Revenue Recognition, Noninterest Income by Major Source (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation Of Revenue [Line Items]
Brokerage fees	$ 180	$ 170	$ 184
Bank-owned life insurance	361	362	361
Other service charges, commissions and other income	325	299	367
Loss on housing funds and other partnerships, net	(167)	(126)	(267)
Gain on call of securities available for sale	838		1
Gain on sale of mortgage loans held for sale, net	37	10
Total noninterest income	6,074	5,468	5,297
Trust and Estate Fees [Member]
Disaggregation Of Revenue [Line Items]
Total noninterest income	1,542	1,528	1,409
Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Total noninterest income	1,706	1,926	2,108
Intercharge Fee Income, Net [Member]
Disaggregation Of Revenue [Line Items]
Total noninterest income	$ 1,252	$ 1,299	$ 1,134