CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Total Stockholders’ Equity	Total Stockholders’ Equity Cumulative Effect, Period of Adoption, Adjustment	Total Stockholders’ Equity Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Noncontrolling Interest	Noncontrolling Interest Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance (in shares) at Dec. 31, 2022							25,349,225
Beginning balance at Dec. 31, 2022	$ 568,887			$ 568,798			$ 127,004		$ 646,100			$ (188,923)		$ (15,383)		$ 89
Increase (Decrease) in Stockholders' Equity
Net income	38,889			38,889					38,889
Other comprehensive income (loss), net of tax	11,278			11,278								11,278
Cash dividends declared and paid	(23,542)			(23,542)					(23,542)
Treasury shares purchased under deferred directors' plan (in shares)							(4,501)
Treasury shares purchased under deferred directors' plan	0			0			$ 285							(285)
Treasury shares sold and distributed under deferred directors' plan (in shares)							12,855
Treasury shares sold and distributed under deferred directors' plan	0			0			$ (405)							405
Stock activity under equity compensation plans (in shares)							71,637
Stock activity under equity compensation plans	(3,124)			(3,124)			$ (3,124)
Stock based compensation expense	(393)			(393)			$ (393)
Ending balance (in shares) at Jun. 30, 2023							25,429,216
Ending balance at Jun. 30, 2023	591,995			591,906			$ 123,367		661,447			(177,645)		(15,263)		89
Beginning balance (in shares) at Dec. 31, 2022							25,349,225
Beginning balance at Dec. 31, 2022	$ 568,887			568,798			$ 127,004		646,100			(188,923)		(15,383)		89
Increase (Decrease) in Stockholders' Equity
Accounting standards update	Accounting Standards Update 2023-02 [Member]
Ending balance (in shares) at Dec. 31, 2023	25,430,566						25,430,566	25,430,566
Ending balance at Dec. 31, 2023	$ 649,793	$ (532)	$ 649,261	649,704	$ (532)	$ 649,172	$ 127,692	$ 127,692	692,760	$ (532)	$ 692,228	(155,195)	$ (155,195)	(15,553)	$ (15,553)	89	$ 89
Beginning balance (in shares) at Mar. 31, 2023							25,430,917
Beginning balance at Mar. 31, 2023	602,006			601,917			$ 125,840		658,629			(167,370)		(15,182)		89
Increase (Decrease) in Stockholders' Equity
Net income	14,611			14,611					14,611
Other comprehensive income (loss), net of tax	(10,275)			(10,275)								(10,275)
Cash dividends declared and paid	(11,793)			(11,793)					(11,793)
Treasury shares purchased under deferred directors' plan (in shares)							(1,701)
Treasury shares purchased under deferred directors' plan	0			0			$ 81							(81)
Stock based compensation expense	(2,554)			(2,554)			$ (2,554)
Ending balance (in shares) at Jun. 30, 2023							25,429,216
Ending balance at Jun. 30, 2023	$ 591,995			591,906			$ 123,367		661,447			(177,645)		(15,263)		89
Beginning balance (in shares) at Dec. 31, 2023	25,430,566						25,430,566	25,430,566
Beginning balance at Dec. 31, 2023	$ 649,793	$ (532)	$ 649,261	649,704	$ (532)	$ 649,172	$ 127,692	$ 127,692	692,760	$ (532)	$ 692,228	(155,195)	$ (155,195)	(15,553)	$ (15,553)	89	$ 89
Increase (Decrease) in Stockholders' Equity
Net income	45,950			45,950					45,950
Other comprehensive income (loss), net of tax	(15,263)			(15,263)								(15,263)
Cash dividends declared and paid	(24,637)			(24,637)					(24,637)
Treasury shares purchased under deferred directors' plan (in shares)							(4,578)
Treasury shares purchased under deferred directors' plan	0			0			$ 291							(291)
Treasury shares sold and distributed under deferred directors' plan (in shares)							13,275
Treasury shares sold and distributed under deferred directors' plan	0			0			$ (391)							391
Stock activity under equity compensation plans (in shares)							64,481
Stock activity under equity compensation plans	(2,596)			(2,596)			$ (2,596)
Stock based compensation expense	$ 1,875			1,875			$ 1,875
Ending balance (in shares) at Jun. 30, 2024	25,503,744						25,503,744
Ending balance at Jun. 30, 2024	$ 654,590			654,501			$ 126,871		713,541			(170,458)		(15,453)		89
Beginning balance (in shares) at Mar. 31, 2024							25,503,425
Beginning balance at Mar. 31, 2024	647,009			646,920			$ 125,873		703,330			(166,913)		(15,370)		89
Increase (Decrease) in Stockholders' Equity
Net income	22,549			22,549					22,549
Other comprehensive income (loss), net of tax	(3,545)			(3,545)								(3,545)
Cash dividends declared and paid	(12,338)			(12,338)					(12,338)
Treasury shares purchased under deferred directors' plan (in shares)							(1,348)
Treasury shares purchased under deferred directors' plan	0			0			$ 83							(83)
Stock activity under equity compensation plans (in shares)							1,667
Stock activity under equity compensation plans	(80)			(80)			$ (80)
Stock based compensation expense	$ 995			995			$ 995
Ending balance (in shares) at Jun. 30, 2024	25,503,744						25,503,744
Ending balance at Jun. 30, 2024	$ 654,590			$ 654,501			$ 126,871		$ 713,541			$ (170,458)		$ (15,453)		$ 89