Commitments and Contingences (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Operating Leases
Total lease liability	$ 10,080,000
Right-of-use assets	10,044,000
Operating Lease, Payments	$ 183,000
Weighted average remaining lease term	18 years 3 months 22 days
Weighted average discount rate	3.48%
Lease cost	$ 220,000
Rent expense		$ 234,000
Rent expense for closed leased properties		$ 58,000
Minimum
Operating Leases
Remaining lease term	6 years
Maximum
Operating Leases
Remaining lease term	26 years