CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive (Loss) Income, net of tax [Member]
Balance at beginning of period at Dec. 31, 2021			$ 972,547	$ 1,427,295		$ (236,442)	$ (83,999)
Common stock repurchases (See Note 17)						(52,713)
Common stock issued stock-based compensation plan			(6,980)			6,980
Stock-based compensation			1,182
Restricted stock forfeited			22			(22)
Net income	$ 82,600			82,600
Dividends on common stock (2023 - $0.14 per share; 2022 - $0.10 per share)				(19,900)
Other comprehensive (loss) income, net of tax	(331,834)						(331,834)
Balance at end of period at Mar. 31, 2022	1,781,102	$ 22,366	966,771	1,489,995		(282,197)	(415,833)
Balance at beginning of period at Dec. 31, 2022	1,325,540		970,722	1,644,209		(506,979)	(804,778)
Balance at beginning of period (ASU 2022-02) at Dec. 31, 2022					$ (1,357)
Common stock repurchases (See Note 17)						(53,217)
Common stock issued stock-based compensation plan			(13,139)			13,139
Stock-based compensation			2,075
Restricted stock forfeited			254			(254)
Net income	70,698			70,698
Dividends on common stock (2023 - $0.14 per share; 2022 - $0.10 per share)				(25,374)
Other comprehensive (loss) income, net of tax	87,228						87,228
Balance at end of period at Mar. 31, 2023	$ 1,405,593	$ 22,366	$ 959,912	$ 1,688,176		$ (547,311)	$ (717,550)