Guarantees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Guarantor Obligations [Line Items]
Commitments to Extend Credit, Nominal Amount	$ 321,143	$ 315,256
Standby Letters of Credit, Nominal Amount	4,466	3,526
Commitments to Extend Credit, Fair Value	0	0
Fair Value Disclosure, Letters of Credit Outstanding, Amount	$ 12	$ 23
Minimum
Guarantor Obligations [Line Items]
Letter of credit, fee percentage	1.00%
Maximum
Guarantor Obligations [Line Items]
Letter of credit, fee percentage	3.00%