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Loans - Summary of Portfolio Loans by Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses $ 43,095 $ 43,476
Loans, including unearned loan fees 5,017,077 4,350,001
Portfolio loans, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 41,945 42,295
Loans, before unearned loan fees 4,896,486 4,305,626
Unearned loan fees, net (1,912) (2,026)
Loans, including unearned loan fees 4,894,574 4,303,600
Portfolio loans, net | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 28,660 29,039
Loans, before unearned loan fees 2,209,437 2,121,008
Portfolio loans, net | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 5,339 4,683
Loans, before unearned loan fees 1,144,868 843,728
Portfolio loans, net | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 3,774 4,239
Loans, before unearned loan fees 647,198 604,498
Portfolio loans, net | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 1,699 1,987
Loans, before unearned loan fees 358,884 330,097
Portfolio loans, net | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 1,625 1,616
Loans, before unearned loan fees 416,731 298,944
Portfolio loans, net | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, before unearned loan fees 2,567,681 2,077,267
Portfolio loans, net | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 848 731
Loans, before unearned loan fees 119,368 107,351
Loans, including unearned loan fees 117,456 105,325
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Allowance for Credit Losses 1,150  
Loans and Leases Receivable, Gross, Carrying Amount, Covered 122,503 46,401
Loans, before unearned loan fees 122,503 46,401
Covered Loans [Member] | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 17,613 2,159
Loans, before unearned loan fees 17,613 2,159
Covered Loans [Member] | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 42,948 23,939
Loans, before unearned loan fees 42,948 23,939
Covered Loans [Member] | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 35,026 9,669
Loans, before unearned loan fees 35,026 9,669
Covered Loans [Member] | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 10,481 4,548
Loans, before unearned loan fees 10,481 4,548
Covered Loans [Member] | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 16,171 6,082
Loans, before unearned loan fees 16,171 6,082
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 264 4
Loans, before unearned loan fees $ 264 $ 4