Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
NET INCOME		$ 15,951	$ 15,575	$ 31,795	$ 30,131
Other comprehensive (loss) income:
Net unrealized holding (losses) gains on available for sale securities		(105,497)	8,698	(217,894)	(6,236)
Reclassification adjustment for losses (gains) realized in income	[1]	31	(1)	31	(384)
Net unrealized holding (losses) gains		(105,466)	8,697	(217,863)	(6,620)
Income tax effect		22,148	(1,825)	45,751	1,392
Unrealized holding (losses) gains, net of reclassification and tax		(83,318)	6,872	(172,112)	(5,228)
Change in funded status of post-retirement plan, net of tax		(2)	0	(3)	0
Other comprehensive (loss) gain, net of tax		(83,320)	6,872	(172,115)	(5,228)
TOTAL COMPREHENSIVE (LOSS) INCOME		$ (67,369)	$ 22,447	$ (140,320)	$ 24,903

[1] Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.