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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Net loans and leases         $ 20,534,563 $ 20,033,774    
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         921,467 950,516 $ 1,123,239 $ 1,186,498
Allowance for loan and lease losses         208,008 206,216    
Commercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         576,942 593,614    
Commercial | Construction and land development                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         27,742 33,880    
Commercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         513,021 525,468    
Commercial | Other commercial real estate                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         20,166 17,076    
Commercial | Commercial and industrial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         12,854 15,182    
Commercial | Other                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         3,159 2,008    
Noncommercial                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         344,525 356,902    
Noncommercial | Construction and land development                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         467 0    
Noncommercial | Mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         294,625 302,158    
Noncommercial | Revolving mortgage                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         47,230 52,471    
Noncommercial | Consumer                
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         2,203 2,273    
Non-PCI Loans                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance         9,259 7,200    
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance $ 193,026 $ 187,934 $ 189,904 $ 182,837        
Provision for Loan, Lease, and Other Losses 6,708 8,994 13,548 17,650        
Charge-offs (5,841) (6,050) (12,061) (12,080)        
Recoveries 2,560 1,971 5,062 4,442        
Ending balance 196,453 192,849 196,453 192,849        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         130,393 150,367    
Loans and leases collectively evaluated for impairment         19,690,711 19,139,107    
Net loans and leases         19,821,104 19,289,474    
ALLL for loans and leases individually evaluated for impairment         9,259 7,200    
ALLL for loans and leases collectively evaluated for impairment         187,194 182,704    
Total allowance for loan and lease losses 193,026 187,934 189,904 182,837 196,453 189,904 192,849 182,837
Non-PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 16,885 13,108 16,288 11,961        
Provision for Loan, Lease, and Other Losses 291 88 1,234 1,191        
Charge-offs (136) (221) (562) (239)        
Recoveries 129 104 209 166        
Ending balance 17,169 13,079 17,169 13,079        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         3,299 3,094    
Loans and leases collectively evaluated for impairment         621,507 617,258    
Net loans and leases         624,806 620,352    
ALLL for loans and leases individually evaluated for impairment         333 123    
ALLL for loans and leases collectively evaluated for impairment         16,836 16,165    
Total allowance for loan and lease losses 16,885 13,108 16,288 11,961 17,169 16,288 13,079 11,961
Non-PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 70,456 82,038 69,896 85,189        
Provision for Loan, Lease, and Other Losses 701 (1,878) 1,096 (5,557)        
Charge-offs (44) (47) (134) (280)        
Recoveries 500 323 755 1,084        
Ending balance 71,613 80,436 71,613 80,436        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         77,620 95,107    
Loans and leases collectively evaluated for impairment         8,427,639 8,179,441    
Net loans and leases         8,505,259 8,274,548    
ALLL for loans and leases individually evaluated for impairment         4,248 3,370    
ALLL for loans and leases collectively evaluated for impairment         67,365 66,526    
Total allowance for loan and lease losses 70,456 82,038 69,896 85,189 71,613 69,896 80,436 85,189
Non-PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 2,207 1,031 2,168 732        
Provision for Loan, Lease, and Other Losses (79) (227) (184) 231        
Charge-offs 0 (9) 0 (178)        
Recoveries 10 9 154 19        
Ending balance 2,138 804 2,138 804        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,551 427    
Loans and leases collectively evaluated for impairment         336,067 320,594    
Net loans and leases         337,618 321,021    
ALLL for loans and leases individually evaluated for impairment         119 289    
ALLL for loans and leases collectively evaluated for impairment         2,019 1,879    
Total allowance for loan and lease losses 2,207 1,031 2,168 732 2,138 2,168 804 732
Non-PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 44,479 36,954 43,116 30,727        
Provision for Loan, Lease, and Other Losses 81 4,547 2,282 12,093        
Charge-offs (1,177) (2,318) (2,494) (4,031)        
Recoveries 525 209 1,004 603        
Ending balance 43,908 39,392 43,908 39,392        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         10,220 17,910    
Loans and leases collectively evaluated for impairment         2,375,939 2,351,048    
Net loans and leases         2,386,159 2,368,958    
ALLL for loans and leases individually evaluated for impairment         971 1,118    
ALLL for loans and leases collectively evaluated for impairment         42,937 41,998    
Total allowance for loan and lease losses 44,479 36,954 43,116 30,727 43,908 43,116 39,392 30,727
Non-PCI Loans | Commercial | Lease financing                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 5,422 4,293 5,524 4,286        
Provision for Loan, Lease, and Other Losses 343 408 62 419        
Charge-offs 0 (6) 0 (21)        
Recoveries 1 11 180 22        
Ending balance 5,766 4,706 5,766 4,706        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,233 1,755    
Loans and leases collectively evaluated for impairment         783,628 729,023    
Net loans and leases         784,861 730,778    
ALLL for loans and leases individually evaluated for impairment         45 213    
ALLL for loans and leases collectively evaluated for impairment         5,721 5,311    
Total allowance for loan and lease losses 5,422 4,293 5,524 4,286 5,766 5,524 4,706 4,286
Non-PCI Loans | Commercial | Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 1,777 2,981 1,855 3,184        
Provision for Loan, Lease, and Other Losses 37 (1,824) (290) (2,042)        
Charge-offs (88) 0 (160) 0        
Recoveries 29 31 350 46        
Ending balance 1,755 1,188 1,755 1,188        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         695 1,183    
Loans and leases collectively evaluated for impairment         364,574 313,649    
Net loans and leases         365,269 314,832    
ALLL for loans and leases individually evaluated for impairment         0 0    
ALLL for loans and leases collectively evaluated for impairment         1,755 1,855    
Total allowance for loan and lease losses 1,777 2,981 1,855 3,184 1,755 1,855 1,188 3,184
Non-PCI Loans | Noncommercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 1,575 1,056 1,485 892        
Provision for Loan, Lease, and Other Losses 78 74 165 192        
Charge-offs 0 0 0 (22)        
Recoveries 0 3 3 71        
Ending balance 1,653 1,133 1,653 1,133        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         411 784    
Loans and leases collectively evaluated for impairment         225,911 219,289    
Net loans and leases         226,322 220,073    
ALLL for loans and leases individually evaluated for impairment         0 49    
ALLL for loans and leases collectively evaluated for impairment         1,653 1,436    
Total allowance for loan and lease losses 1,575 1,056 1,485 892 1,653 1,485 1,133 892
Non-PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 14,727 11,328 14,105 10,661        
Provision for Loan, Lease, and Other Losses 1,487 1,162 2,262 1,975        
Charge-offs (179) (90) (352) (374)        
Recoveries 41 305 61 443        
Ending balance 16,076 12,705 16,076 12,705        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         26,780 22,986    
Loans and leases collectively evaluated for impairment         2,751,083 2,672,999    
Net loans and leases         2,777,863 2,695,985    
ALLL for loans and leases individually evaluated for impairment         1,992 1,212    
ALLL for loans and leases collectively evaluated for impairment         14,084 12,893    
Total allowance for loan and lease losses 14,727 11,328 14,105 10,661 16,076 14,105 12,705 10,661
Non-PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 16,125 17,529 15,971 18,650        
Provision for Loan, Lease, and Other Losses 1,470 31 2,628 (431)        
Charge-offs (1,081) (616) (2,116) (1,409)        
Recoveries 214 346 245 480        
Ending balance 16,728 17,290 16,728 17,290        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         7,113 5,883    
Loans and leases collectively evaluated for impairment         2,526,415 2,517,223    
Net loans and leases         2,533,528 2,523,106    
ALLL for loans and leases individually evaluated for impairment         868 299    
ALLL for loans and leases collectively evaluated for impairment         15,860 15,672    
Total allowance for loan and lease losses 16,125 17,529 15,971 18,650 16,728 15,971 17,290 18,650
Non-PCI Loans | Noncommercial | Consumer                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 19,373 17,616 19,496 16,555        
Provision for Loan, Lease, and Other Losses 2,299 6,613 4,293 9,579        
Charge-offs (3,136) (2,743) (6,243) (5,526)        
Recoveries 1,111 630 2,101 1,508        
Ending balance 19,647 22,116 19,647 22,116        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Loans and leases individually evaluated for impairment         1,471 1,238    
Loans and leases collectively evaluated for impairment         1,277,948 1,218,583    
Net loans and leases         1,279,419 1,219,821    
ALLL for loans and leases individually evaluated for impairment         683 527    
ALLL for loans and leases collectively evaluated for impairment         18,964 18,969    
Total allowance for loan and lease losses 19,373 17,616 19,496 16,555 19,647 19,496 22,116 16,555
PCI Loans                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 13,757 17,619 16,312 21,629        
Provision for Loan, Lease, and Other Losses (2,146) (1,275) (4,143) (4,139)        
Charge-offs (56) (876) (614) (2,022)        
Recoveries 0 0 0 0        
Ending balance 11,555 15,468 11,555 15,468        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 13,757 17,619 16,312 21,629 11,555 16,312 15,468 21,629
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         921,467 950,516    
PCI Loans | Commercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 733 341 1,082 150        
Provision for Loan, Lease, and Other Losses (453) 325 (802) 516        
Charge-offs 0 (97) 0 (97)        
Recoveries 0 0 0 0        
Ending balance 280 569 280 569        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 733 341 1,082 150 280 1,082 569 150
PCI Loans | Commercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 6,750 8,876 7,838 10,135        
Provision for Loan, Lease, and Other Losses (935) (2,065) (1,914) (2,990)        
Charge-offs (56) (383) (165) (717)        
Recoveries 0 0 0 0        
Ending balance 5,759 6,428 5,759 6,428        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 6,750 8,876 7,838 10,135 5,759 7,838 6,428 10,135
PCI Loans | Commercial | Other commercial real estate                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 770 194 773 75        
Provision for Loan, Lease, and Other Losses (154) (125) (152) (6)        
Charge-offs 0 0 (5) 0        
Recoveries 0 0 0 0        
Ending balance 616 69 616 69        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 770 194 773 75 616 773 69 75
PCI Loans | Commercial | Commercial and industrial                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 225 11 445 1,240        
Provision for Loan, Lease, and Other Losses 60 399 (160) (632)        
Charge-offs 0 (87) 0 (285)        
Recoveries 0 0 0 0        
Ending balance 285 323 285 323        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 225 11 445 1,240 285 445 323 1,240
PCI Loans | Noncommercial | Construction and land development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 0 31 0 183        
Provision for Loan, Lease, and Other Losses 0 (31) 0 (183)        
Charge-offs 0 0 0 0        
Recoveries 0 0 0 0        
Ending balance 0 0 0 0        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 0 31 0 183 0 0 0 183
PCI Loans | Noncommercial | Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 4,680 4,872 5,398 5,820        
Provision for Loan, Lease, and Other Losses (382) 1,165 (729) 302        
Charge-offs 0 (195) (371) (280)        
Recoveries 0 0 0 0        
Ending balance 4,298 5,842 4,298 5,842        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 4,680 4,872 5,398 5,820 4,298 5,398 5,842 5,820
PCI Loans | Noncommercial | Revolving mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 415 3,271 523 3,999        
Provision for Loan, Lease, and Other Losses (177) (1,112) (285) (1,767)        
Charge-offs 0 (108) 0 (181)        
Recoveries 0 0 0 0        
Ending balance 238 2,051 238 2,051        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses 415 3,271 523 3,999 238 523 2,051 3,999
PCI Loans | Noncommercial | Consumer and Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance 184 23 253 27        
Provision for Loan, Lease, and Other Losses (105) 169 (101) 621        
Charge-offs 0 (6) (73) (462)        
Recoveries 0 0 0 0        
Ending balance 79 186 79 186        
Allowance for Loans and Leases Evaluated for Impairment [Abstract]                
Total allowance for loan and lease losses $ 184 $ 23 $ 253 $ 27 79 253 $ 186 $ 27
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract]                
Loans and leases acquired with deteriorated credit quality         $ 5,362 $ 4,281