Loans and Allowance for Loan Losses - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Loan Property	Sep. 30, 2018 Loan Property	Sep. 30, 2019 USD ($) Loan Property	Sep. 30, 2018 Loan Property	Dec. 31, 2018 USD ($) Loan
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	0	0	0
Number of TDR loans in the portfolio	5		5		6
TDR loans in the portfolio | $	$ 2.5		$ 2.5		$ 3.4
Number of TDR loans current and performing	5		5		5
Number of TDRs with defaults occurring within 12 months of modification	0	0	0	0
Residential Real Estate [Member]
Troubled Debt Restructurings [Abstract]
Number of foreclosed properties in possession or in process of foreclosure | Property	0	0	0	0