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Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Loans - Ending balance: |  |  |  |
Loans, including unearned loan fees | $ 4,097,050 | $ 3,158,161 |  |
Non-Covered Loans |  |  |  |
Balance December 31, 2017 |  |  |  |
Individually evaluated for impairment | 2,579 | 3,064 |  |
Collectively evaluated for impairment | 35,587 | 34,501 |  |
Total | 38,166 | 37,565 | $ 33,441 | $ 30,185
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 17,175 | 16,772 |  |
Collectively evaluated for impairment | 4,005,721 | 3,101,620 |  |
Loans, including unearned loan fees | 4,022,896 | 3,118,392 |  |
Total | 4,024,221 | 3,119,154 |  |
Non-Covered Loans | Commercial and industrial |  |  |  |
Balance December 31, 2017 |  |  |  |
Individually evaluated for impairment | 2,508 | 2,909 |  |
Collectively evaluated for impairment | 23,898 | 24,087 |  |
Total | 26,406 | 26,996 | 22,056 | 16,983
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 12,665 | 12,523 |  |
Collectively evaluated for impairment | 1,906,055 | 1,620,191 |  |
Total | 1,918,720 | 1,632,714 |  |
Non-Covered Loans | CRE - investor owned |  |  |  |
Balance December 31, 2017 |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 3,890 | 3,420 |  |
Total | 3,890 | 3,420 | 3,484 | 4,382
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 422 | 430 |  |
Collectively evaluated for impairment | 768,853 | 544,378 |  |
Total | 769,275 | 544,808 |  |
Non-Covered Loans | CRE - owner occupied |  |  |  |
Balance December 31, 2017 |  |  |  |
Individually evaluated for impairment | 71 | 0 |  |
Collectively evaluated for impairment | 3,237 | 2,890 |  |
Total | 3,308 | 2,890 | 2,969 | 3,135
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 1,975 | 1,854 |  |
Collectively evaluated for impairment | 552,614 | 348,294 |  |
Total | 554,589 | 350,148 |  |
Non-Covered Loans | Construction and land development |  |  |  |
Balance December 31, 2017 |  |  |  |
Individually evaluated for impairment | 0 | 155 |  |
Collectively evaluated for impairment | 1,487 | 1,149 |  |
Total | 1,487 | 1,304 | 1,704 | 1,715
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 136 | 1,903 |  |
Collectively evaluated for impairment | 302,955 | 192,639 |  |
Total | 303,091 | 194,542 |  |
Non-Covered Loans | Residential real estate |  |  |  |
Balance December 31, 2017 |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 2,237 | 2,023 |  |
Total | 2,237 | 2,023 | 1,796 | 2,830
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 1,602 | 62 |  |
Collectively evaluated for impairment | 339,710 | 240,698 |  |
Total | 341,312 | 240,760 |  |
Non-Covered Loans | Consumer and other |  |  |  |
Balance December 31, 2017 |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 838 | 932 |  |
Total | 838 | 932 | $ 1,432 | $ 1,140
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 375 | 0 |  |
Collectively evaluated for impairment | 135,534 | 155,420 |  |
Loans, including unearned loan fees | 135,909 | 155,420 |  |
Total | $ 137,234 | $ 156,182 |  |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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