Loans and Allowance - Summary of Troubled Debt Restructurings by Modification Type (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modification	$ 90
Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modification	90
Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modification	0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modification	90
Residential | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modification	90
Residential | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modification	$ 0