Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)	Total	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Cumulative Effect, Period of Adoption, Adjustment	BBM & Associates, Inc.	LINCO Bancshares, Inc.	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock BBM & Associates, Inc.	Common Stock LINCO Bancshares, Inc.	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Additional Paid-in Capital BBM & Associates, Inc.	Additional Paid-in Capital LINCO Bancshares, Inc.	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Deferred Compensation	Deferred Compensation Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Beginning balance at Dec. 31, 2019	$ 526,609,000	$ 525,892,000				$ 71,152,000	$ 71,152,000			$ 295,925,000	$ 295,925,000			$ 166,667,000	$ 165,950,000		$ 2,760,000	$ 2,760,000	$ 8,360,000	$ 8,360,000	$ (18,255,000)	$ (18,255,000)
Beginning balance (ASU 2016-13) at Dec. 31, 2019			$ (717,000)													$ (717,000)
Net income	20,136,000													20,136,000
Other comprehensive income (loss), net tax	8,745,000																		8,745,000
Cash dividends on common stock	(6,651,000)													(6,651,000)
Issuance of common shares pursuant to the dividend reinvestment plan	336,000					54,000				282,000
Issuance of common shares pursuant to the deferred compensation plan	228,000					33,000				195,000
Issuance of restricted shares pursuant to the 2017 Stock Incentive Plan	868,000					101,000				767,000
Issuance of common shares pursuant to the employee stock purchase plan	163,000					30,000				133,000
Deferred compensation																	138,000				(138,000)
Tax benefit related to deferred compensation distributions	22,000									22,000
Grant of restricted units pursuant to 2017 Stock Incentive Plan	584,000									584,000
Release of restricted units pursuant to 2017 Stock Incentive Plan	(516,000)									(516,000)
Vested restricted shares/units compensation expense	(534,000)																(534,000)
Ending balance at Jun. 30, 2020	549,273,000					71,370,000				297,392,000				179,435,000			2,364,000		17,105,000		(18,393,000)
Beginning balance at Mar. 31, 2020	533,051,000					71,268,000				296,853,000				175,949,000			2,022,000		5,209,000		(18,250,000)
Net income	10,137,000													10,137,000
Other comprehensive income (loss), net tax	11,896,000																		11,896,000
Cash dividends on common stock	(6,651,000)													(6,651,000)
Issuance of common shares pursuant to the dividend reinvestment plan	336,000					54,000				282,000
Issuance of common shares pursuant to the deferred compensation plan	228,000					33,000				195,000
Issuance of common shares pursuant to the employee stock purchase plan	77,000					15,000				62,000
Deferred compensation																	143,000				(143,000)
Vested restricted shares/units compensation expense	199,000																199,000
Ending balance at Jun. 30, 2020	549,273,000					71,370,000				297,392,000				179,435,000			2,364,000		17,105,000		(18,393,000)
Beginning balance at Dec. 31, 2020	568,228,000					71,449,000				297,806,000				197,726,000			2,980,000		17,095,000		(18,828,000)
Net income	16,330,000													16,330,000
Other comprehensive income (loss), net tax	(8,314,000)																		(8,314,000)
Cash dividends on common stock	(7,122,000)													(7,122,000)
Issuance of common shares pursuant to the dividend reinvestment plan	332,000					32,000				300,000
Issuance of common shares pursuant to the deferred compensation plan	189,000					23,000				166,000
Issuance of restricted shares pursuant to the 2017 Stock Incentive Plan	943,000					111,000				832,000
Issuance of 2,375 common shares pursuant to the 2017 Stock Incentive Plan	85,000					10,000				75,000
Issuance of shares pursuant to the acquisition				$ 1,109,000	$ 44,191,000			$ 100,000	$ 5,049,000			$ 1,009,000	$ 39,142,000
Issuance of common shares pursuant to the employee stock purchase plan	158,000					23,000				135,000
Deferred compensation																	(188,000)				188,000
Tax benefit related to deferred compensation distributions	355,000									355,000
Grant of restricted units pursuant to 2017 Stock Incentive Plan	1,216,000									1,216,000
Release of restricted units pursuant to 2017 Stock Incentive Plan	(584,000)									(584,000)
Vested restricted shares/units compensation expense	(1,050,000)																(1,050,000)
Ending balance at Jun. 30, 2021	616,066,000					76,797,000				340,452,000				206,934,000			1,742,000		8,781,000		(18,640,000)
Beginning balance at Mar. 31, 2021	601,884,000					76,652,000				338,897,000				198,408,000			1,597,000		5,087,000		(18,757,000)
Net income	12,221,000													12,221,000
Other comprehensive income (loss), net tax	3,694,000																		3,694,000
Cash dividends on common stock	(3,695,000)													(3,695,000)
Issuance of common shares pursuant to the dividend reinvestment plan	161,000					15,000				146,000
Issuance of common shares pursuant to the deferred compensation plan	171,000					20,000				151,000
Issuance of shares pursuant to the acquisition				$ 1,109,000				$ 100,000				$ 1,009,000
Issuance of common shares pursuant to the employee stock purchase plan	83,000					10,000				73,000
Deferred compensation																	(117,000)				117,000
Tax benefit related to deferred compensation distributions	176,000									176,000
Vested restricted shares/units compensation expense	262,000																262,000
Ending balance at Jun. 30, 2021	$ 616,066,000					$ 76,797,000				$ 340,452,000				$ 206,934,000			$ 1,742,000		$ 8,781,000		$ (18,640,000)