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Loans - Summary of Portfolio Loans by Category (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, including unearned loan fees $ 3,894,770 $ 3,158,161
Portfolio loans, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 3,811,345 3,119,154
Unearned loan fees, net (875) (762)
Loans, including unearned loan fees 3,810,470 3,118,392
Portfolio loans, net | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 1,795,667 1,632,714
Portfolio loans, net | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 711,702 544,808
Portfolio loans, net | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 523,185 350,148
Portfolio loans, net | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 283,226 194,542
Portfolio loans, net | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 345,895 240,760
Portfolio loans, net | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 1,864,008 1,330,258
Portfolio loans, net | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 151,670 156,182
Loans, including unearned loan fees 150,795 155,420
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 84,300 39,769
Loans, before unearned loan fees 84,300 39,769
Covered Loans [Member] | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 4,059 3,523
Loans, before unearned loan fees 4,059 3,523
Covered Loans [Member] | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 46,180 8,162
Loans, before unearned loan fees 46,180 8,162
Covered Loans [Member] | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 12,743 11,863
Loans, before unearned loan fees 12,743 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 7,883 4,365
Loans, before unearned loan fees 7,883 4,365
Covered Loans [Member] | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 13,370 11,792
Loans, before unearned loan fees 13,370 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 80,176 36,182
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 65 64
Loans, before unearned loan fees $ 65 $ 64