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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, 2019 | Dec. 31, 2018
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Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | $ 1,639 | $ 1,153
90 or More Days Past Due | 4,755 | 6,404
Total Past Due | 6,394 | 7,557
Current | 89,229 | 38,844
Total | 95,623 | 46,401
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 922 | 0
90 or More Days Past Due | 532 | 0
Total Past Due | 1,454 | 0
Current | 14,319 | 2,159
Total | 15,773 | 2,159
CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 0 | 416
90 or More Days Past Due | 2,115 | 88
Total Past Due | 2,115 | 504
Current | 37,214 | 23,435
Total | 39,329 | 23,939
CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 0 | 591
90 or More Days Past Due | 1,023 | 6,279
Total Past Due | 1,023 | 6,870
Current | 19,412 | 2,799
Total | 20,435 | 9,669
Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 14 | 0
90 or More Days Past Due | 217 | 0
Total Past Due | 231 | 0
Current | 7,616 | 4,548
Total | 7,847 | 4,548
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 703 | 146
90 or More Days Past Due | 833 | 37
Total Past Due | 1,536 | 183
Current | 10,475 | 5,899
Total | 12,011 | 6,082
Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
30-89 Days Past Due | 0 | 0
90 or More Days Past Due | 35 | 0
Total Past Due | 35 | 0
Current | 193 | 4
Total | $ 228 | $ 4

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