Fair Value Measurements (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2017 item
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assets, level 1 to 2	$ 0	$ 0
Fair value assets, level 2 to 1	0	0
Fair value assets, transfer into level 3	0
Fair value assets, transfer out of level 3	0
Fair value liabilities, level 1 to 2	0	0
Fair value liabilities, level 2 to 1	0	0
Fair value liabilities, transfer into level 3	0
Fair value liabilities, transfer out of level 3	0
Fair value assets, transfer from level 2 to level 3 | item				1
Loans with impairment, unpaid principal	$ 4,100	4,200
Small Office Condo [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long Lived Assets To Be Disposed Of Fair Value			$ 345
Proceeds from Sale of Property, Plant, and Equipment		392
Gain (Loss) on Disposition of Property Plant Equipment		$ 47