Fair Value (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assets and liabilities transfer level 1 to level 3	0		0		0
Fair value assets and liabilities transfer level 3 to level 1	0		0		0
Unpaid principal balance of impairment loan at collateral	$ 3,042,000		$ 3,042,000		$ 3,087,000
Valuation allowance	24,000		24,000		24,000
Fair value option, 90 days or more past due	0		0		0
Write-downs of impaired collateral-dependent loans	0	$ 0	0	$ 0
Loans 90 days or more past due and still accruing interest
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a recurring basis	0		0		0
Liabilities measured at fair value on a recurring basis	0		0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a recurring basis	0		0		0
Liabilities measured at fair value on a recurring basis	0		0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a recurring basis	0		0		0
Liabilities measured at fair value on a recurring basis	0		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a recurring basis	0		0		0
Liabilities measured at fair value on a recurring basis	$ 0		$ 0		$ 0