009 2,059  
Provisions 61 (56) (167) (207)  
Charge-offs 0 (5) 0 (77)  
Recoveries 8 39 33 75  
Reclassification       (815)  
Ending balance 875 1,035 875 1,035  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 173   173   209
ALLL for loans and leases collectively evaluated for impairment 702   702   800
Total allowance for loan and lease losses 875 1,035 875 1,035  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 1,966   1,966   1,878
Loans and leases collectively evaluated for impairment 175,715   175,715   176,876
Net loans and leases 177,681   177,681   178,754
Originated Loans | Commercial | Commercial and industrial
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 26,909 19,309 22,362 14,050  
Provisions 4,361 4,656 9,369 3,951  
Charge-offs (1,414) (1,671) (2,440) (3,917)  
Recoveries 227 344 792 1,003  
Reclassification       7,551  
Ending balance 30,083 22,638 30,083 22,638  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 3,042   3,042   771
ALLL for loans and leases collectively evaluated for impairment 27,041   27,041   21,591
Total allowance for loan and lease losses 30,083 22,638 30,083 22,638  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 11,484   11,484   9,300
Loans and leases collectively evaluated for impairment 1,348,461   1,348,461   1,071,858
Net loans and leases 1,359,945   1,359,945   1,081,158
Originated Loans | Commercial | Lease financing
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,365 4,992 4,749 3,521  
Provisions (71) (439) (420) 1,358  
Charge-offs (28) (31) (100) (123)  
Recoveries 34 71 71 90  
Reclassification       (253)  
Ending balance 4,300 4,593 4,300 4,593  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 151   151   54
ALLL for loans and leases collectively evaluated for impairment 4,149   4,149   4,695
Total allowance for loan and lease losses 4,300 4,593 4,300 4,593  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 281   281   188
Loans and leases collectively evaluated for impairment 443,037   443,037   381,575
Net loans and leases 443,318   443,318   381,763
Originated Loans | Commercial | Other
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 612 360 190 1,175  
Provisions 127 (171) 562 307  
Charge-offs 0 0 (13) (6)  
Recoveries 0 0 0 1  
Reclassification       (1,288)  
Ending balance 739 189 739 189  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 6   6   0
ALLL for loans and leases collectively evaluated for impairment 733   733   190
Total allowance for loan and lease losses 739 189 739 189  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 40   40   0
Loans and leases collectively evaluated for impairment 213,184   213,184   175,336
Net loans and leases 213,224   213,224   175,336
Originated Loans | Noncommerical | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 9,301 9,996 10,511 3,836  
Provisions 15 515 (933) 2,126  
Charge-offs (231) (719) (649) (1,987)  
Recoveries 28 253 184 353  
Reclassification       5,717  
Ending balance 9,113 10,045 9,113 10,045  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 1,416   1,416   1,586
ALLL for loans and leases collectively evaluated for impairment 7,697   7,697   8,925
Total allowance for loan and lease losses 9,113 10,045 9,113 10,045  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 14,800   14,800   15,539
Loans and leases collectively evaluated for impairment 1,126,249   1,126,249   966,882
Net loans and leases 1,141,049   1,141,049   982,421
Originated Loans | Noncommerical | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 905 720 681 1,721  
Provisions 21 (214) 274 (571)  
Charge-offs (45) (59) (138) (304)  
Recoveries 14 101 78 180  
Reclassification       (478)  
Ending balance 895 548 895 548  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 103   103   72
ALLL for loans and leases collectively evaluated for impairment 792   792   609
Total allowance for loan and lease losses 895 548 895 548  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 1,498   1,498   1,108
Loans and leases collectively evaluated for impairment 115,711   115,711   121,684
Net loans and leases 117,209   117,209   122,792
Originated Loans | Noncommerical | Revolving mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 16,797 14,997 16,239 25,185  
Provisions 2,075 2,206 4,681 4,546  
Charge-offs (925) (1,472) (3,249) (4,540)  
Recoveries 174 84 450 462  
Reclassification       (9,838)  
Ending balance 18,121 15,815 18,121 15,815  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 1,060   1,060   372
ALLL for loans and leases collectively evaluated for impairment 17,061   17,061   15,867
Total allowance for loan and lease losses 18,121 15,815 18,121 15,815  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 3,497   3,497   3,596
Loans and leases collectively evaluated for impairment 2,116,670   2,116,670   2,109,689
Net loans and leases 2,120,167   2,120,167   2,113,285
Originated Loans | Noncommerical | Consumer
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 13,975 13,777 13,541 25,389  
Provisions 1,758 1,894 5,770 4,183  
Charge-offs (2,467) (2,445) (7,271) (7,601)  
Recoveries 867 577 2,093 1,850  
Reclassification       (10,018)  
Ending balance 14,133 13,803 14,133 13,803  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
ALLL for loans and leases individually evaluated for impairment 594   594   121
ALLL for loans and leases collectively evaluated for impairment 13,539   13,539   13,420
Total allowance for loan and lease losses 14,133 13,803 14,133 13,803  
Loans and Leases Evaluated for Impairment [Abstract]          
Loans and leases individually evaluated for impairment 1,042   1,042   1,154
Loans and leases collectively evaluated for impairment 374,735   374,735   385,298
Net loans and leases 375,777   375,777   386,452
Originated Loans | Noncommerical | Non-specific
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 0 0 0 15,850  
Provisions 0 0 0 (78)  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Reclassification       (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 29,331 76,534 53,520 139,972  
Provisions (197) (12,615) (11,999) (50,710)  
Charge-offs (3,334) (4,402) (15,721) (29,745)  
Recoveries 0 0 0 0  
Ending balance 25,800 59,517 25,800 59,517  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 25,800 59,517 25,800 59,517  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 25,800   25,800   53,520
Loans and leases acquired with deteriorated credit quality 996,280   996,280   1,029,426
Acquired Loans | Commercial | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,803 7,589 1,320 31,186  
Provisions (1,815) (3,707) 1,463 (25,132)  
Charge-offs (1,633) (1,263) (2,428) (3,435)  
Recoveries 0 0 0 0  
Ending balance 355 2,619 355 2,619  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 355 2,619 355 2,619  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 355   355   1,320
Loans and leases acquired with deteriorated credit quality 59,808   59,808   78,915
Acquired Loans | Commercial | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 17,315 33,588 29,906 50,275  
Provisions (2,374) (1,944) (6,946) (10,809)  
Charge-offs (2,357) (2,324) (10,376) (10,146)  
Recoveries 0 0 0 0  
Ending balance 12,584 29,320 12,584 29,320  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 12,584 29,320 12,584 29,320  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 12,584   12,584   29,906
Loans and leases acquired with deteriorated credit quality 579,435   579,435   642,891
Acquired Loans | Commercial | Other commercial real estate
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 407 4,596 1,354 11,234  
Provisions (435) (2,673) (1,382) (2,689)  
Charge-offs 106 0 106 (6,622)  
Recoveries 0 0 0 0  
Ending balance 78 1,923 78 1,923  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 78 1,923 78 1,923  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 78   78   1,354
Loans and leases acquired with deteriorated credit quality 36,043   36,043   41,381
Acquired Loans | Commercial | Commercial and industrial
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 375 5,936 5,275 8,897  
Provisions 182 (73) (1,883) 2,067  
Charge-offs 839 (89) (1,996) (5,190)  
Recoveries 0 0 0 0  
Ending balance 1,396 5,774 1,396 5,774  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 1,396 5,774 1,396 5,774  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 1,396   1,396   5,275
Loans and leases acquired with deteriorated credit quality 25,797   25,797   17,254
Acquired Loans | Noncommerical | Mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 7,093 17,272 11,802 19,837  
Provisions 187 (2,445) (4,289) (3,546)  
Charge-offs (188) (509) (421) (1,973)  
Recoveries 0 0 0 0  
Ending balance 7,092 14,318 7,092 14,318  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 7,092 14,318 7,092 14,318  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 7,092   7,092   11,802
Loans and leases acquired with deteriorated credit quality 240,681   240,681   213,851
Acquired Loans | Noncommerical | Construction and land development
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 0 1,232 682 8,287  
Provisions 239 (467) (443) (7,739)  
Charge-offs (83) (217) (83) 0  
Recoveries 0 0 0 0  
Ending balance 156 548 156 548  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 156 548 156 548  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 156   156   682
Loans and leases acquired with deteriorated credit quality 1,144   1,144   2,583
Acquired Loans | Noncommerical | Revolving mortgage
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 81 6,031 2,959 9,754  
Provisions 3,899 (1,195) 1,502 (4,918)  
Charge-offs (1) 0 (482) 0  
Recoveries 0 0 0 0  
Ending balance 3,979 4,836 3,979 4,836  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 3,979 4,836 3,979 4,836  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 3,979   3,979   2,959
Loans and leases acquired with deteriorated credit quality 50,048   50,048   30,834
Acquired Loans | Noncommerical | Consumer and Other
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 257 290 222 502  
Provisions (80) (111) (21) 2,056  
Charge-offs (17) 0 (41) (2,379)  
Recoveries 0 0 0 0  
Ending balance 160 179 160 179  
Allowance for Loans and Leases Evaluated for Impairment [Abstract]          
Total allowance for loan and lease losses 160 179 160 179  
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]          
ALLL for loans and leases acquired with deteriorated credit quality 160   160   222
Loans and leases acquired with deteriorated credit quality $ 3,324   $ 3,324   $ 1,717