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Loans - Summary of Portfolio Loans by Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, including unearned loan fees $ 4,267,430 $ 4,097,050
Portfolio loans, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 4,219,689 4,024,221
Unearned loan fees, net (1,348) (1,325)
Loans, including unearned loan fees 4,218,341 4,022,896
Portfolio loans, net | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 2,032,929 1,918,720
Portfolio loans, net | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 826,447 769,275
Portfolio loans, net | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 589,045 554,589
Portfolio loans, net | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 326,858 303,091
Portfolio loans, net | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 308,385 341,312
Portfolio loans, net | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 2,050,735 1,968,267
Portfolio loans, net | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 136,025 137,234
Loans, including unearned loan fees 134,677 135,909
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 49,089 74,154
Loans, before unearned loan fees 49,089 74,154
Covered Loans [Member] | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 2,923 3,212
Loans, before unearned loan fees 2,923 3,212
Covered Loans [Member] | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 25,172 42,887
Loans, before unearned loan fees 25,172 42,887
Covered Loans [Member] | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 9,520 11,332
Loans, before unearned loan fees 9,520 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 5,168 5,883
Loans, before unearned loan fees 5,168 5,883
Covered Loans [Member] | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 6,291 10,781
Loans, before unearned loan fees 6,291 10,781
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 15 59
Loans, before unearned loan fees $ 15 $ 59