Employee Benefits (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule Of Employee Benefits [Line Items]
Percentage of internal revenue contribution	25.00%
Percentage of internal revenue service limitations	6.00%
Cash surrender value of life insurance	$ 18,118	$ 18,018
Increase in cash surrender value of insurance	100		$ 99
Accrued expenses and other liabilities	9,643	10,108
Noninterest expense	6,918		6,366
Employer contribution in defined contribution plan	225		196
Directors' Plan
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	1,851	1,687
Noninterest expense	32		32
Executive Long-Term Incentive and Retention Plan
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	991	975
Noninterest expense	$ 137		113
Executive Long-Term Incentive and Retention Plan | Maximum
Schedule Of Employee Benefits [Line Items]
Terms of services	5 years
Executive Long-Term Incentive and Retention Plan | Minimum
Schedule Of Employee Benefits [Line Items]
Terms of services	1 year
Group Term Replacement Plan
Schedule Of Employee Benefits [Line Items]
Liability related to these postretirement benefits	$ 1,290	1,276
Postemployment benefit expense	13		$ 13
Other Director and Officer Postretirement Benefits
Schedule Of Employee Benefits [Line Items]
Noninterest expense	24	26
Postemployment benefit expense	$ 2,116	$ 2,108
Other Director and Officer Postretirement Benefits | Maximum
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period	20 years
Other Director and Officer Postretirement Benefits | Minimum
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period	15 years