Nature of Banking Activities and Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) Office
Nature of Banking Activities and Significant Accounting Policies [Line Items]
Number of banking offices | Office	11
Number of days past due before a loan is considered nonaccrual	90 days
Uncertain tax positions	$ 0
ASU 2016-02 [Member]
Nature of Banking Activities and Significant Accounting Policies [Line Items]
Effect of adoption of new accounting standard	$ 5,600,000
Minimum [Member]
Nature of Banking Activities and Significant Accounting Policies [Line Items]
Number of days past due after loan is considered accrual	90 days
Useful lives	3 years
Percentage of tax benefit	50.00%
Minimum [Member] | Software [Member]
Nature of Banking Activities and Significant Accounting Policies [Line Items]
Useful lives	3 years
Maximum [Member]
Nature of Banking Activities and Significant Accounting Policies [Line Items]
Useful lives	39 years
Maximum [Member] | Software [Member]
Nature of Banking Activities and Significant Accounting Policies [Line Items]
Useful lives	5 years