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Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 161,312   $ 161,312   $ 156,130
Unpaid principal balance 724,745 $ 999,926 724,745 $ 999,926  
Loans and Leases Receivable, Net Amount 26,969,686   26,969,686   25,299,564
Non-PCI impaired loans less than $500,000 collectively evaluated 42,800   42,800   47,100
Commercial          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 71,972   71,972   74,560
Commercial | Construction and land development          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 1,627   1,627   2,298
Commercial | Mortgage          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 57,270   57,270   61,065
Commercial | Other commercial real estate          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 474   474   860
Commercial | Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 12,341   12,341   10,046
Commercial | Other          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 260   260   291
Noncommercial          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 89,340   89,340   81,570
Noncommercial | Construction and land development          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 3,088   3,088   2,337
Noncommercial | Consumer and Other          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 3,208   3,208   3,021
Noncommercial | Mortgage          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 54,237   54,237   47,524
Noncommercial | Revolving mortgage          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 28,807   28,807   28,688
PCI Loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 17,400   17,400   18,200
Acquired loans which have adverse change in expected cash flows 99,000   99,000   186,600
Provision for Loan, Lease, and Other Losses (1,476) (1,514) (2,277) 1,000  
Financing Receivable, Allowance for Credit Losses, Write-downs 0 0 0 (117)  
Recoveries 0 0 0 0  
Non-PCI Loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 188,581   188,581   163,902
ALLL for loans and leases individually evaluated for impairment 10,895   10,895   9,827
Impaired Financing Receivable, with Related Allowance, Recorded Investment 118,781   118,781   115,073
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 54,343   54,343   31,357
Financing Receivable, Individually Evaluated for Impairment 173,124   173,124   146,430
Average balance 183,713 152,381 163,161 154,152  
Interest income recognized 1,373 1,350 4,013 4,092  
Provision for Loan, Lease, and Other Losses 8,242 2,354 25,991 15,883  
Financing Receivable, Allowance for Credit Losses, Write-downs (9,647) (9,447) (30,403) (28,739)  
Recoveries 3,123 2,939 9,802 9,277  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 209,063   209,063   204,741
Financing Receivable, Collectively Evaluated for Impairment 26,509,798   26,509,798   24,770,270
Loans and Leases Receivable, Net Amount 26,682,922   26,682,922   24,916,700
Non-PCI Loans | Commercial          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 91,319   91,319   79,865
ALLL for loans and leases individually evaluated for impairment 4,423   4,423   4,445
Impaired Financing Receivable, with Related Allowance, Recorded Investment 44,871   44,871   43,686
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 38,916   38,916   24,955
Financing Receivable, Individually Evaluated for Impairment 83,787   83,787   68,641
Average balance 91,050 76,318 78,011 80,549  
Interest income recognized 705 713 2,072 2,311  
Non-PCI Loans | Commercial | Construction and land development          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 6,146   6,146   2,606
ALLL for loans and leases individually evaluated for impairment 311   311   490
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2,018   2,018   1,897
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3,695   3,695   278
Financing Receivable, Individually Evaluated for Impairment 5,713   5,713   2,175
Average balance 6,130 2,101 3,460 1,580  
Interest income recognized 6 27 40 55  
Provision for Loan, Lease, and Other Losses 208 8,702 (3,217) 7,788  
Financing Receivable, Allowance for Credit Losses, Write-downs (116) (35) (188) (43)  
Recoveries 52 136 223 252  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 31,777   31,777   34,780
Financing Receivable, Collectively Evaluated for Impairment 938,034   938,034   755,679
Loans and Leases Receivable, Net Amount 943,747   943,747   757,854
Non-PCI Loans | Commercial | Mortgage          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 69,172   69,172   61,317
ALLL for loans and leases individually evaluated for impairment 2,850   2,850   2,671
Impaired Financing Receivable, with Related Allowance, Recorded Investment 35,222   35,222   34,177
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 29,158   29,158   21,270
Financing Receivable, Individually Evaluated for Impairment 64,380   64,380   55,447
Average balance 70,351 63,752 61,962 68,043  
Interest income recognized 551 583 1,653 1,953  
Provision for Loan, Lease, and Other Losses (1,337) (2,870) 4,748 (3,369)  
Financing Receivable, Allowance for Credit Losses, Write-downs (1) (606) (851) (1,111)  
Recoveries 226 99 502 563  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 45,000   45,000   40,780
Financing Receivable, Collectively Evaluated for Impairment 11,388,973   11,388,973   10,661,787
Loans and Leases Receivable, Net Amount 11,453,353   11,453,353   10,717,234
Non-PCI Loans | Commercial | Other commercial real estate          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 1,265   1,265   946
ALLL for loans and leases individually evaluated for impairment 12   12   42
Impaired Financing Receivable, with Related Allowance, Recorded Investment 195   195   243
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 976   976   617
Financing Receivable, Individually Evaluated for Impairment 1,171   1,171   860
Average balance 1,186 950 797 1,336  
Interest income recognized 6 10 20 33  
Provision for Loan, Lease, and Other Losses (90) (1,219) (230) (2,044)  
Financing Receivable, Allowance for Credit Losses, Write-downs 0 0 0 (69)  
Recoveries 0 1 1 147  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,240   2,240   2,439
Financing Receivable, Collectively Evaluated for Impairment 489,892   489,892   426,125
Loans and Leases Receivable, Net Amount 491,063   491,063   426,985
Non-PCI Loans | Commercial | Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 14,456   14,456   14,695
ALLL for loans and leases individually evaluated for impairment 1,191   1,191   1,137
Impaired Financing Receivable, with Related Allowance, Recorded Investment 7,238   7,238   7,153
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 5,024   5,024   2,715
Financing Receivable, Individually Evaluated for Impairment 12,262   12,262   9,868
Average balance 13,085 9,310 11,478 9,500  
Interest income recognized 140 92 353 269  
Provision for Loan, Lease, and Other Losses 4,714 (5,260) 10,138 (907)  
Financing Receivable, Allowance for Credit Losses, Write-downs (3,047) (2,106) (8,327) (6,874)  
Recoveries 611 497 1,748 2,399  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 57,988   57,988   54,483
Financing Receivable, Collectively Evaluated for Impairment 4,117,122   4,117,122   3,928,862
Loans and Leases Receivable, Net Amount 4,129,384   4,129,384   3,938,730
Non-PCI Loans | Commercial | Other          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 280   280   301
ALLL for loans and leases individually evaluated for impairment 59   59   105
Impaired Financing Receivable, with Related Allowance, Recorded Investment 198   198   216
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 63   63   75
Financing Receivable, Individually Evaluated for Impairment 261   261   291
Average balance 298 205 314 90  
Interest income recognized 2 1 6 1  
Provision for Loan, Lease, and Other Losses 54 (2,404) (618) (2,403)  
Financing Receivable, Allowance for Credit Losses, Write-downs (42) (56) (73) (98)  
Recoveries 20 117 685 160  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,156   2,156   2,116
Financing Receivable, Collectively Evaluated for Impairment 301,530   301,530   296,133
Loans and Leases Receivable, Net Amount 301,791   301,791   296,424
Non-PCI Loans | Noncommercial          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 97,262   97,262   84,037
ALLL for loans and leases individually evaluated for impairment 6,472   6,472   5,382
Impaired Financing Receivable, with Related Allowance, Recorded Investment 73,910   73,910   71,387
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 15,427   15,427   6,402
Financing Receivable, Individually Evaluated for Impairment 89,337   89,337   77,789
Average balance 92,663 76,063 85,150 73,603  
Interest income recognized 668 637 1,941 1,781  
Non-PCI Loans | Noncommercial | Construction and land development          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 3,381   3,381   4,035
ALLL for loans and leases individually evaluated for impairment 88   88   81
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,676   1,676   2,337
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,412   1,412   1,412
Financing Receivable, Individually Evaluated for Impairment 3,088   3,088   3,749
Average balance 3,124 3,190 3,473 3,607  
Interest income recognized 25 42 93 134  
Provision for Loan, Lease, and Other Losses 148 (1,203) 548 (1,046)  
Financing Receivable, Allowance for Credit Losses, Write-downs 0 0 0 (219)  
Recoveries 0 0 0 127  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,810   2,810   2,269
Financing Receivable, Collectively Evaluated for Impairment 318,815   318,815   253,281
Loans and Leases Receivable, Net Amount 321,903   321,903   257,030
Non-PCI Loans | Noncommercial | Mortgage          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 58,515   58,515   45,226
ALLL for loans and leases individually evaluated for impairment 2,761   2,761   1,901
Impaired Financing Receivable, with Related Allowance, Recorded Investment 44,009   44,009   40,359
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10,302   10,302   1,809
Financing Receivable, Individually Evaluated for Impairment 54,311   54,311   42,168
Average balance 56,029 42,601 49,048 41,124  
Interest income recognized 346 330 988 903  
Provision for Loan, Lease, and Other Losses 1,024 (1,828) 2,903 1,176  
Financing Receivable, Allowance for Credit Losses, Write-downs (313) (360) (957) (1,455)  
Recoveries 68 128 293 315  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 14,950   14,950   13,571
Financing Receivable, Collectively Evaluated for Impairment 4,815,251   4,815,251   4,223,519
Loans and Leases Receivable, Net Amount 4,869,562   4,869,562   4,265,687
Non-PCI Loans | Noncommercial | Revolving mortgage          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 31,772   31,772   31,371
ALLL for loans and leases individually evaluated for impairment 2,559   2,559   2,515
Impaired Financing Receivable, with Related Allowance, Recorded Investment 25,070   25,070   25,751
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3,660   3,660   3,101
Financing Receivable, Individually Evaluated for Impairment 28,730   28,730   28,852
Average balance 30,067 27,503 29,477 26,228  
Interest income recognized 260 234 763 657  
Provision for Loan, Lease, and Other Losses (153) 465 (272) 1,220  
Financing Receivable, Allowance for Credit Losses, Write-downs (534) (759) (1,990) (2,778)  
Recoveries 201 712 1,035 1,426  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 18,076   18,076   19,347
Financing Receivable, Collectively Evaluated for Impairment 2,386,154   2,386,154   2,514,123
Loans and Leases Receivable, Net Amount 2,414,884   2,414,884   2,542,975
Non-PCI Loans | Noncommercial | Consumer          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 3,594   3,594   3,405
ALLL for loans and leases individually evaluated for impairment 1,064   1,064   885
Impaired Financing Receivable, with Related Allowance, Recorded Investment 3,155   3,155   2,940
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 53   53   80
Financing Receivable, Individually Evaluated for Impairment 3,208   3,208   3,020
Average balance 3,443 2,769 3,152 2,644  
Interest income recognized 37 31 97 87  
Provision for Loan, Lease, and Other Losses 3,674 7,971 11,991 15,468  
Financing Receivable, Allowance for Credit Losses, Write-downs (5,594) (5,525) (18,017) (16,092)  
Recoveries 1,945 $ 1,249 5,315 $ 3,888  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 34,066   34,066   34,956
Financing Receivable, Collectively Evaluated for Impairment 1,754,027   1,754,027   1,710,761
Loans and Leases Receivable, Net Amount $ 1,757,235   $ 1,757,235   $ 1,713,781