Stockholders' Equity (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0
Issuance of common shares related to acquisition of NB&T Financial Group, Inc.	$ 76,027
Preferred stock - shares authorized	50,000	50,000
Preferred stock - shares issued	0	0
Common Shares | NB&T Financial Group, Inc.
Class of Stock [Line Items]
Shares issued for acquisition (in shares)	3,207,698
Issuance of common shares related to acquisition of NB&T Financial Group, Inc.	$ 76,027