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Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands			9 Months Ended
	Jul. 23, 2019 USD ($) Branch $ / shares shares	Aug. 20, 2018 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Total Assets			$ 12,593,887		$ 12,458,632
Portfolio loans, net of unearned income			7,756,752		7,656,281
Deposits			8,664,363		8,831,633
Total shareholders' equity			2,101,269	$ 2,074,116	$ 1,978,827	$ 1,927,269	$ 1,524,106	$ 1,395,321
Farmers Capital Bank Corporation [Member]
Business Acquisition [Line Items]
Total Assets		$ 1,600,000
Portfolio loans, net of unearned income		1,000,000
Securities		239,321
Value of acquisition		$ 428,901
Closing stock price | $ / shares		$ 49.40
Number of shares issued for acquisition | shares		7,920,387
Cash consideration for outstanding FFKT shares		$ 37,634
Goodwill acquired		223,304
Purchase price allocation in core deposit intangible		39,992
Merger related expense			3,200
Old Line [Member] | Definitive Agreement and Plan of Merger [Member]
Business Acquisition [Line Items]
Total Assets	$ 3,100,000
Portfolio loans, net of unearned income	2,400,000
Value of acquisition	$ 500,100
Number of shares issued for acquisition | shares	0.7844
Merger related expense			$ 1,700
Deposits	$ 2,400,000
Total shareholders' equity	$ 400,000
Number of branches acquired | Branch	37
Business acquisition, price per share | $ / shares	$ 29.22
Community Banking [Member] | Farmers Capital Bank Corporation [Member]
Business Acquisition [Line Items]
Purchase price allocation in core deposit intangible		37,400
Trust And Investment Services [Member] | Customer Relationships [Member] | Farmers Capital Bank Corporation [Member]
Business Acquisition [Line Items]
Purchase price allocation in core deposit intangible		$ 2,600

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