Short-Term Borrowings (Short Term Borrowing) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-term Borrowings
Short-term borrowings	$ 160,386	$ 88,277
Interest on short-term borrowings	182	146	$ 114
Retail Repurchase Agreements
Short-term Borrowings
Short-term borrowings	84,386	73,277	42,590
Average balance	83,574	59,324	37,077
Highest month-end balance	92,711	76,459	46,850
Interest on short-term borrowings	$ 140	$ 99	$ 58
Weighted Average Interest Rate, End of Year	0.17%	0.17%	0.16%
Weighted Average Interest Rate, During the Year	0.17%	0.17%	0.16%
FHLB Advances
Short-term Borrowings
Short-term borrowings	$ 76,000	$ 15,000	$ 71,000
Average balance	16,863	36,678	44,127
Highest month-end balance	76,000	108,000	92,500
Interest on short-term borrowings	$ 42	$ 47	$ 55
Weighted Average Interest Rate, End of Year	0.35%	0.14%	0.14%
Weighted Average Interest Rate, During the Year	0.25%	0.13%	0.12%
Other Short-Term Borrowings
Short-term Borrowings
Short-term borrowings	$ 0	$ 0	$ 0
Average balance	0	38	90
Highest month-end balance	0	0	0
Interest on short-term borrowings	$ 0	$ 0	$ 1
Weighted Average Interest Rate, End of Year	0.00%	0.00%	0.00%
Weighted Average Interest Rate, During the Year	0.00%	0.75%	0.74%