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Stockholders' Equity (Stock Rollforward) (Details)	12 Months Ended
Stockholders' Equity (Stock Rollforward) (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes related to private placement:
Common stock, shares issued, end of period	15,426,973us-gaap_CommonStockSharesIssued	11,206,576us-gaap_CommonStockSharesIssued
Treasury stock, shares, end of period	590,246us-gaap_TreasuryStockShares	600,794us-gaap_TreasuryStockShares
Common Stock
Increase (Decrease) in Stock by Class
Common stock, shares issued, beginning of period	11,206,576	11,155,648	11,122,247
Changes related to stock-based compensation awards:
Release of restricted common shares	68,754	31,246	14,552
Changes related to dividend reinvestment plan:
Common shares issued under dividend reinvestment plan	17,230	19,682	18,849
Changes related to private placement:
Common stock, shares issued, end of period	15,426,973	11,206,576	11,155,648
Treasury Stock
Increase (Decrease) in Stock by Class
Treasury stock, shares, beginning of period	600,794	607,688	615,123
Changes related to stock-based compensation awards:
Release of restricted common shares	18,031	6,862	4,270
Changes related to deferred compensation plan:
Purchase of treasury stock	4,236	3,652	3,918
Reissuance of treasury stock	(9,390)	(9,147)	(8,897)
Changes related to Board Compensation:
Common shares issued under compensation plan for Board of Directors	(8,603)	(8,261)	(6,726)
Changes related to private placement:
Treasury stock, shares, end of period	590,246	600,794	607,688
Treasury Stock
Changes related to stock-based compensation awards:
Reissuance of treasury stock for common stock awards	(12,030)
Treasury Stock \| Stock Options
Changes related to stock-based compensation awards:
Exercise of stock options for common shares	(2,792)
Midwest Bancshares, Inc. \| Common Stock
Changes related to stock issued in acquisitions:
Stock Issued During Period, Shares, Acquisitions	256,282
Ohio Heritage Bancorp, Inc. \| Common Stock
Changes related to stock issued in acquisitions:
Stock Issued During Period, Shares, Acquisitions	1,364,735
North Akron Savings Bank \| Common Stock
Changes related to stock issued in acquisitions:
Stock Issued During Period, Shares, Acquisitions	665,570
Private Placement [Member] \| Common Stock
Changes related to private placement:
Issuance of Private Placement	1,847,826