Borrowings Federal Funds Purchased, Securities Sold Under Agreements to Repurchase and Short-term Borrowings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	$ 34,539	$ 33,975	$ 31,686
Weighted-average interest rate at year-end	0.90%	0.90%	1.04%
Maximum amount outstanding at any month's end	41,684	38,949	36,617
Average amount outstanding during the year	36,227	34,177	33,162
Weighted-average interest rate during the year	0.91%	0.97%	0.88%
Short-term borrowings
Short-term Borrowings	0	11,873	28,331
Weighted-average interest rate at year-end	3.14%	5.00%	5.00%
Maximum amount outstanding at any month's end	0	17,656	28,331
Average amount outstanding during the year	$ 0	$ 8,725	$ 9,555
Weighted-average interest rate during the year	3.45%	4.49%	3.33%