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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
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due $ 1,116 $ 328
90 or More Days Past Due 959 3,962
Total Past Due 2,075 4,290
Current 64,531 69,864
Total 66,606 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 2,966 3,212
Total 2,966 3,212
CRE - investor owned    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 944 0
90 or More Days Past Due 0 3,034
Total Past Due 944 3,034
Current 36,193 39,853
Total 37,137 42,887
CRE - owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 0 0
90 or More Days Past Due 665 673
Total Past Due 665 673
Current 10,221 10,659
Total 10,886 11,332
Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 88 0
90 or More Days Past Due 0 0
Total Past Due 88 0
Current 5,465 5,883
Total 5,553 5,883
Residential real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 84 328
90 or More Days Past Due 294 255
Total Past Due 378 583
Current 9,630 10,198
Total 10,008 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 56 59
Total $ 56 $ 59