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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Total |  |  |  |  |  |  |
Loans - Ending balance: |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 4,267,430 |  | $ 4,267,430 |  |  |  | $ 4,097,050
Portfolio loans, net |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 0 | 1 | 1 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 187 | $ 0 | $ 187 | $ 676 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 187 | $ 0 | 187 | $ 676 |  |  |
Individually evaluated for impairment | 4,314 |  | 4,314 |  |  |  | 2,579
Collectively evaluated for impairment | 37,578 |  | 37,578 |  |  |  | 35,587
Total | 41,892 |  | 41,892 |  | $ 42,007 | $ 40,263 | 38,166
Loans - Ending balance: |  |  |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (1,348) |  | (1,348) |  |  |  | (1,325)
Individually evaluated for impairment | 18,411 |  | 18,411 |  |  |  | 17,175
Collectively evaluated for impairment | 4,199,930 |  | 4,199,930 |  |  |  | 4,005,721
Total | 4,219,689 |  | 4,219,689 |  |  |  | 4,024,221
Loans and Leases Receivable, Gross | $ 4,218,341 |  | $ 4,218,341 |  |  |  | 4,022,896
Portfolio loans, net | Commercial and industrial |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 0 | 1 |  |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 187 | $ 0 |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 187 | $ 0 |  |  |  |  |
Individually evaluated for impairment | 4,128 |  | $ 4,128 |  |  |  | 2,508
Collectively evaluated for impairment | 25,462 |  | 25,462 |  |  |  | 23,898
Total | 29,590 |  | 29,590 |  | 29,424 | 27,410 | 26,406
Loans - Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment | 12,197 |  | 12,197 |  |  |  | 12,665
Collectively evaluated for impairment | 2,020,732 |  | 2,020,732 |  |  |  | 1,906,055
Total | 2,032,929 |  | 2,032,929 |  |  |  | 1,918,720
Portfolio loans, net | CRE - investor owned |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |  | 0
Collectively evaluated for impairment | 4,572 |  | 4,572 |  |  |  | 3,890
Total | 4,572 |  | 4,572 |  | 4,561 | 4,546 | 3,890
Loans - Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment | 770 |  | 770 |  |  |  | 422
Collectively evaluated for impairment | 825,677 |  | 825,677 |  |  |  | 768,853
Total | 826,447 |  | 826,447 |  |  |  | 769,275
Portfolio loans, net | CRE - owner occupied |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | 177 |  | 177 |  |  |  | 71
Collectively evaluated for impairment | 3,453 |  | 3,453 |  |  |  | 3,237
Total | 3,630 |  | 3,630 |  | 3,845 | 3,502 | 3,308
Loans - Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment | 2,655 |  | 2,655 |  |  |  | 1,975
Collectively evaluated for impairment | 586,390 |  | 586,390 |  |  |  | 552,614
Total | 589,045 |  | 589,045 |  |  |  | 554,589
Portfolio loans, net | Construction and land development |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |  | 0
Collectively evaluated for impairment | 1,865 |  | 1,865 |  |  |  | 1,487
Total | 1,865 |  | 1,865 |  | 1,690 | 1,728 | 1,487
Loans - Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |  | 136
Collectively evaluated for impairment | 326,858 |  | 326,858 |  |  |  | 302,955
Total | 326,858 |  | 326,858 |  |  |  | 303,091
Portfolio loans, net | Residential real estate |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | 9 |  | 9 |  |  |  | 0
Collectively evaluated for impairment | 1,533 |  | 1,533 |  |  |  | 2,237
Total | 1,542 |  | 1,542 |  | 1,763 | 2,315 | 2,237
Loans - Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment | 2,477 |  | 2,477 |  |  |  | 1,602
Collectively evaluated for impairment | 305,908 |  | 305,908 |  |  |  | 339,710
Total | 308,385 |  | 308,385 |  |  |  | 341,312
Portfolio loans, net | Consumer and other |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |  | 0
Collectively evaluated for impairment | 693 |  | 693 |  |  |  | 838
Total | 693 |  | 693 |  | $ 724 | $ 762 | 838
Loans - Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment | 312 |  | 312 |  |  |  | 375
Collectively evaluated for impairment | 134,365 |  | 134,365 |  |  |  | 135,534
Total | 136,025 |  | 136,025 |  |  |  | 137,234
Loans and Leases Receivable, Gross | $ 134,677 |  | $ 134,677 |  |  |  | $ 135,909

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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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- 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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