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Loans - Commercial Loans by Risk Rating Categories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 14,218,747 $ 14,155,267
Originated    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 10,012,516 9,747,429
Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,486,533 2,407,606
Originated | Total commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,918,803 2,751,425
Originated | Real estate construction and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 485,474 498,155
Acquired    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,206,231 4,407,838
Commercial loan portfolio    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 8,575,441 8,460,527
Commercial loan portfolio | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 8,112,785 8,038,463
Commercial loan portfolio | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 237,838 204,706
Commercial loan portfolio | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 223,935 216,353
Commercial loan portfolio | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 883 1,005
Commercial loan portfolio | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,427,285 3,385,642
Commercial loan portfolio | Total commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,588,376 4,500,670
Commercial loan portfolio | Real estate construction and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 559,780 574,215
Commercial loan portfolio | Originated    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 5,890,810 5,657,186
Commercial loan portfolio | Originated | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 5,687,538 5,488,571
Commercial loan portfolio | Originated | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 97,606 66,100
Commercial loan portfolio | Originated | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 105,354 102,515
Commercial loan portfolio | Originated | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 312 0
Commercial loan portfolio | Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,486,533 2,407,606
Commercial loan portfolio | Originated | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,401,859 2,316,464
Commercial loan portfolio | Originated | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 37,084 41,059
Commercial loan portfolio | Originated | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 47,590 50,083
Commercial loan portfolio | Originated | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Commercial loan portfolio | Originated | Total commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,918,803 2,751,425
Commercial loan portfolio | Originated | Total commercial real estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,813,339 2,677,579
Commercial loan portfolio | Originated | Total commercial real estate | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 50,798 24,204
Commercial loan portfolio | Originated | Total commercial real estate | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 54,354 49,642
Commercial loan portfolio | Originated | Total commercial real estate | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 312 0
Commercial loan portfolio | Originated | Real estate construction and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 485,474 498,155
Commercial loan portfolio | Originated | Real estate construction and land development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 472,340 494,528
Commercial loan portfolio | Originated | Real estate construction and land development | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 9,724 837
Commercial loan portfolio | Originated | Real estate construction and land development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,410 2,790
Commercial loan portfolio | Originated | Real estate construction and land development | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Commercial loan portfolio | Acquired    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,684,631 2,803,341
Commercial loan portfolio | Acquired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,425,247 2,549,892
Commercial loan portfolio | Acquired | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 140,232 138,606
Commercial loan portfolio | Acquired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 118,581 113,838
Commercial loan portfolio | Acquired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 571 1,005
Commercial loan portfolio | Acquired | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 940,752 978,036
Commercial loan portfolio | Acquired | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 830,615 873,861
Commercial loan portfolio | Acquired | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 66,480 68,418
Commercial loan portfolio | Acquired | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 43,471 35,539
Commercial loan portfolio | Acquired | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 186 218
Commercial loan portfolio | Acquired | Total commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,669,573 1,749,245
Commercial loan portfolio | Acquired | Total commercial real estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,522,896 1,603,685
Commercial loan portfolio | Acquired | Total commercial real estate | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 72,141 67,970
Commercial loan portfolio | Acquired | Total commercial real estate | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 74,151 76,803
Commercial loan portfolio | Acquired | Total commercial real estate | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 385 787
Commercial loan portfolio | Acquired | Real estate construction and land development    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 74,306 76,060
Commercial loan portfolio | Acquired | Real estate construction and land development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 71,736 72,346
Commercial loan portfolio | Acquired | Real estate construction and land development | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,611 2,218
Commercial loan portfolio | Acquired | Real estate construction and land development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 959 1,496
Commercial loan portfolio | Acquired | Real estate construction and land development | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Owner-occupied | Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,185,797 1,185,614
Owner-occupied | Commercial loan portfolio | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,832,824 1,813,562
Owner-occupied | Commercial loan portfolio | Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,185,797 1,185,614
Owner-occupied | Commercial loan portfolio | Originated | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,123,847 1,133,609
Owner-occupied | Commercial loan portfolio | Originated | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 16,850 19,438
Owner-occupied | Commercial loan portfolio | Originated | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 44,789 32,567
Owner-occupied | Commercial loan portfolio | Originated | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 311 0
Owner-occupied | Commercial loan portfolio | Acquired | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 647,027 627,948
Owner-occupied | Commercial loan portfolio | Acquired | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 583,937 580,127
Owner-occupied | Commercial loan portfolio | Acquired | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 26,683 23,998
Owner-occupied | Commercial loan portfolio | Acquired | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 36,022 23,036
Owner-occupied | Commercial loan portfolio | Acquired | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 385 787
Non-owner occupied | Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,689,022 1,518,787
Non-owner occupied | Commercial loan portfolio | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,680,801 2,606,761
Non-owner occupied | Commercial loan portfolio | Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,689,022 1,518,787
Non-owner occupied | Commercial loan portfolio | Originated | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,652,313 1,504,195
Non-owner occupied | Commercial loan portfolio | Originated | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 33,895 4,728
Non-owner occupied | Commercial loan portfolio | Originated | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,813 9,864
Non-owner occupied | Commercial loan portfolio | Originated | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1 0
Non-owner occupied | Commercial loan portfolio | Acquired | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 991,779 1,087,974
Non-owner occupied | Commercial loan portfolio | Acquired | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 913,327 995,709
Non-owner occupied | Commercial loan portfolio | Acquired | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 45,146 43,645
Non-owner occupied | Commercial loan portfolio | Acquired | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 33,306 48,620
Non-owner occupied | Commercial loan portfolio | Acquired | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Vacant land | Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 43,984 47,024
Vacant land | Commercial loan portfolio | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 74,751 80,347
Vacant land | Commercial loan portfolio | Originated | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 43,984 47,024
Vacant land | Commercial loan portfolio | Originated | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 37,179 39,775
Vacant land | Commercial loan portfolio | Originated | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 53 38
Vacant land | Commercial loan portfolio | Originated | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 6,752 7,211
Vacant land | Commercial loan portfolio | Originated | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Vacant land | Commercial loan portfolio | Acquired | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 30,767 33,323
Vacant land | Commercial loan portfolio | Acquired | Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 25,632 27,849
Vacant land | Commercial loan portfolio | Acquired | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 312 327
Vacant land | Commercial loan portfolio | Acquired | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,823 5,147
Vacant land | Commercial loan portfolio | Acquired | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 0 $ 0