CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest
Balance (in shares) at Dec. 31, 2019				25,444,275
Balance at Dec. 31, 2019	$ 598,100		$ 598,011	$ 114,858	$ 475,247	$ 12,059	$ (4,153)	$ 89
Increase (Decrease) in Stockholders' Equity
Net income	84,337		84,337		84,337
Other comprehensive income (loss), net of tax	15,685		15,685			15,685
Cash dividends declared	(30,579)		(30,579)		(30,579)
Treasury shares purchased under share repurchase plan (in shares)				(289,101)
Treasury shares purchased under share repurchase plan	(10,012)		(10,012)	$ 0			(10,012)
Treasury shares purchased under deferred directors' plan (in shares)				(11,566)
Treasury shares purchased under deferred directors' plan	0		0	$ 535			(535)
Treasury shares sold and distributed under deferred directors' plan (in shares)				5,748
Treasury shares sold and distributed under deferred directors' plan	0		0	$ (119)			119
Stock activity under equity incentive plans (in shares)				90,392
Stock activity under equity incentive plans	(2,137)		(2,137)	$ (2,137)
Stock based compensation expense	1,790		1,790	$ 1,790
Balance (in shares) at Dec. 31, 2020				25,239,748
Balance at Dec. 31, 2020	657,184	$ (6,951)	657,095	$ 114,927	529,005	27,744	(14,581)	89
Increase (Decrease) in Stockholders' Equity
Net income	95,733		95,733		95,733
Other comprehensive income (loss), net of tax	(11,651)		(11,651)			(11,651)
Cash dividends declared	(34,653)		(34,653)		(34,653)
Treasury shares purchased under deferred directors' plan (in shares)				(8,820)
Treasury shares purchased under deferred directors' plan	0		0	$ 559			(559)
Treasury shares sold and distributed under deferred directors' plan (in shares)				5,664
Treasury shares sold and distributed under deferred directors' plan	0		0	$ (115)			115
Stock activity under equity incentive plans (in shares)				64,201
Stock activity under equity incentive plans	(1,914)		(1,914)	$ (1,914)
Stock based compensation expense	7,158		7,158	$ 7,158
Balance (in shares) at Dec. 31, 2021				25,300,793
Balance at Dec. 31, 2021	$ 704,906		704,817	$ 120,615	583,134	16,093	(15,025)	89
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Net income	$ 103,817		103,817		103,817
Other comprehensive income (loss), net of tax	(205,016)		(205,016)			(205,016)
Cash dividends declared	(40,851)		(40,851)		(40,851)
Treasury shares purchased under deferred directors' plan (in shares)				(7,641)
Treasury shares purchased under deferred directors' plan	0		0	$ 579			(579)
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 incentive plans (in shares)				47,518
Stock activity under equity incentive plans	(1,780)		(1,780)	$ (1,780)
Stock based compensation expense	7,811		7,811	$ 7,811
Balance (in shares) at Dec. 31, 2022				25,349,225
Balance at Dec. 31, 2022	$ 568,887		$ 568,798	$ 127,004	$ 646,100	$ (188,923)	$ (15,383)	$ 89