Fair Value (Narrative) (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 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
Fair value assets and liabilities transfer level 3 to level 1			0		0
Unpaid principal balance of impairment loan at collateral			$ 4,109,000		$ 2,672,000
Valuation allowance			33,000		21,000
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a recurring basis			0		0
Liabilities measured at fair value on a recurring basis			0		0
Assets measured at fair value on a nonrecurring basis			0		0
Liabilities measured at fair value on a nonrecurring basis			0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis			0		0
Liabilities measured at fair value on a nonrecurring basis			0		0
Fair Value, Inputs, Level 3 [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
Liabilities measured at fair value on a recurring basis			$ 0		$ 0