CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Impact of ASC 326 Adoption	Common Stock	Retained Earnings	Retained Earnings Impact of ASC 326 Adoption	Total	Treasury Stock	Total Stockholders' Equity	Total Stockholders' Equity Impact of ASC 326 Adoption	Noncontrolling Interest
Balance at Dec. 31, 2018	$ 521,704	$ (1,327)	$ 112,383	$ 419,179	$ (1,327)	$ (6,191)	$ (3,756)	$ 521,615	$ (1,327)	$ 89
Balance (in shares) at Dec. 31, 2018			25,128,773
Increase (Decrease) in Stockholders' Equity
Net income	87,047			87,047				87,047
Other comprehensive income (loss), net of tax	18,250					18,250		18,250
Cash dividends declared	(29,652)			(29,652)				(29,652)
Cashless exercise of warrants (in shares)			224,066
Treasury shares purchased under deferred directors' plan	0		$ 515				(515)
Treasury shares purchased under deferred directors' plan (in shares)			(11,481)
Treasury shares sold and distributed under deferred directors' plan	0		$ (118)				118
Treasury shares sold and distributed under deferred directors' plan (in shares)			5,699
Stock activity under equity compensation plans	(2,109)		$ (2,109)					(2,109)
Stock activity under equity compensation plans (in shares)			97,218
Stock based compensation expense	4,187		$ 4,187					4,187
Balance at Dec. 31, 2019	$ 598,100		$ 114,858	475,247		12,059	(4,153)	598,011		89
Balance (in shares) at Dec. 31, 2019			25,444,275
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2017-08 [Member]
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	(10,012)						(10,012)	(10,012)
Treasury shares purchased under share repurchase plan (in shares)			(289,101)
Treasury shares purchased under deferred directors' plan	0		$ 535				(535)
Treasury shares purchased under deferred directors' plan (in shares)			(11,566)
Treasury shares sold and distributed under deferred directors' plan	0		$ (119)				119
Treasury shares sold and distributed under deferred directors' plan (in shares)			5,748
Stock activity under equity compensation plans	(2,137)		$ (2,137)					(2,137)
Stock activity under equity compensation plans (in shares)			90,392
Stock based compensation expense	1,790		$ 1,790					1,790
Balance at Dec. 31, 2020	657,184	$ (6,951)	$ 114,927	529,005		27,744	(14,581)	657,095		89
Balance (in shares) at Dec. 31, 2020			25,239,748
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	0		$ 559				(559)
Treasury shares purchased under deferred directors' plan (in shares)			(8,820)
Treasury shares sold and distributed under deferred directors' plan	0		$ (115)				115
Treasury shares sold and distributed under deferred directors' plan (in shares)			5,664
Stock activity under equity compensation plans	(1,914)		$ (1,914)					(1,914)
Stock activity under equity compensation plans (in shares)			64,201
Stock based compensation expense	7,158		$ 7,158					7,158
Balance at Dec. 31, 2021	$ 704,906		$ 120,615	$ 583,134		$ 16,093	$ (15,025)	$ 704,817		$ 89
Balance (in shares) at Dec. 31, 2021			25,300,793
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible Enumeration]	ASU 2016-13