Consolidated Statement of Shareholders' Equity - 9 months ended Sep. 30, 2019 - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Restricted Shares	Restricted Shares Common Stock	Restricted Shares Treasury Stock	FIRST PRESTONSBURG BANCSHARES INC. [Member] Common Stock
Balance, December 31, 2018 at Dec. 31, 2018	$ 520,140	$ 386,814	$ 160,346	$ (12,933)	$ (14,087)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	38,835		38,835
Other comprehensive income, net of tax	14,022			14,022
Cash dividends declared	(19,943)		(19,943)
Reissuance of treasury stock for deferred compensation plan for Boards of Directors						$ 0	$ (2,951)	$ 2,951
Reissuance of treasury stock for deferred compensation plan for Boards of Directors	53				53
Repurchase of treasury stock in connection with employee incentive plan and under compensation plan for Boards of Directors	(790)				(790)
Treasury Stock, Value, Acquired, Cost Method	431				431
Common shares issued under dividend reinvestment plan	678	678
Common shares issued under compensation plan for Boards of Directors	261	65			196
Stock Issued During Period, Value, Employee Stock Purchase Plan	327	83			244
Share-based Compensation	2,944	2,944
Stock Issued During Period, Value, Acquisitions	32,437								$ 32,437
Balance, September 30, 2019 at Sep. 30, 2019	$ 588,533	$ 420,070	$ 179,238	$ 1,089	$ (11,864)