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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
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