Derivative Financial Instruments (Back-to-back loan swaps) (Balance sheet category and fair values) (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Feb. 05, 2016
Other liabilities
Derivative [Line Items]
Notional Amount			$ 2,000,000
Back-to-Back Loan Swaps | Other assets
Derivative [Line Items]
Notional Amount	$ 90,370,000	$ 69,594,000
Fair Value, Receive fixed-pay floating interest rate swap	$ 1,906,000	$ 1,588,000
Weighted Average Receive Rate	4.75%	4.66%
Weighted Average Pay Rate	3.91%	3.47%
Back-to-Back Loan Swaps | Other liabilities
Derivative [Line Items]
Notional Amount	$ 90,370,000	$ 69,594,000
Fair Value, Pay fixed-receive floating interest rate swap	$ (1,906,000)	$ (1,588,000)
Weighted Average Receive Rate	3.91%	3.47%
Weighted Average Pay Rate	4.75%	4.66%