Short-Term Borrowings (Narrative) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Aug. 04, 2014	Dec. 18, 2012
Short-term Borrowings
Revolving Line of Credit	$ 395,316,000	$ 283,231,000
Federal Funds Available from Correspondent Banks	$ 25,000,000
Unused line of credit, fixed rate	0.00%	3.50%	3.50%	3.80%
Short-term borrowings	$ 160,386,000	$ 88,277,000
Holding Company
Short-term Borrowings
Revolving Line of Credit	$ 15,000,000	$ 5,000,000	$ 10,000,000
Unused line of credit, fixed rate	3.00%
Line of Credit [Member] | Holding Company
Short-term Borrowings
Short-term borrowings	$ 0
Expiring in early 2016 [Member]
Short-term Borrowings
Federal Funds Available from Correspondent Banks	$ 20,000,000