CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Impact of adopting ASC 326	Common Stock	Retained Earnings	Retained Earnings Impact of adopting ASC 326	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total Stockholders’ Equity	Total Stockholders’ Equity Impact of adopting ASC 326	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2020			25,239,748
Beginning balance at Dec. 31, 2020	$ 657,184	$ (6,951)	$ 114,927	$ 529,005	$ (6,951)	$ 27,744	$ (14,581)	$ 657,095	$ (6,951)	$ 89
Accounting standards update	ASU 2016-13
Net income	$ 71,450			71,450				71,450
Other comprehensive income (loss), net of tax	(16,812)					(16,812)		(16,812)
Cash dividends declared and paid	(25,986)			(25,986)				(25,986)
Treasury shares purchased under deferred directors' plan (in shares)			(7,959)
Treasury shares purchased under deferred directors' plan	0		$ 496				(496)
Treasury shares sold and distributed under deferred directors' plan (in shares)			5,664
Treasury shares sold and distributed under deferred directors' plan	0		$ (115)				115
Stock activity under equity compensation plans (in shares)			61,725
Stock activity under equity compensation plans	(1,818)		$ (1,818)					(1,818)
Stock based compensation expense	6,135		$ 6,135					6,135
Ending balance (in shares) at Sep. 30, 2021			25,299,178
Ending balance at Sep. 30, 2021	683,202		$ 119,625	567,518		10,932	(14,962)	683,113		89
Beginning balance (in shares) at Jun. 30, 2021			25,289,966
Beginning balance at Jun. 30, 2021	677,471		$ 117,796	552,063		22,271	(14,748)	677,382		89
Net income	24,119			24,119				24,119
Other comprehensive income (loss), net of tax	(11,339)					(11,339)		(11,339)
Cash dividends declared and paid	(8,664)			(8,664)				(8,664)
Treasury shares purchased under deferred directors' plan (in shares)			(3,383)
Treasury shares purchased under deferred directors' plan	0		$ 214				(214)
Stock activity under equity compensation plans (in shares)			12,595
Stock activity under equity compensation plans	(170)		$ (170)					(170)
Stock based compensation expense	1,785		$ 1,785					1,785
Ending balance (in shares) at Sep. 30, 2021			25,299,178
Ending balance at Sep. 30, 2021	$ 683,202		$ 119,625	567,518		10,932	(14,962)	683,113		89
Beginning balance (in shares) at Dec. 31, 2021	25,300,793		25,300,793
Beginning balance at Dec. 31, 2021	$ 704,906		$ 120,615	583,134		16,093	(15,025)	704,817		89
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		$ 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		$ (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		25,350,134
Ending balance at Sep. 30, 2022	$ 519,220		$ 125,832	630,337		(221,729)	(15,309)	519,131		89
Beginning balance (in shares) at Jun. 30, 2022			25,345,162
Beginning balance at Jun. 30, 2022	562,063		$ 123,571	612,026		(158,534)	(15,089)	561,974		89
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		$ 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		25,350,134
Ending balance at Sep. 30, 2022	$ 519,220		$ 125,832	$ 630,337		$ (221,729)	$ (15,309)	$ 519,131		$ 89