CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2021			25,300,793
Beginning balance at Dec. 31, 2021	$ 704,906	$ 704,817	$ 120,615	$ 583,134	$ 16,093	$ (15,025)	$ 89
Increase (Decrease) in Stockholders' Equity
Net income	77,840	77,840		77,840
Other comprehensive income (loss), net of tax	(237,822)	(237,822)			(237,822)
Cash dividends declared and paid	(30,637)	(30,637)		(30,637)
Treasury shares purchased under deferred directors' plan (in shares)			(6,732)
Treasury shares purchased under deferred directors' plan	0	0	$ 505			(505)
Treasury shares sold and distributed under deferred directors' plan (in shares)			8,555
Treasury shares sold and distributed under deferred directors' plan	0	0	$ (221)			221
Stock activity under equity compensation plans (in shares)			47,518
Stock activity under equity compensation plans	(1,780)	(1,780)	$ (1,780)
Stock based compensation expense	6,713	6,713	$ 6,713
Ending balance (in shares) at Sep. 30, 2022			25,350,134
Ending balance at Sep. 30, 2022	519,220	519,131	$ 125,832	630,337	(221,729)	(15,309)	89
Beginning balance (in shares) at Jun. 30, 2022			25,345,162
Beginning balance at Jun. 30, 2022	562,063	561,974	$ 123,571	612,026	(158,534)	(15,089)	89
Increase (Decrease) in Stockholders' Equity
Net income	28,525	28,525		28,525
Other comprehensive income (loss), net of tax	(63,195)	(63,195)			(63,195)
Cash dividends declared and paid	(10,214)	(10,214)		(10,214)
Treasury shares purchased under deferred directors' plan (in shares)			(3,158)
Treasury shares purchased under deferred directors' plan	0	0	$ 220			(220)
Stock activity under equity compensation plans (in shares)			8,130
Stock activity under equity compensation plans	(52)	(52)	$ (52)
Stock based compensation expense	2,093	2,093	$ 2,093
Ending balance (in shares) at Sep. 30, 2022			25,350,134
Ending balance at Sep. 30, 2022	$ 519,220	519,131	$ 125,832	630,337	(221,729)	(15,309)	89
Beginning balance (in shares) at Dec. 31, 2022	25,349,225		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	64,141	64,141		64,141
Other comprehensive income (loss), net of tax	(39,188)	(39,188)			(39,188)
Cash dividends declared and paid	(35,324)	(35,324)		(35,324)
Treasury shares purchased under deferred directors' plan (in shares)			(8,493)
Treasury shares purchased under deferred directors' plan	0	0	$ 491			(491)
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)			78,137
Stock activity under equity compensation plans	(3,124)	(3,124)	$ (3,124)
Stock based compensation expense	$ 1,792	1,792	$ 1,792
Ending balance (in shares) at Sep. 30, 2023	25,431,724		25,431,724
Ending balance at Sep. 30, 2023	$ 557,184	557,095	$ 125,758	674,917	(228,111)	(15,469)	89
Beginning balance (in shares) at Jun. 30, 2023			25,429,216
Beginning balance at Jun. 30, 2023	591,995	591,906	$ 123,367	661,447	(177,645)	(15,263)	89
Increase (Decrease) in Stockholders' Equity
Net income	25,252	25,252		25,252
Other comprehensive income (loss), net of tax	(50,466)	(50,466)			(50,466)
Cash dividends declared and paid	(11,782)	(11,782)		(11,782)
Treasury shares purchased under deferred directors' plan (in shares)			(3,992)
Treasury shares purchased under deferred directors' plan	0	0	$ 206			(206)
Stock activity under equity compensation plans (in shares)			6,500
Stock based compensation expense	$ 2,185	2,185	$ 2,185
Ending balance (in shares) at Sep. 30, 2023	25,431,724		25,431,724
Ending balance at Sep. 30, 2023	$ 557,184	$ 557,095	$ 125,758	$ 674,917	$ (228,111)	$ (15,469)	$ 89