Borrowed Funds Narrative Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Borrowed Funds Narrative Data [Line Items]
Option advance borrowings from the FHLB	$ 47,164	$ 27,500
FHLB borrowing capacity, loans pledged	207,700	167,700
FHLB borrowing capacity, maximum available	127,500	100,100
FHLB borrowings and other credit subject to collateralization	61,700	45,600
FHLB borrowing capacity, unused and available	65,800	54,500
FHLB Letters of Credit, collateral for deposits	24,800	17,300
FHLB Letters of Credit, fees paid	27	28
Secured customer repurchase agreement sweeps	0	370
Securities pledged for customer repurchase agreement sweeps		1,700
Repurchase agreement sweeps, average daily balance		$ 551
Repurchase agreement sweeps, weighted average interest rate for the year		0.26%
Repurchase agreement sweeps, maximum borrowings outstanding during the year		$ 3,500
Repurchase agreement sweeps, weighted average interest rate at year end		0.20%
Union [Member]
Borrowed Funds Narrative Data [Line Items]
Correspondent banks line of credit, maximum available	15,000
Correspondent banks line of credit, amount outstanding	0	$ 0
Company [Member]
Borrowed Funds Narrative Data [Line Items]
Correspondent banks line of credit, maximum available	5,000
Correspondent banks line of credit, amount outstanding	$ 0
Interest rate, low range [Member]
Borrowed Funds Narrative Data [Line Items]
FHLB borrowings interest rate	0.00%	0.00%
Interest rate, high range [Member]
Borrowed Funds Narrative Data [Line Items]
FHLB borrowings interest rate	3.09%	2.59%
Weighted average interest rate [Member]
Borrowed Funds Narrative Data [Line Items]
FHLB borrowings interest rate	2.01%	1.84%