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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

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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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