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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 18,174,906,000 $ 17,707,549,000
Nonaccrual loans [1] 85,564,000 77,248,000
Currently performing impaired loans 47,400,000 52,500,000
Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 13,122,000 14,743,000
Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 10,580,000 10,586,000
Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 40,434,000 59,859,000
30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 38,452,000 58,301,000
90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,982,000 1,558,000
Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 18,025,206,000 17,545,113,000
Commercial Real Estate [Member] | Owner-occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   2,653,433,000
Nonaccrual loans [1]   16,025,000
Commercial Real Estate [Member] | Owner-occupied | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   2,664,000
Commercial Real Estate [Member] | Owner-occupied | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans   874,000
Commercial Real Estate [Member] | Owner-occupied | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   10,170,000
Commercial Real Estate [Member] | Owner-occupied | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   10,170,000
Commercial Real Estate [Member] | Owner-occupied | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   0
Commercial Real Estate [Member] | Owner-occupied | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   2,623,700,000
Commercial Real Estate [Member] | All other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   4,511,521,000
Nonaccrual loans [1]   12,634,000
Commercial Real Estate [Member] | All other | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   5,659,000
Commercial Real Estate [Member] | All other | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans   2,802,000
Commercial Real Estate [Member] | All other | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   1,586,000
Commercial Real Estate [Member] | All other | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   1,586,000
Commercial Real Estate [Member] | All other | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   0
Commercial Real Estate [Member] | All other | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   4,488,840,000
Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   2,844,447,000
Nonaccrual loans [1]   22,564,000
Residential Mortgage [Member] | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   3,689,000
Residential Mortgage [Member] | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans   5,505,000
Residential Mortgage [Member] | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   18,059,000
Residential Mortgage [Member] | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   18,059,000
Residential Mortgage [Member] | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   0
Residential Mortgage [Member] | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans   2,794,630,000
Commercial real estate - mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 7,419,146,000 7,164,954,000
Commercial real estate - mortgage | Owner-occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,617,541,000  
Nonaccrual loans [1] 22,436,000  
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,577,000  
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 1,117,000  
Commercial real estate - mortgage | Owner-occupied | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,302,000  
Commercial real estate - mortgage | Owner-occupied | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,302,000  
Commercial real estate - mortgage | Owner-occupied | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0  
Commercial real estate - mortgage | Owner-occupied | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,583,109,000  
Commercial real estate - mortgage | All other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,801,605,000  
Nonaccrual loans [1] 12,601,000  
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,119,000  
Commercial real estate - mortgage | All other | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 2,761,000  
Commercial real estate - mortgage | All other | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 6,569,000  
Commercial real estate - mortgage | All other | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 6,569,000  
Commercial real estate - mortgage | All other | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0  
Commercial real estate - mortgage | All other | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,774,555,000  
Consumer real estate - mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,887,628,000 2,844,447,000
Nonaccrual loans [1] 27,336,000  
Consumer real estate - mortgage | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,683,000  
Consumer real estate - mortgage | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 4,795,000  
Consumer real estate - mortgage | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,021,000  
Consumer real estate - mortgage | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 10,982,000  
Consumer real estate - mortgage | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 39,000  
Consumer real estate - mortgage | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,840,793,000  
Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,097,570,000 2,072,455,000
Nonaccrual loans [1] 868,000 2,020,000
Construction and land development | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,437,000 2,108,000
Construction and land development | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 1,907,000 1,367,000
Construction and land development | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 795,000 3,759,000
Construction and land development | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 795,000 3,759,000
Construction and land development | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 0
Construction and land development | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,092,563,000 2,063,201,000
Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,419,520,000 5,271,421,000
Nonaccrual loans [1] 21,993,000 23,022,000
Commercial and industrial | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 306,000 623,000
Commercial and industrial | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 0 38,000
Commercial and industrial | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 10,391,000 22,533,000
Commercial and industrial | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 9,068,000 21,451,000
Commercial and industrial | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,323,000 1,082,000
Commercial and industrial | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,386,830,000 5,225,205,000
Consumer and other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 351,042,000 354,272,000
Nonaccrual loans [1] 330,000 983,000
Consumer and other | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 0
Consumer and other | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 0 0
Consumer and other | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,356,000 3,752,000
Consumer and other | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,736,000 3,276,000
Consumer and other | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 620,000 476,000
Consumer and other | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 347,356,000 $ 349,537,000
[1] Approximately $47.4 million and $52.5 million of nonaccrual loans as of March 31, 2019 and December 31, 2018, respectively, were performing pursuant to their contractual terms at those dates.