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Loans - Summary of Portfolio Loans by Category (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, including unearned loan fees | $ 4,030,658 | $ 3,158,161
Portfolio loans, net |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 3,949,856 | 3,119,154
Unearned loan fees, net | (1,180) | (762)
Loans, including unearned loan fees | 3,948,676 | 3,118,392
Portfolio loans, net | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 1,861,285 | 1,632,714
Portfolio loans, net | Commercial - investor owned |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 737,986 | 544,808
Portfolio loans, net | Commercial - owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 553,512 | 350,148
Portfolio loans, net | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 302,182 | 194,542
Portfolio loans, net | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 339,377 | 240,760
Portfolio loans, net | Total real estate loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 1,933,057 | 1,330,258
Portfolio loans, net | Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 155,514 | 156,182
Loans, including unearned loan fees | 154,334 | 155,420
Covered Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 81,982 | 39,769
Loans, before unearned loan fees | 81,982 | 39,769
Covered Loans [Member] | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 3,676 | 3,523
Loans, before unearned loan fees | 3,676 | 3,523
Covered Loans [Member] | Commercial - investor owned |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 45,865 | 8,162
Loans, before unearned loan fees | 45,865 | 8,162
Covered Loans [Member] | Commercial - owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 11,786 | 11,863
Loans, before unearned loan fees | 11,786 | 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 | 7,927 | 4,365
Loans, before unearned loan fees | 7,927 | 4,365
Covered Loans [Member] | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 12,661 | 11,792
Loans, before unearned loan fees | 12,661 | 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 | 78,239 | 36,182
Covered Loans [Member] | Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 67 | 64
Loans, before unearned loan fees | $ 67 | $ 64

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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