Stockholders' Equity (Stock Rollforward) (Details)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Stock by Class [Roll Forward]
Common stock, beginning of period		15,426,973us-gaap_CommonStockSharesIssued
Treasury stock, beginning of period		590,246us-gaap_TreasuryStockShares
Changes related to deferred compensation plan for Boards of Directors:
Common stock, end of period	18,918,525us-gaap_CommonStockSharesIssued	15,426,973us-gaap_CommonStockSharesIssued
Treasury stock, end of period	599,738us-gaap_TreasuryStockShares	590,246us-gaap_TreasuryStockShares
Common Stock
Increase (Decrease) in Stock by Class [Roll Forward]
Common stock, beginning of period	15,599,643
Changes related to stock-based compensation awards:
Grants of restricted common shares	107,036
Changes related to deferred compensation plan for Boards of Directors:
Common shares issued under dividend reinvestment plan	4,148
Common stock, end of period	18,918,525
Treasury Stock
Increase (Decrease) in Stock by Class [Roll Forward]
Treasury stock, beginning of period	590,246
Changes related to stock-based compensation awards:
Release of restricted common shares	21,636
Changes related to deferred compensation plan for Boards of Directors:
Purchase of treasury stock	1,256
Reissuance of treasury stock	(8,125)
Common shares issued under compensation plan for Board of Directors	(2,100)
Common shares issued under employee stock purchase plan	(3,175)
Treasury stock, end of period	599,738
Treasury Stock \| Stock Options
Changes related to stock-based compensation awards:
Treasury Stock, Value	0
NB&T Financial Group, Inc. [Member]
Changes related to deferred compensation plan for Boards of Directors:
NB&T Financial Group, Inc.	3,207,698
NB&T Financial Group, Inc. [Member] \| Common Stock
Changes related to deferred compensation plan for Boards of Directors:
NB&T Financial Group, Inc.	3,207,698

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Number of shares of stock issued during the period pursuant to acquisitions.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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