CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Impact of the adoption of new accounting standards	Adjusted balance at beginning of period	Common Shares Outstanding	Common Shares Outstanding Adjusted balance at beginning of period	Common Stock	Common Stock Adjusted balance at beginning of period	Additional Paid-In Capital	Additional Paid-In Capital Adjusted balance at beginning of period	Retained Earnings (Accum. Deficit)	Retained Earnings (Accum. Deficit) Impact of the adoption of new accounting standards	Retained Earnings (Accum. Deficit) Adjusted balance at beginning of period	Accum. Other Comp. Income (Loss)	Accum. Other Comp. Income (Loss) Adjusted balance at beginning of period	Non- Controlling Interest	Non- Controlling Interest Adjusted balance at beginning of period
Increase (Decrease) in Shareholders' Equity
Adjusted balance (in shares)					28,289,257
Balance (in shares) at Dec. 31, 2019				28,289,257
Balance at beginning of period at Dec. 31, 2019	$ 528,520	$ (3,156)	$ 525,364			$ 447,602	$ 447,602	$ 91,611	$ 91,611	$ (19,102)	$ (3,156)	$ (22,258)	$ 8,409	$ 8,409	$ 0	$ 0
Increase (Decrease) in Shareholders' Equity
Net income	8,326									8,326
Other comprehensive loss	10,663												10,663
Cash dividends declared	(6,496)									(6,496)
Shares of common stock repurchased and other related costs (in shares)				(206,802)
Common stock repurchased and retired and other related costs	(4,749)					(4,749)
Share-based compensation (in shares)				32,898
Share-based compensation	673							673
Non-controlling interest	49														49
Balance (in shares) at Mar. 31, 2020				28,115,353
Balance at end of period at Mar. 31, 2020	533,830					442,853		92,284		(20,428)			19,072		49
Balance (in shares) at Dec. 31, 2019				28,289,257
Balance at beginning of period at Dec. 31, 2019	528,520	(3,156)	525,364			447,602	447,602	91,611	91,611	(19,102)	(3,156)	(22,258)	8,409	8,409	0	0
Increase (Decrease) in Shareholders' Equity
Net income	25,102
Other comprehensive loss	15,132												15,132
Balance (in shares) at Sep. 30, 2020				28,179,798
Balance at end of period at Sep. 30, 2020	543,942					442,635		94,336		(16,609)			23,541		39
Balance (in shares) at Dec. 31, 2019				28,289,257
Balance at beginning of period at Dec. 31, 2019	$ 528,520	$ (3,156)	$ 525,364			447,602	$ 447,602	91,611	$ 91,611	(19,102)	$ (3,156)	$ (22,258)	8,409	$ 8,409	0	$ 0
Balance (in shares) at Dec. 31, 2020	28,183,340			28,183,340
Balance at end of period at Dec. 31, 2020	$ 546,733					442,635		94,842		(10,920)			20,128		48
Increase (Decrease) in Shareholders' Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Balance (in shares) at Mar. 31, 2020				28,115,353
Balance at beginning of period at Mar. 31, 2020	$ 533,830					442,853		92,284		(20,428)			19,072		49
Increase (Decrease) in Shareholders' Equity
Net income	9,917									9,917
Other comprehensive loss	6,479												6,479
Cash dividends declared	(6,475)									(6,475)
Common stock purchased by directors' deferred compensation plan (net shares)	(154)					(154)
Common stock repurchased and retired and other related costs	0
Share-based compensation (in shares)				38,806
Share-based compensation	723							723
Non-controlling interest	(14)														(14)
Balance (in shares) at Jun. 30, 2020				28,154,159
Balance at end of period at Jun. 30, 2020	544,306					442,699		93,007		(16,986)			25,551		35
Increase (Decrease) in Shareholders' Equity
Net income	6,859									6,859
Other comprehensive loss	(2,010)												(2,010)
Cash dividends declared	(6,482)									(6,482)
Shares of common stock repurchased and other related costs (in shares)				0
Common stock repurchased and retired and other related costs	0					0
Share-based compensation (in shares)				25,639
Share-based compensation	1,329							1,329
Balance (in shares) at Sep. 30, 2020				28,179,798
Balance at end of period at Sep. 30, 2020	$ 543,942					442,635		94,336		(16,609)			23,541		39
Balance (in shares) at Dec. 31, 2020	28,183,340			28,183,340
Balance at beginning of period at Dec. 31, 2020	$ 546,733					442,635		94,842		(10,920)			20,128		48
Increase (Decrease) in Shareholders' Equity
Net income	18,038									18,038
Other comprehensive loss	(17,117)												(17,117)
Cash dividends declared	(6,490)									(6,490)
Share-based compensation (in shares)				99,190
Share-based compensation	1,749					870		879
Balance (in shares) at Mar. 31, 2021				28,282,530
Balance at end of period at Mar. 31, 2021	$ 542,913					443,505		95,721		628			3,011		48
Balance (in shares) at Dec. 31, 2020	28,183,340			28,183,340
Balance at beginning of period at Dec. 31, 2020	$ 546,733					442,635		94,842		(10,920)			20,128		48
Increase (Decrease) in Shareholders' Equity
Net income	57,567
Other comprehensive loss	$ (21,861)												(21,861)
Balance (in shares) at Sep. 30, 2021	27,999,588			27,999,588
Balance at end of period at Sep. 30, 2021	$ 555,467					436,957		97,279		22,916			(1,733)		48
Balance (in shares) at Mar. 31, 2021				28,282,530
Balance at beginning of period at Mar. 31, 2021	542,913					443,505		95,721		628			3,011		48
Increase (Decrease) in Shareholders' Equity
Net income	18,714									18,714
Other comprehensive loss	1,915												1,915
Cash dividends declared	(6,787)									(6,787)
Common stock purchased by directors' deferred compensation plan (net shares)	(191)					(191)
Shares of common stock repurchased and other related costs (in shares)				(156,600)
Common stock repurchased and retired and other related costs	(4,327)					(2,603)				(1,724)
Share-based compensation (in shares)				92,930
Share-based compensation	604					143		461
Balance (in shares) at Jun. 30, 2021				28,218,860
Balance at end of period at Jun. 30, 2021	552,841					440,854		96,182		10,831			4,926		48
Increase (Decrease) in Shareholders' Equity
Net income	20,815									20,815
Other comprehensive loss	(6,659)												(6,659)
Cash dividends declared	(6,733)									(6,733)
Common stock purchased by directors' deferred compensation plan (net shares)	(64)					(64)
Shares of common stock repurchased and other related costs (in shares)				(234,700)
Common stock repurchased and retired and other related costs	(5,894)					(3,897)				(1,997)
Share-based compensation (in shares)				15,428
Share-based compensation	1,097							1,097
Non-controlling interest	$ 4														4
Balance (in shares) at Sep. 30, 2021	27,999,588			27,999,588
Balance at end of period at Sep. 30, 2021	$ 555,467					$ 436,957		$ 97,279		$ 22,916			$ (1,733)		$ 48