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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Past Due [Line Items]    
Loans $ 18,814,318 $ 17,707,549
Nonaccrual loans [1] 68,904 77,248
Currently performing impaired loans 34,800 52,500
Purchased credit impaired, accruing    
Financing Receivable, Past Due [Line Items]    
Loans 12,632 14,743
Purchased credit impaired, nonaccruing    
Financing Receivable, Past Due [Line Items]    
Nonaccrual loans [1] 7,173 10,586
Past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 39,987 59,859
30-89 days past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 37,254 58,301
90 days or more past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 2,733 1,558
Current and Accruing    
Financing Receivable, Past Due [Line Items]    
Loans 18,685,622 17,545,113
Commercial real estate - mortgage    
Financing Receivable, Past Due [Line Items]    
Loans 7,585,393 7,164,954
Commercial real estate - mortgage | Owner-occupied    
Financing Receivable, Past Due [Line Items]    
Loans 2,624,160 2,653,433
Nonaccrual loans [1] 11,976 16,025
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing    
Financing Receivable, Past Due [Line Items]    
Loans 2,450 2,664
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, nonaccruing    
Financing Receivable, Past Due [Line Items]    
Nonaccrual loans [1] 970 874
Commercial real estate - mortgage | Owner-occupied | Past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 2,443 10,170
Commercial real estate - mortgage | Owner-occupied | 30-89 days past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 2,373 10,170
Commercial real estate - mortgage | Owner-occupied | 90 days or more past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 70 0
Commercial real estate - mortgage | Owner-occupied | Current and Accruing    
Financing Receivable, Past Due [Line Items]    
Loans 2,606,321 2,623,700
Commercial real estate - mortgage | All other    
Financing Receivable, Past Due [Line Items]    
Loans 4,961,233 4,511,521
Nonaccrual loans [1] 10,828 12,634
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing    
Financing Receivable, Past Due [Line Items]    
Loans 5,070 5,659
Commercial real estate - mortgage | All other | Purchased credit impaired, nonaccruing    
Financing Receivable, Past Due [Line Items]    
Nonaccrual loans [1] 17 2,802
Commercial real estate - mortgage | All other | Past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 4,731 1,586
Commercial real estate - mortgage | All other | 30-89 days past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 4,731 1,586
Commercial real estate - mortgage | All other | 90 days or more past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Commercial real estate - mortgage | All other | Current and Accruing    
Financing Receivable, Past Due [Line Items]    
Loans 4,940,587 4,488,840
Consumer real estate - mortgage    
Financing Receivable, Past Due [Line Items]    
Loans 2,949,755 2,844,447
Nonaccrual loans [1] 25,501 22,564
Consumer real estate - mortgage | Purchased credit impaired, accruing    
Financing Receivable, Past Due [Line Items]    
Loans 3,406 3,689
Consumer real estate - mortgage | Purchased credit impaired, nonaccruing    
Financing Receivable, Past Due [Line Items]    
Nonaccrual loans [1] 4,396 5,505
Consumer real estate - mortgage | Past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 10,823 18,059
Consumer real estate - mortgage | 30-89 days past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 10,603 18,059
Consumer real estate - mortgage | 90 days or more past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 220 0
Consumer real estate - mortgage | Current and Accruing    
Financing Receivable, Past Due [Line Items]    
Loans 2,905,629 2,794,630
Construction and land development    
Financing Receivable, Past Due [Line Items]    
Loans 2,117,969 2,072,455
Nonaccrual loans [1] 605 2,020
Construction and land development | Purchased credit impaired, accruing    
Financing Receivable, Past Due [Line Items]    
Loans 1,421 2,108
Construction and land development | Purchased credit impaired, nonaccruing    
Financing Receivable, Past Due [Line Items]    
Nonaccrual loans [1] 1,790 1,367
Construction and land development | Past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 3,469 3,759
Construction and land development | 30-89 days past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 3,469 3,759
Construction and land development | 90 days or more past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Construction and land development | Current and Accruing    
Financing Receivable, Past Due [Line Items]    
Loans 2,110,684 2,063,201
Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Loans 5,795,107 5,271,421
Nonaccrual loans [1] 19,883 23,022
Commercial and industrial | Purchased credit impaired, accruing    
Financing Receivable, Past Due [Line Items]    
Loans 285 623
Commercial and industrial | Purchased credit impaired, nonaccruing    
Financing Receivable, Past Due [Line Items]    
Nonaccrual loans [1] 0 38
Commercial and industrial | Past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 12,957 22,533
Commercial and industrial | 30-89 days past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 11,420 21,451
Commercial and industrial | 90 days or more past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 1,537 1,082
Commercial and industrial | Current and Accruing    
Financing Receivable, Past Due [Line Items]    
Loans 5,761,982 5,225,205
Consumer and other    
Financing Receivable, Past Due [Line Items]    
Loans 366,094 354,272
Nonaccrual loans [1] 111 983
Consumer and other | Purchased credit impaired, accruing    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Consumer and other | Purchased credit impaired, nonaccruing    
Financing Receivable, Past Due [Line Items]    
Nonaccrual loans [1] 0 0
Consumer and other | Past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 5,564 3,752
Consumer and other | 30-89 days past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 4,658 3,276
Consumer and other | 90 days or more past due and accruing    
Financing Receivable, Past Due [Line Items]    
Loans 906 476
Consumer and other | Current and Accruing    
Financing Receivable, Past Due [Line Items]    
Loans $ 360,419 $ 349,537
[1]
Approximately $34.8 million and $52.5 million of nonaccrual loans as of June 30, 2019 and December 31, 2018, respectively, were performing pursuant to their contractual terms at those dates.