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Purchased Credit Impaired ("PCI") Loans - Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category (Details) - Covered Loans - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | $ 7,036 | $ 328
90 or More Days Past Due | 1,980 | 3,962
Total Past Due | 9,016 | 4,290
Current | 40,073 | 69,864
Total | 49,089 | 74,154
Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 0 | 0
90 or More Days Past Due | 0 | 0
Total Past Due | 0 | 0
Current | 2,923 | 3,212
Total | 2,923 | 3,212
CRE - investor owned |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 627 | 0
90 or More Days Past Due | 1,190 | 3,034
Total Past Due | 1,817 | 3,034
Current | 23,355 | 39,853
Total | 25,172 | 42,887
CRE - owner occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 6,230 | 0
90 or More Days Past Due | 744 | 673
Total Past Due | 6,974 | 673
Current | 2,546 | 10,659
Total | 9,520 | 11,332
Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 146 | 0
90 or More Days Past Due | 0 | 0
Total Past Due | 146 | 0
Current | 5,022 | 5,883
Total | 5,168 | 5,883
Residential real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 33 | 328
90 or More Days Past Due | 46 | 255
Total Past Due | 79 | 583
Current | 6,212 | 10,198
Total | 6,291 | 10,781
Consumer and other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 0 | 0
90 or More Days Past Due | 0 | 0
Total Past Due | 0 | 0
Current | 15 | 59
Total | $ 15 | $ 59

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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