Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2020	$ 39	$ 134,629	$ 2,003,576	$ (368,074)	$ (32,889)	$ (23,496)	$ 1,713,785
Net (loss) income	0	0	0	24,199	0	0	24,199
Restricted stock units granted	0	0	1,459	0	0	0	1,459
Restricted stock unit distributions	0	413	(413)	0	0	(4,525)	(4,525)
Common stock dividends declared	0	0	0	(10,715)	0	0	(10,715)
Series B Preferred Stock dividends declared	0	0	0	(276)	0	0	(276)
Common stock issued for 401(k) match	0	96	2,306	0	0	0	2,402
Common stock issued to directors	0	52	1,792	0	0	0	1,844
Common stock issued to pension plans	0	875	15,925	0	0	0	16,800
Other comprehensive income (loss)	0	0	0	0	3,452	0	3,452
Balances at Jun. 30, 2021	39	136,065	2,024,645	(354,866)	(29,437)	(28,021)	1,748,425
Balance at Mar. 31, 2021	39	135,546	2,021,072	(351,449)	(31,057)	(23,496)	1,750,655
Net (loss) income	0	0	0	2,748	0	0	2,748
Restricted stock units granted	0	0	959	0	0	0	959
Restricted stock unit distributions	0	413	(413)	0	0	(4,525)	(4,525)
Common stock dividends declared	0	0	0	(6,027)	0	0	(6,027)
Series B Preferred Stock dividends declared	0	0	0	(138)	0	0	(138)
Common stock issued for 401(k) match	0	54	1,235	0	0	0	1,289
Common stock issued to directors	0	52	1,792	0	0	0	1,844
Common stock issued to pension plans	0	0	0	0	0	0	0
Other comprehensive income (loss)	0	0	0	0	1,620	0	1,620
Balances at Jun. 30, 2021	39	136,065	2,024,645	(354,866)	(29,437)	(28,021)	1,748,425
Balance at Dec. 31, 2021	39	136,391	2,034,485	(353,651)	(28,456)	(28,021)	1,760,787
Net (loss) income	0	0	0	(9,370)	0	0	(9,370)
Restricted stock units granted	0	0	2,108	0	0	0	2,108
Restricted stock unit distributions	0	447	(447)	0	0	(3,677)	(3,677)
Common stock dividends declared	0	0	0	(6,751)	0	0	(6,751)
Series B Preferred Stock dividends declared	0	0	0	(276)	0	0	(276)
Common stock issued for 401(k) match	0	80	1,811	0	0	0	1,891
Common stock issued to directors	0	25	392	0	0	0	417
Common stock issued to pension plans	0	298	5,272	0	0	0	5,570
Other comprehensive income (loss)	0	0	0	0	32,183	0	32,183
Balances at Jun. 30, 2022	39	137,241	2,043,621	(370,048)	3,727	(31,698)	1,782,882
Balance at Mar. 31, 2022	39	136,657	2,036,417	(353,007)	(61,621)	(29,942)	1,728,543
Net (loss) income	0	0	0	(13,523)	0	0	(13,523)
Restricted stock units granted	0	0	837	0	0	0	837
Restricted stock unit distributions	0	225	(225)	0	0	(1,756)	(1,756)
Common stock dividends declared	0	0	0	(3,380)	0	0	(3,380)
Series B Preferred Stock dividends declared	0	0	0	(138)	0	0	(138)
Common stock issued for 401(k) match	0	36	928	0	0	0	964
Common stock issued to directors	0	25	392	0	0	0	417
Common stock issued to pension plans	0	298	5,272	0	0	0	5,570
Other comprehensive income (loss)	0	0	0	0	65,348	0	65,348
Balances at Jun. 30, 2022	$ 39	$ 137,241	$ 2,043,621	$ (370,048)	$ 3,727	$ (31,698)	$ 1,782,882