Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Farmers Capital Bank Corporation [Member]	First Sentry Bancshares, Inc. [Member]	Old Line Bancshares, Inc. [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Preferred Stock [Member]	Common Stock	Common Stock Farmers Capital Bank Corporation [Member]	Common Stock First Sentry Bancshares, Inc. [Member]	Common Stock Old Line Bancshares, Inc. [Member]	Capital Surplus [Member]	Capital Surplus [Member] Farmers Capital Bank Corporation [Member]	Capital Surplus [Member] First Sentry Bancshares, Inc. [Member]	Capital Surplus [Member] Old Line Bancshares, Inc. [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Treasury Stock [Member] First Sentry Bancshares, Inc. [Member]	Accumulated Other Comprehensive Gain (Loss) [Member]	Accumulated Other Comprehensive Gain (Loss) [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Deferred Benefits for Directors [Member]
Beginning Balance at Dec. 31, 2017	$ 1,395,321						$ 91,756				$ 684,730				$ 651,357	$ 1,063			$ (31,495)	$ (1,063)	$ (1,027)
Beginning Balance, shares at Dec. 31, 2017							44,043,244
Net income	143,112														143,112
Other comprehensive income (loss)	(5,313)																		(5,313)
Comprehensive income	137,799
Common dividends declared	$ (57,951)														(57,951)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member
Shares issued for acquisition		$ 107,347	$ 391,267					$ 5,206	$ 16,487			$ 102,141	$ 374,464					$ 316
Shares issued for acquisition, shares								2,498,761	7,920,387
Treasury shares acquired	$ (697)										292						$ (989)
Treasury shares acquired, shares							(21,322)
Stock options exercised	1,849						$ 104				1,346						399
Stock options exercised, shares							58,763
Restricted stock granted							$ 205				(205)
Restricted stock granted, shares							98,301
Stock compensation expense	4,361										4,361
Deferred benefits for directors- net	(469)										(428)										(41)
Ending Balance at Dec. 31, 2018	1,978,827						$ 113,758				1,166,701				737,581		(274)		(37,871)		(1,068)
Ending Balance, shares at Dec. 31, 2018							54,598,134
Net income	158,873														158,873
Other comprehensive income (loss)	39,072																		39,072
Comprehensive income	197,945
Common dividends declared	(71,760)														(71,760)
Shares issued for acquisition				$ 493,935						$ 27,815				$ 466,120
Shares issued for acquisition, shares										13,351,837
Treasury shares acquired	(10,298)										181						(10,479)
Treasury shares acquired, shares							(281,365)
Stock options exercised	159						$ 8										151
Stock options exercised, shares							7,375
Restricted stock granted							$ 246				(1,385)						1,139
Restricted stock granted, shares							148,447
Stock compensation expense	5,321										5,321
Deferred benefits for directors- net	(208)										28										(236)
Ending Balance at Dec. 31, 2019	2,593,921				$ (26,591)		$ 141,827				1,636,966				824,694	$ (26,591)	(9,463)		1,201		(1,304)
Ending Balance, shares at Dec. 31, 2019							67,824,428
Net income	122,044														122,044
Other comprehensive income (loss)	30,158																		30,158
Comprehensive income	152,202
Common dividends declared	(85,815)														(85,815)
Preferred dividends declared ($17.625 per share)	$ (2,644)														(2,644)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Issuance of preferred stock, net of issuance costs	$ 144,484					$ 144,484
Treasury shares acquired	(25,296)										118						(25,414)
Treasury shares acquired, shares							(813,108)
Stock options exercised	$ 976						$ 7				(1,206)						2,175
Stock options exercised, shares	61,623						61,623
Restricted stock granted											(6,753)						6,753
Restricted stock granted, shares							181,763
Stock compensation expense	$ 5,653										5,653
Deferred benefits for directors- net	(153)										37										(190)
Ending Balance at Dec. 31, 2020	$ 2,756,737					$ 144,484	$ 141,834				$ 1,634,815				$ 831,688		$ (25,949)		$ 31,359		$ (1,494)
Ending Balance, shares at Dec. 31, 2020							67,254,706