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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) loan | Sep. 30, 2016 USD ($) loan | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Loans - Ending balance: |  |  |  |  |
Loans and Leases Receivable, Gross | $ 4,030,658 |  |  |  | $ 3,158,161
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 | 4 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 676 | $ 2,609 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 676 | 2,609 |  |  |
Individually evaluated for impairment | 2,417 |  |  |  | 3,064
Collectively evaluated for impairment | 35,875 |  |  |  | 34,501
Total | 38,292 | $ 38,292 | $ 36,673 | $ 39,148 | 37,565
Loans - Ending balance: |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (1,180) |  |  |  | (762)
Individually evaluated for impairment | 10,693 |  |  |  | 16,772
Collectively evaluated for impairment | 3,937,983 |  |  |  | 3,101,620
Total | 3,949,856 |  |  |  | 3,119,154
Loans and Leases Receivable, Gross | $ 3,948,676 |  |  |  | 3,118,392
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 | 2 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 676 | $ 2,341 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 676 | 2,341 |  |  |
Individually evaluated for impairment | 2,063 |  |  |  | 2,909
Collectively evaluated for impairment | 24,410 |  |  |  | 24,087
Total | 26,473 | $ 26,473 | 25,755 | 28,778 | 26,996
Loans - Ending balance: |  |  |  |  |
Individually evaluated for impairment | 7,646 |  |  |  | 12,523
Collectively evaluated for impairment | 1,853,639 |  |  |  | 1,620,191
Total | $ 1,861,285 |  |  |  | 1,632,714
Portfolio loans, net | Commercial Real Estate Investor Owned |  |  |  |  |
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 | 0 | 1 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 248 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 0 | 248 |  |  |
Individually evaluated for impairment | 120 |  |  |  | 0
Collectively evaluated for impairment | 3,655 |  |  |  | 3,420
Total | 3,775 | $ 3,775 | 3,387 | 3,324 | 3,420
Loans - Ending balance: |  |  |  |  |
Individually evaluated for impairment | 544 |  |  |  | 430
Collectively evaluated for impairment | 737,442 |  |  |  | 544,378
Total | $ 737,986 |  |  |  | 544,808
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] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan | 0 | 0 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 0 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 0 | 0 |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0
Collectively evaluated for impairment | 3,246 |  |  |  | 2,890
Total | 3,246 | $ 3,246 | 3,040 | 2,730 | 2,890
Loans - Ending balance: |  |  |  |  |
Individually evaluated for impairment | 1,513 |  |  |  | 1,854
Collectively evaluated for impairment | 551,999 |  |  |  | 348,294
Total | $ 553,512 |  |  |  | 350,148
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] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan | 0 | 1 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 20 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 0 | 20 |  |  |
Individually evaluated for impairment | 186 |  |  |  | 155
Collectively evaluated for impairment | 1,439 |  |  |  | 1,149
Total | 1,625 | 1,625 | 1,295 | 1,302 | 1,304
Loans - Ending balance: |  |  |  |  |
Individually evaluated for impairment | 323 |  |  |  | 1,903
Collectively evaluated for impairment | 301,859 |  |  |  | 192,639
Total | 302,182 |  |  |  | 194,542
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 | 48 |  |  |  | 0
Collectively evaluated for impairment | 2,204 |  |  |  | 2,023
Total | 2,252 | $ 2,252 | 2,284 | 2,036 | 2,023
Loans - Ending balance: |  |  |  |  |
Individually evaluated for impairment | 667 |  |  |  | 62
Collectively evaluated for impairment | 338,710 |  |  |  | 240,698
Total | $ 339,377 |  |  |  | 240,760
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] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan | 0 | 0 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 0 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 0 | 0 |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0
Collectively evaluated for impairment | 921 |  |  |  | 932
Total | 921 | $ 921 | $ 912 | $ 978 | 932
Loans - Ending balance: |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0
Collectively evaluated for impairment | 154,334 |  |  |  | 155,420
Total | 155,514 |  |  |  | 156,182
Loans and Leases Receivable, Gross | $ 154,334 |  |  |  | $ 155,420
Portfolio loans, net | Residential Portfolio Segment [Member] |  |  |  |  |
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 | 0 | 0 |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 0 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 0 | $ 0 |  |  |

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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 of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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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