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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect of Change in Accounting Principles (See Note 2 - Recent Accounting Pronouncements)	Balance, January 1, 2020	Common Stock	Common Stock Balance, January 1, 2020	Additional Paid-in Capital	Additional Paid-in Capital Balance, January 1, 2020	Retained Earnings	Retained Earnings Cumulative Effect of Change in Accounting Principles (See Note 2 - Recent Accounting Pronouncements)	Retained Earnings Balance, January 1, 2020	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Balance, January 1, 2020
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Beginning Balances at Dec. 31, 2019	$ 573,820	$ (6,717)	$ 567,103	$ 26,671	$ 26,671	$ 278,954	$ 278,954	$ 253,090	$ (6,717)	$ 246,373	$ 15,105	$ 15,105
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	12,472							12,472
Other Comprehensive Income (Loss)	13,255										13,255
Cash Dividends	(5,065)							(5,065)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				41,752
Restricted Share Grants	270			$ 42		228
Stock Repurchase (in shares)				(173,089)
Stock Repurchase	(4,495)			$ (173)		(4,322)
Ending Balances (in shares) at Mar. 31, 2020				26,540,031
Ending Balances at Mar. 31, 2020	583,540			$ 26,540		274,860		253,780			28,360
Beginning Balances (in shares) at Dec. 31, 2019				26,671,368	26,671,368
Beginning Balances at Dec. 31, 2019	573,820	$ (6,717)	$ 567,103	$ 26,671	$ 26,671	278,954	$ 278,954	253,090	$ (6,717)	$ 246,373	15,105	$ 15,105
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	41,320
Other Comprehensive Income (Loss)	15,638
Ending Balances (in shares) at Sep. 30, 2020				26,492,866
Ending Balances at Sep. 30, 2020	603,981			$ 26,493		274,166		272,579			30,743
Beginning Balances (in shares) at Mar. 31, 2020				26,540,031
Beginning Balances at Mar. 31, 2020	583,540			$ 26,540		274,860		253,780			28,360
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	14,255							14,255
Other Comprehensive Income (Loss)	2,789										2,789
Cash Dividends	(5,024)							(5,024)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				1,426
Restricted Share Grants	282			$ 1		281
Stock Repurchase (in shares)				(44,166)
Stock Repurchase	(1,168)			$ (44)		(1,124)
Ending Balances (in shares) at Jun. 30, 2020				26,497,291
Ending Balances at Jun. 30, 2020	594,674			$ 26,497		274,017		263,011			31,149
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	14,593							14,593
Other Comprehensive Income (Loss)	(406)										(406)
Cash Dividends	(5,025)							(5,025)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				(378)
Restricted Share Grants	254					254
Stock Repurchase (in shares)				(4,047)
Stock Repurchase	(109)			$ (4)		(105)
Ending Balances (in shares) at Sep. 30, 2020				26,492,866
Ending Balances at Sep. 30, 2020	603,981			$ 26,493		274,166		272,579			30,743
Beginning Balances (in shares) at Dec. 31, 2020				26,502,157
Beginning Balances at Dec. 31, 2020	624,709			$ 26,502		274,385		288,447			35,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	19,557							19,557
Other Comprehensive Income (Loss)	(21,828)										(21,828)
Cash Dividends	(5,554)							(5,554)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				44,123
Restricted Share Grants	329			$ 44		285
Ending Balances (in shares) at Mar. 31, 2021				26,546,280
Ending Balances at Mar. 31, 2021	617,213			$ 26,546		274,670		302,450			13,547
Beginning Balances (in shares) at Dec. 31, 2020				26,502,157
Beginning Balances at Dec. 31, 2020	624,709			$ 26,502		274,385		288,447			35,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	64,865
Other Comprehensive Income (Loss)	(24,111)
Ending Balances (in shares) at Sep. 30, 2021				26,546,100
Ending Balances at Sep. 30, 2021	650,139			$ 26,546		275,682		336,647			11,264
Beginning Balances (in shares) at Mar. 31, 2021				26,546,280
Beginning Balances at Mar. 31, 2021	617,213			$ 26,546		274,670		302,450			13,547
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	23,822							23,822
Other Comprehensive Income (Loss)	12,878										12,878
Cash Dividends	(5,555)							(5,555)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				(576)
Restricted Share Grants	639					639
Ending Balances (in shares) at Jun. 30, 2021				26,545,704
Ending Balances at Jun. 30, 2021	648,997			$ 26,546		275,309		320,717			26,425
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	21,486							21,486
Other Comprehensive Income (Loss)	(15,161)										(15,161)
Cash Dividends	(5,556)							(5,556)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				396
Restricted Share Grants	373					373
Ending Balances (in shares) at Sep. 30, 2021				26,546,100
Ending Balances at Sep. 30, 2021	$ 650,139			$ 26,546		$ 275,682		$ 336,647			$ 11,264