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Loans - Schedule of Aging of Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable    
Discount/Premium $ 21,600 $ 18,700
Total Acquired Loans, Net of Unearned Income $ 14,511,188 14,098,211
Past due loans threshold period 90 days  
Legacy Loans    
Accounts, Notes, Loans and Financing Receivable    
Total past due $ 141,355 71,661
Current 11,843,494 11,118,859
Total Acquired Loans, Net of Unearned Income 11,984,849 11,190,520
Recorded Investment 90 days and Accruing 353 624
Legacy Loans | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 29,433 13,839
Legacy Loans | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 16,473 6,270
Legacy Loans | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 95,449 51,552
Legacy Loans | Commercial Loans    
Accounts, Notes, Loans and Financing Receivable    
Total Acquired Loans, Net of Unearned Income 8,784,789 8,133,341
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction    
Accounts, Notes, Loans and Financing Receivable    
Total past due 85 921
Current 695,124 635,560
Total Acquired Loans, Net of Unearned Income 695,209 636,481
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4 801
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 55 0
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 26 120
Legacy Loans | Commercial Loans | Commercial Real Estate - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 16,531 18,997
Current 4,385,949 3,848,584
Total Acquired Loans, Net of Unearned Income 4,402,480 3,867,581
Recorded Investment 90 days and Accruing 8 95
Legacy Loans | Commercial Loans | Commercial Real Estate - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 12,558 2,687
Legacy Loans | Commercial Loans | Commercial Real Estate - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 316 793
Legacy Loans | Commercial Loans | Commercial Real Estate - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,657 15,517
Legacy Loans | Commercial Loans | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Total past due 24,437 8,693
Current 3,003,153 2,943,409
Total Acquired Loans, Net of Unearned Income 3,027,590 2,952,102
Recorded Investment 90 days and Accruing 0 87
Legacy Loans | Commercial Loans | Commercial and Industrial | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,233 1,208
Legacy Loans | Commercial Loans | Commercial and Industrial | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 11,588 739
Legacy Loans | Commercial Loans | Commercial and Industrial | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 9,616 6,746
Legacy Loans | Commercial Loans | Energy-Related    
Accounts, Notes, Loans and Financing Receivable    
Total past due 63,821 7,096
Current 595,689 670,081
Total Acquired Loans, Net of Unearned Income 659,510 677,177
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Commercial Loans | Energy-Related | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,055 15
Legacy Loans | Commercial Loans | Energy-Related | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Legacy Loans | Commercial Loans | Energy-Related | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 60,766 7,081
Legacy Loans | Residential Mortgage Loans | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable    
Total past due 16,607 17,676
Current 778,094 676,347
Total Acquired Loans, Net of Unearned Income 794,701 694,023
Recorded Investment 90 days and Accruing 239 442
Legacy Loans | Residential Mortgage Loans | Residential Mortgage | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,367 1,075
Legacy Loans | Residential Mortgage Loans | Residential Mortgage | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,178 2,485
Legacy Loans | Residential Mortgage Loans | Residential Mortgage | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 13,062 14,116
Legacy Loans | Consumer - Other | Consumer - Home Equity    
Accounts, Notes, Loans and Financing Receivable    
Total past due 10,640 10,047
Current 1,684,473 1,565,596
Total Acquired Loans, Net of Unearned Income 1,695,113 1,575,643
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Consumer - Other | Consumer - Home Equity | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4,011 3,549
Legacy Loans | Consumer - Other | Consumer - Home Equity | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,038 870
Legacy Loans | Consumer - Other | Consumer - Home Equity | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 5,591 5,628
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4,502 3,886
Current 177,697 242,328
Total Acquired Loans, Net of Unearned Income 182,199 246,214
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,749 2,187
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 381 518
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,372 1,181
Legacy Loans | Consumer - Other | Consumer - Credit Card    
Accounts, Notes, Loans and Financing Receivable    
Total past due 900 901
Current 77,144 76,360
Total Acquired Loans, Net of Unearned Income 78,044 77,261
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Consumer - Other | Consumer - Credit Card | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 249 394
Legacy Loans | Consumer - Other | Consumer - Credit Card | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 119 113
Legacy Loans | Consumer - Other | Consumer - Credit Card | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 532 394
Legacy Loans | Consumer - Other | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,832 3,444
Current 446,171 460,594
Total Acquired Loans, Net of Unearned Income 450,003 464,038
Recorded Investment 90 days and Accruing 106 0
Legacy Loans | Consumer - Other | Consumer - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,207 1,923
Legacy Loans | Consumer - Other | Consumer - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 798 752
Legacy Loans | Consumer - Other | Consumer - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 827 769
Acquired Loans    
Accounts, Notes, Loans and Financing Receivable    
Total past due 92,389 120,313
Current 2,759,569 3,137,451
Discount/Premium (114,246) (120,856)
Total Acquired Loans, Net of Unearned Income 2,737,712 3,136,908
Recorded Investment 90 days and Accruing 72,801 99,422
Acquired Loans | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 7,683 9,039
Acquired Loans | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 5,263 6,431
Acquired Loans | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 79,443 104,843
Acquired Loans | Commercial Loans    
Accounts, Notes, Loans and Financing Receivable    
Total Acquired Loans, Net of Unearned Income 1,785,055 2,065,514
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4,438 7,327
Current 91,715 107,992
Discount/Premium 11,243 10,107
Total Acquired Loans, Net of Unearned Income 107,396 125,426
Recorded Investment 90 days and Accruing 4,254 6,994
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 184 216
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 117
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4,254 6,994
Acquired Loans | Commercial Loans | Commercial Real Estate - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 41,532 59,877
Current 1,276,868 1,447,441
Discount/Premium (51,484) (63,295)
Total Acquired Loans, Net of Unearned Income 1,266,916 1,444,023
Recorded Investment 90 days and Accruing 36,932 52,067
Acquired Loans | Commercial Loans | Commercial Real Estate - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,855 4,295
Acquired Loans | Commercial Loans | Commercial Real Estate - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 730 2,024
Acquired Loans | Commercial Loans | Commercial Real Estate - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 38,947 53,558
Acquired Loans | Commercial Loans | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Total past due 6,880 9,121
Current 414,406 490,255
Discount/Premium (13,067) (6,900)
Total Acquired Loans, Net of Unearned Income 408,219 492,476
Recorded Investment 90 days and Accruing 1,840 5,674
Acquired Loans | Commercial Loans | Commercial and Industrial | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,707 1,016
Acquired Loans | Commercial Loans | Commercial and Industrial | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 719 1,276
Acquired Loans | Commercial Loans | Commercial and Industrial | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,454 6,829
Acquired Loans | Commercial Loans | Energy-Related    
Accounts, Notes, Loans and Financing Receivable    
Total past due 48 1,368
Current 2,512 2,221
Discount/Premium (36) 0
Total Acquired Loans, Net of Unearned Income 2,524 3,589
Recorded Investment 90 days and Accruing 0 1,198
Acquired Loans | Commercial Loans | Energy-Related | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Commercial Loans | Energy-Related | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Commercial Loans | Energy-Related | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 48 1,368
Acquired Loans | Residential Mortgage Loans | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable    
Total past due 23,721 24,752
Current 464,518 506,103
Discount/Premium (33,878) (29,559)
Total Acquired Loans, Net of Unearned Income 454,361 501,296
Recorded Investment 90 days and Accruing 19,580 21,765
Acquired Loans | Residential Mortgage Loans | Residential Mortgage | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 101 73
Acquired Loans | Residential Mortgage Loans | Residential Mortgage | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,304 1,806
Acquired Loans | Residential Mortgage Loans | Residential Mortgage | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 20,316 22,873
Acquired Loans | Consumer - Other | Consumer - Home Equity    
Accounts, Notes, Loans and Financing Receivable    
Total past due 14,462 16,381
Current 446,532 503,635
Discount/Premium (26,295) (29,492)
Total Acquired Loans, Net of Unearned Income 434,699 490,524
Recorded Investment 90 days and Accruing 9,707 11,234
Acquired Loans | Consumer - Other | Consumer - Home Equity | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,408 2,859
Acquired Loans | Consumer - Other | Consumer - Home Equity | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 368 997
Acquired Loans | Consumer - Other | Consumer - Home Equity | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 11,686 12,525
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2 12
Current 23 72
Discount/Premium (1) 0
Total Acquired Loans, Net of Unearned Income 24 84
Recorded Investment 90 days and Accruing 2 12
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2 12
Acquired Loans | Consumer - Other | Consumer - Credit Card    
Accounts, Notes, Loans and Financing Receivable    
Total past due 20 17
Current 488 565
Discount/Premium 0 0
Total Acquired Loans, Net of Unearned Income 508 582
Recorded Investment 90 days and Accruing 20 17
Acquired Loans | Consumer - Other | Consumer - Credit Card | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Consumer - Other | Consumer - Credit Card | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Consumer - Other | Consumer - Credit Card | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 20 17
Acquired Loans | Consumer - Other | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,286 1,458
Current 62,507 79,167
Discount/Premium (728) (1,717)
Total Acquired Loans, Net of Unearned Income 63,065 78,908
Recorded Investment 90 days and Accruing 466 461
Acquired Loans | Consumer - Other | Consumer - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 428 580
Acquired Loans | Consumer - Other | Consumer - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 142 211
Acquired Loans | Consumer - Other | Consumer - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due $ 716 $ 667