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)			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	$ 47,331			47,331				47,331
Net current period other comprehensive income (loss)	(5,473)					(5,473)		(5,473)
Cash dividends declared and paid	(17,322)			(17,322)				(17,322)
Treasury shares purchased under deferred directors' plan (in shares)			(4,576)
Treasury shares purchased under deferred directors' plan	0		$ 282				(282)
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)			49,130
Stock activity under equity compensation plans	(1,648)		$ (1,648)					(1,648)
Stock based compensation expense	4,350		4,350					4,350
Ending balance at Jun. 30, 2021	677,471		$ 117,796	552,063		22,271	(14,748)	677,382		89
Beginning balance (in shares)			25,290,908
Beginning balance at Mar. 31, 2021	651,668		$ 114,764	536,390		15,110	(14,685)	651,579		89
Net income	24,348			24,348				24,348
Net current period other comprehensive income (loss)	7,161					7,161		7,161
Cash dividends declared and paid	(8,675)			(8,675)				(8,675)
Treasury shares purchased under deferred directors' plan (in shares)			(942)
Treasury shares purchased under deferred directors' plan	0		$ 63				(63)
Stock based compensation expense	2,969		2,969					2,969
Ending balance at Jun. 30, 2021	$ 677,471		$ 117,796	552,063		22,271	(14,748)	677,382		89
Beginning balance (in shares)			25,289,966
Beginning balance (in shares)	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	49,315			49,315				49,315
Net current period other comprehensive income (loss)	(174,627)					(174,627)		(174,627)
Cash dividends declared and paid	(20,423)			(20,423)				(20,423)
Treasury shares purchased under deferred directors' plan (in shares)			(3,574)
Treasury shares purchased under deferred directors' plan	0		$ 285				(285)
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)			39,388
Stock activity under equity compensation plans	(1,728)		$ (1,728)					(1,728)
Stock based compensation expense	4,620		4,620					4,620
Ending balance at Jun. 30, 2022	562,063		$ 123,571	612,026		(158,534)	(15,089)	561,974		89
Beginning balance (in shares)			25,346,149
Beginning balance at Mar. 31, 2022	609,102		$ 121,138	596,578		(93,687)	(15,016)	609,013		89
Net income	25,673			25,673				25,673
Net current period other comprehensive income (loss)	(64,847)					(64,847)		(64,847)
Cash dividends declared and paid	(10,225)			(10,225)				(10,225)
Treasury shares purchased under deferred directors' plan (in shares)			(987)
Treasury shares purchased under deferred directors' plan	0		$ 73				(73)
Stock based compensation expense	2,360		2,360					2,360
Ending balance at Jun. 30, 2022	$ 562,063		$ 123,571	$ 612,026		$ (158,534)	$ (15,089)	$ 561,974		$ 89
Beginning balance (in shares)	25,345,162		25,345,162