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Loans - Summary of Portfolio Loans by Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, including unearned loan fees $ 4,190,845 $ 4,097,050
Portfolio loans, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 4,125,153 4,024,221
Unearned loan fees, net (914) (1,325)
Loans, including unearned loan fees 4,124,239 4,022,896
Portfolio loans, net | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 1,981,684 1,918,720
Portfolio loans, net | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 811,244 769,275
Portfolio loans, net | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 568,773 554,589
Portfolio loans, net | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 306,824 303,091
Portfolio loans, net | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 328,192 341,312
Portfolio loans, net | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 2,015,033 1,968,267
Portfolio loans, net | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 128,436 137,234
Loans, including unearned loan fees 127,522 135,909
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 66,606 74,154
Loans, before unearned loan fees 66,606 74,154
Covered Loans [Member] | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 2,966 3,212
Loans, before unearned loan fees 2,966 3,212
Covered Loans [Member] | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 37,137 42,887
Loans, before unearned loan fees 37,137 42,887
Covered Loans [Member] | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 10,886 11,332
Loans, before unearned loan fees 10,886 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 5,553 5,883
Loans, before unearned loan fees 5,553 5,883
Covered Loans [Member] | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 10,008 10,781
Loans, before unearned loan fees 10,008 10,781
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 56 59
Loans, before unearned loan fees $ 56 $ 59