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Loans - Summary of Portfolio Loans by Category (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, including unearned loan fees $ 4,275,761 $ 4,097,050
Portfolio loans, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 4,216,081 4,024,221
Unearned loan fees, net (1,085) (1,325)
Loans, including unearned loan fees 4,214,996 4,022,896
Portfolio loans, net | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 2,038,040 1,918,720
Portfolio loans, net | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 819,427 769,275
Portfolio loans, net | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 593,138 554,589
Portfolio loans, net | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 300,117 303,091
Portfolio loans, net | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 318,055 341,312
Portfolio loans, net | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 2,030,737 1,968,267
Portfolio loans, net | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 147,304 137,234
Loans, including unearned loan fees 146,219 135,909
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 60,765 74,154
Loans, before unearned loan fees 60,765 74,154
Covered Loans [Member] | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 2,711 3,212
Loans, before unearned loan fees 2,711 3,212
Covered Loans [Member] | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 30,539 42,887
Loans, before unearned loan fees 30,539 42,887
Covered Loans [Member] | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 13,269 11,332
Loans, before unearned loan fees 13,269 11,332
Covered Loans [Member] | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 5,121 5,883
Loans, before unearned loan fees 5,121 5,883
Covered Loans [Member] | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 9,102 10,781
Loans, before unearned loan fees 9,102 10,781
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 23 59
Loans, before unearned loan fees $ 23 $ 59