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Loans - Summary of Portfolio Loans by Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans, including unearned loan fees $ 3,891,064 $ 3,158,161
Portfolio loans, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 3,803,656 3,119,154
Unearned loan fees, net (975) (762)
Portfolio loans, including unearned loan fees 3,802,681 3,118,392
Portfolio loans, net | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 1,773,105 1,632,714
Portfolio loans, net | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 726,413 544,808
Portfolio loans, net | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 480,281 350,148
Portfolio loans, net | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 288,342 194,542
Portfolio loans, net | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 356,415 240,760
Portfolio loans, net | Total real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 1,851,451 1,330,258
Portfolio loans, net | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio loans 179,100 156,182
Portfolio loans, including unearned loan fees 178,125 155,420
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 88,383 39,769
Portfolio loans 88,383 39,769
Covered Loans [Member] | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 4,335 3,523
Portfolio loans 4,335 3,523
Covered Loans [Member] | Commercial - investor owned    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 42,532 8,162
Portfolio loans 42,532 8,162
Covered Loans [Member] | Commercial - owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 13,580 11,863
Portfolio loans 13,580 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 12,914 4,365
Portfolio loans 12,914 4,365
Covered Loans [Member] | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 14,943 11,792
Portfolio loans 14,943 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 83,969 36,182
Covered Loans [Member] | Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 79 64
Portfolio loans $ 79 $ 64