CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income		$ 110,343	$ 21,040	$ 98,234
Other Comprehensive Income (Loss), Before Tax:
Net change in unrealized (losses) gains on debt securities available-for-sale		(23,972)	22,683	15,793
Net available-for-sale securities losses reclassified into earnings	[1]	0	0	26
Adjustment to funded status of employee benefit plans		3,561	3,549	(1,282)
Other Comprehensive (Loss) Income, Before Tax		(20,411)	26,232	14,537
Income tax benefit (expense) related to items of other comprehensive income		4,350	(5,591)	(3,100)
Other Comprehensive (Loss) Income, After Tax		(16,061)	20,641	11,437
Comprehensive Income		$ 94,282	$ 41,681	$ 109,671

[1] Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Net Income as follows: the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.