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	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	$ 2,041	$ 1,153
90 or More Days Past Due	3,339	6,404
Total Past Due	5,380	7,557
Current	84,909	38,844
Total	90,289	46,401
Commercial and industrial
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	356	0
Total Past Due	356	0
Current	14,978	2,159
Total	15,334	2,159
CRE - investor owned
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	1,250	416
90 or More Days Past Due	1,340	88
Total Past Due	2,590	504
Current	34,313	23,435
Total	36,903	23,939
CRE - owner occupied
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	0	591
90 or More Days Past Due	434	6,279
Total Past Due	434	6,870
Current	18,481	2,799
Total	18,915	9,669
Construction and land development
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	217	0
Total Past Due	217	0
Current	7,676	4,548
Total	7,893	4,548
Residential real estate
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	791	146
90 or More Days Past Due	992	37
Total Past Due	1,783	183
Current	9,286	5,899
Total	11,069	6,082
Consumer and other
Financing Receivable, 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	175	4
Total	$ 175	$ 4