Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 12, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock
Stock Repurchase Program, Authorized Amount		$ 20,000
Purchase of treasury stock		0
Purchase of treasury stock		$ 741	$ 520	$ 228
Proceeds from Issuance of Private Placement			$ 40,162
Preferred stock, shares authorized		50,000	50,000
Preferred stock, shares issued		0	0
Common Stock
Class of Stock
Proceeds from Issuance of Private Placement			$ 40,162
Private Placement [Member] | Common Stock
Class of Stock
Issuance of Private Placement		1,847,826
Proceeds from Issuance of Private Placement		$ 40,200
Sale of Stock, Price Per Share		$ 23.00
NB&T Financial Group, Inc. [Member] | Common Stock
Class of Stock
Stock Issued During Period, Shares, Acquisitions		3,207,698
Stock Issued During Period, Value, Acquisitions		$ 76,027
Subsequent Event [Member]
Class of Stock
Purchase of treasury stock	253,870
Purchase of treasury stock	$ 4,500