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Loans - Aging Status of Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule representing the aging status of the recorded investment in loans by classes    
Total loans $ 15,324,048 $ 15,269,779
Originated Portfolio    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 41,613 35,381
Nonaccrual Loans 89,324 85,433
Current 12,011,337 11,723,942
Total loans 12,142,274 11,844,756
Originated Portfolio | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 41,069 33,954
Originated Portfolio | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 544 1,427
Originated Portfolio | Commercial    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 24,244 16,835
Nonaccrual Loans 33,715 30,139
Current 3,370,473 3,240,113
Total loans 3,428,432 3,287,087
Originated Portfolio | Commercial | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 23,700 16,835
Originated Portfolio | Commercial | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 544 0
Originated Portfolio | Total commercial real estate    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 7,543 7,549
Nonaccrual Loans 39,817 42,414
Current 3,487,913 3,470,194
Total loans 3,535,273 3,520,157
Originated Portfolio | Total commercial real estate | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 7,543 6,610
Originated Portfolio | Total commercial real estate | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 0 939
Originated Portfolio | Real estate construction and land development    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 1,528 247
Nonaccrual Loans 3,663 12
Current 587,098 566,467
Total loans 592,289 566,726
Originated Portfolio | Real estate construction and land development | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 1,528 247
Originated Portfolio | Real estate construction and land development | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 0 0
Originated Portfolio | Residential mortgage    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 2,247 1,688
Nonaccrual Loans 7,665 7,988
Current 2,533,031 2,397,629
Total loans 2,542,943 2,407,305
Originated Portfolio | Residential mortgage | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 2,247 1,688
Originated Portfolio | Residential mortgage | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 0 0
Originated Portfolio | Consumer installment    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 3,556 4,731
Nonaccrual Loans 1,191 1,276
Current 1,435,446 1,445,345
Total loans 1,440,193 1,451,352
Originated Portfolio | Consumer installment | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 3,556 4,731
Originated Portfolio | Consumer installment | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 0 0
Originated Portfolio | Home equity    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 2,495 4,331
Nonaccrual Loans 3,273 3,604
Current 597,376 604,194
Total loans 603,144 612,129
Originated Portfolio | Home equity | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 2,495 3,843
Originated Portfolio | Home equity | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 0 488
Owner-occupied | Originated Portfolio | Commercial    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 4,642 4,709
Nonaccrual Loans 18,234 16,056
Current 1,514,080 1,492,767
Total loans 1,536,956 1,513,532
Owner-occupied | Originated Portfolio | Commercial | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 4,642 4,657
Owner-occupied | Originated Portfolio | Commercial | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 0 52
Non-owner occupied | Originated Portfolio | Commercial    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 1,975 2,680
Nonaccrual Loans 19,430 23,021
Current 1,940,458 1,940,629
Total loans 1,961,863 1,966,330
Non-owner occupied | Originated Portfolio | Commercial | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 1,975 1,793
Non-owner occupied | Originated Portfolio | Commercial | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 0 887
Vacant land | Originated Portfolio | Commercial    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 926 160
Nonaccrual Loans 2,153 3,337
Current 33,375 36,798
Total loans 36,454 40,295
Vacant land | Originated Portfolio | Commercial | 30-89 days past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing 926 160
Vacant land | Originated Portfolio | Commercial | 90 days or more past due    
Schedule representing the aging status of the recorded investment in loans by classes    
Loans Past Due and Still Accruing $ 0 $ 0