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Loans - Summary of Portfolio Loans by Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, including unearned loan fees $ 4,030,658 $ 3,158,161
Portfolio loans, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 3,949,856 3,119,154
Unearned loan fees, net (1,180) (762)
Loans, including unearned loan fees 3,948,676 3,118,392
Portfolio loans, net | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 1,861,285 1,632,714
Portfolio loans, net | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 737,986 544,808
Portfolio loans, net | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 553,512 350,148
Portfolio loans, net | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 302,182 194,542
Portfolio loans, net | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 339,377 240,760
Portfolio loans, net | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 1,933,057 1,330,258
Portfolio loans, net | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 155,514 156,182
Loans, including unearned loan fees 154,334 155,420
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 81,982 39,769
Loans, before unearned loan fees 81,982 39,769
Covered Loans [Member] | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 3,676 3,523
Loans, before unearned loan fees 3,676 3,523
Covered Loans [Member] | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 45,865 8,162
Loans, before unearned loan fees 45,865 8,162
Covered Loans [Member] | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 11,786 11,863
Loans, before unearned loan fees 11,786 11,863
Covered Loans [Member] | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 7,927 4,365
Loans, before unearned loan fees 7,927 4,365
Covered Loans [Member] | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 12,661 11,792
Loans, before unearned loan fees 12,661 11,792
Covered Loans [Member] | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 78,239 36,182
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 67 64
Loans, before unearned loan fees $ 67 $ 64