Derivative Financial Instruments (Loan Swaps) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Feb. 05, 2016
Derivative [Line Items]
Cash pledged as collateral	$ 1,200,000	$ 2,200,000
Other Assets
Derivative [Line Items]
Notional Amount	14,045,000	14,549,000
Other Liabilities
Derivative [Line Items]
Notional Amount			$ 2,000,000
Back-to-back Swaps
Derivative [Line Items]
Cash pledged as collateral	1,600,000	1,800,000
Back-to-back Swaps | Other Assets
Derivative [Line Items]
Notional Amount	126,766,000	69,594,000
Fair Value	2,377,000	1,588,000
Back-to-back Swaps | Other Liabilities
Derivative [Line Items]
Notional Amount	126,766,000	69,594,000
Fair Value	(2,377,000)	(1,588,000)
Counterparties
Derivative [Line Items]
Cash pledged as collateral	0
Counterparties | Back-to-back Swaps
Derivative [Line Items]
Cash pledged as collateral	$ 190,000	$ 768,000
Receive Rate | Back-to-back Swaps | Other Assets
Derivative [Line Items]
Weighted Average Rate	4.70%	4.66%
Receive Rate | Back-to-back Swaps | Other Liabilities
Derivative [Line Items]
Weighted Average Rate	4.03%	3.47%
Pay Rate | Back-to-back Swaps | Other Assets
Derivative [Line Items]
Weighted Average Rate	4.03%	3.47%
Pay Rate | Back-to-back Swaps | Other Liabilities
Derivative [Line Items]
Weighted Average Rate	4.70%	4.66%