Stockholders' Equity (Stock Rollforward) (Details) - shares		3 Months Ended	12 Months Ended
	Feb. 27, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stock by Class
Common stock, shares issued, beginning of period		21,156,143	21,156,143
Treasury stock, shares, beginning of period		504,182	504,182
Changes related to deferred compensation plan:
Purchase of treasury stock					0
Changes related to Board Compensation:
Common shares issued under compensation plan for Boards of Directors		(3,680)
Changes related to stock issued in acquisitions:
Common stock, shares issued, end of period			21,193,402	21,156,143
Treasury stock, shares, end of period			1,686,046	504,182
Performance Shares [Member]
Changes related to Board Compensation:
Common shares issued under compensation plan for Boards of Directors			(9,395)
Changes related to stock issued in acquisitions:
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings			(6,127)
Common Stock
Increase (Decrease) in Stock by Class
Common stock, shares issued, beginning of period		21,156,143	21,156,143	20,124,378	18,952,385
Changes related to stock-based compensation awards:
Stock Issued During Period, Shares, Restricted Stock Award, Gross				0	0
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			0	0	0
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture				0	0
Changes related to dividend reinvestment plan:
Common shares issued under dividend reinvestment plan			37,259	26,287	19,282
Changes related to stock issued in acquisitions:
Common stock, shares issued, end of period			21,193,402	21,156,143	20,124,378
Treasury Stock
Increase (Decrease) in Stock by Class
Treasury stock, shares, beginning of period		504,182	504,182	601,289	702,449
Changes related to stock-based compensation awards:
Stock Issued During Period, Shares, Restricted Stock Award, Gross			(128,402)	(133,926)	(106,805)
Release of restricted common shares			27,391	19,174	32,082
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			33,689	11,113	2,011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					(102)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			(23,482)	(5,130)
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture					(16,544)
Changes related to deferred compensation plan:
Purchase of treasury stock			12,005	7,227	6,526
Disbursed out of treasury stock			(2,362)	(2,187)	(2,089)
Stock Repurchased During Period, Shares	6,300,000		1,299,577	26,427
Changes related to Board Compensation:
Common shares issued under compensation plan for Boards of Directors			(11,553)	(6,755)	(4,699)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			(18,872)	(13,050)	(11,530)
Changes related to stock issued in acquisitions:
Treasury stock, shares, end of period			1,686,046	504,182	601,289
Treasury Stock, Common
Changes related to deferred compensation plan:
Proceeds from Sale of Treasury Stock					(10)
ASB Financial Corp. | Common Stock
Changes related to stock issued in acquisitions:
Stock Issued During Period, Shares, Acquisitions					1,152,711
FIRST PRESTONSBURG BANCSHARES INC. [Member] | Common Stock
Changes related to stock issued in acquisitions:
Stock Issued During Period, Shares, Acquisitions				1,005,478